diff --git a/agent/alpine/Dockerfile b/agent/alpine/Dockerfile
index 0ad574f48..dfa93ad62 100644
--- a/agent/alpine/Dockerfile
+++ b/agent/alpine/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=agent
 
-RUN apk update && \
+RUN set -eux && \
+    apk update && \
     apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             alpine-sdk \
             autoconf \
@@ -73,7 +74,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_get/zabbix_get /usr/bi
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_sender/zabbix_sender /usr/bin/zabbix_sender
 COPY --from=builder  /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_agentd.conf /etc/zabbix/zabbix_agentd.conf
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -85,7 +87,7 @@ RUN addgroup zabbix && \
     mkdir -p /var/lib/zabbix/modules && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     apk update && \
-    apk add ${APK_FLAGS_PERSISTANT} \
+    apk add ${APK_FLAGS_PERSISTENT} \
             tini \
             bash \
             coreutils \
diff --git a/agent/alpine/README.md b/agent/alpine/README.md
index 35966d4b8..71ba2c214 100644
--- a/agent/alpine/README.md
+++ b/agent/alpine/README.md
@@ -161,7 +161,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_agentd.conf`` configuration file. For example, ``ZBX_REFRESHACTIVECHECKS`` = ``RefreshActiveChecks``.
 
-Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_agentd) to get more information about the variables.
+Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_agentd) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix agent container
 
diff --git a/agent/centos/Dockerfile b/agent/centos/Dockerfile
index 8a42f496a..d388b7477 100644
--- a/agent/centos/Dockerfile
+++ b/agent/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=agent
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -75,7 +76,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_sender/zabbix_sender /
 COPY --from=builder  /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_agentd.conf /etc/zabbix/zabbix_agentd.conf
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/agent/centos/README.md b/agent/centos/README.md
index 35966d4b8..71ba2c214 100644
--- a/agent/centos/README.md
+++ b/agent/centos/README.md
@@ -161,7 +161,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_agentd.conf`` configuration file. For example, ``ZBX_REFRESHACTIVECHECKS`` = ``RefreshActiveChecks``.
 
-Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_agentd) to get more information about the variables.
+Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_agentd) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix agent container
 
diff --git a/agent/ubuntu/Dockerfile b/agent/ubuntu/Dockerfile
index 4dcc04313..9875aa8b0 100644
--- a/agent/ubuntu/Dockerfile
+++ b/agent/ubuntu/Dockerfile
@@ -9,8 +9,9 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_ALL=en_US.UTF-8 TERM=xterm \
     ZBX_TYPE=agent ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES}
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
-    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
+    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install locales && \
     locale-gen $LC_ALL && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
@@ -80,7 +81,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_sender/zabbix_sender /
 COPY --from=builder  /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_agentd.conf /etc/zabbix/zabbix_agentd.conf
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
diff --git a/agent/ubuntu/README.md b/agent/ubuntu/README.md
index 35966d4b8..71ba2c214 100644
--- a/agent/ubuntu/README.md
+++ b/agent/ubuntu/README.md
@@ -161,7 +161,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_agentd.conf`` configuration file. For example, ``ZBX_REFRESHACTIVECHECKS`` = ``RefreshActiveChecks``.
 
-Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_agentd) to get more information about the variables.
+Please use official documentation for [``zabbix_agentd.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_agentd) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix agent container
 
diff --git a/java-gateway/alpine/Dockerfile b/java-gateway/alpine/Dockerfile
index 738f36bd6..a7826cbb3 100644
--- a/java-gateway/alpine/Dockerfile
+++ b/java-gateway/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -44,7 +45,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE} --link zabbix-server:zabbix-server -p 10052:10052 -d zabbix-${ZBX_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             autoconf \
             automake \
             coreutils \
diff --git a/java-gateway/centos/Dockerfile b/java-gateway/centos/Dockerfile
index 646afb44f..11bf2d49e 100644
--- a/java-gateway/centos/Dockerfile
+++ b/java-gateway/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=java-gateway
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum ${YUM_FLAGS_COMMON} makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -67,7 +68,8 @@ STOPSIGNAL SIGTERM
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_java/bin/* /usr/sbin/zabbix_java/bin/
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_java/lib/* /usr/sbin/zabbix_java/lib/
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser --system --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/java-gateway/ubuntu/Dockerfile b/java-gateway/ubuntu/Dockerfile
index 6b3f4a237..ab165ea65 100644
--- a/java-gateway/ubuntu/Dockerfile
+++ b/java-gateway/ubuntu/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -51,7 +52,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE} --link zabbix-server:zabbix-server -p 10052:10052 -d zabbix-${ZBX_TYPE}:ubuntu-${ZBX_VERSION}"
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
             automake \
diff --git a/proxy-mysql/alpine/Dockerfile b/proxy-mysql/alpine/Dockerfile
index 1e53b24ba..523063120 100644
--- a/proxy-mysql/alpine/Dockerfile
+++ b/proxy-mysql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -67,7 +68,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql --link zabbix-server:zabbix-server -p 10051:10051 -d zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             autoconf \
             automake \
             coreutils \
@@ -120,8 +122,7 @@ RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
     rm -rf /tmp/zabbix-${ZBX_VERSION}/ && \
     apk del ${APK_FLAGS_COMMON} --purge \
             build-dependencies && \
-    rm -rf /var/cache/apk/* && \
-    rm -rf /root/.subversion
+    rm -rf /var/cache/apk/*
 
 EXPOSE 10051/TCP
 
diff --git a/proxy-mysql/alpine/README.md b/proxy-mysql/alpine/README.md
index 4f7071cf8..cdf542791 100644
--- a/proxy-mysql/alpine/README.md
+++ b/proxy-mysql/alpine/README.md
@@ -189,7 +189,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/proxy-mysql/centos/Dockerfile b/proxy-mysql/centos/Dockerfile
index 708794268..4378be4f3 100644
--- a/proxy-mysql/centos/Dockerfile
+++ b/proxy-mysql/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=proxy ZBX_DB_TYPE=mysql
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -93,7 +94,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_${ZBX_TYPE}.conf /etc
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/database/${ZBX_DB_TYPE}/create.sql.gz /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}/create.sql.gz
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
@@ -113,7 +115,7 @@ RUN groupadd --system zabbix && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     mkdir -p /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} && \
     yum ${YUM_FLAGS_COMMON} makecache && \
-    yum ${YUM_FLAGS_PERSISTENT} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm && \
+    yum ${YUM_FLAGS_PERSISTENT} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm && \
     yum ${YUM_FLAGS_PERSISTENT} install \
             libcurl \
             libxml2 \
@@ -124,7 +126,7 @@ RUN groupadd --system zabbix && \
             openssl-libs \
             pcre \
             unixODBC && \
-    yum ${YUM_FLAGS_PERSISTANT} clean all && \
+    yum ${YUM_FLAGS_PERSISTENT} clean all && \
     rm -rf /var/cache/yum/ && \
     chmod +x /sbin/tini
 
diff --git a/proxy-mysql/centos/README.md b/proxy-mysql/centos/README.md
index 4f7071cf8..cdf542791 100644
--- a/proxy-mysql/centos/README.md
+++ b/proxy-mysql/centos/README.md
@@ -189,7 +189,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/proxy-mysql/ubuntu/Dockerfile b/proxy-mysql/ubuntu/Dockerfile
index 5d9339c1c..7254078cd 100644
--- a/proxy-mysql/ubuntu/Dockerfile
+++ b/proxy-mysql/ubuntu/Dockerfile
@@ -24,7 +24,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -78,7 +79,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
 
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
             automake \
diff --git a/proxy-mysql/ubuntu/README.md b/proxy-mysql/ubuntu/README.md
index 4f7071cf8..cdf542791 100644
--- a/proxy-mysql/ubuntu/README.md
+++ b/proxy-mysql/ubuntu/README.md
@@ -189,7 +189,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/proxy-sqlite3/alpine/Dockerfile b/proxy-sqlite3/alpine/Dockerfile
index 363c6b039..3deac6bbe 100644
--- a/proxy-sqlite3/alpine/Dockerfile
+++ b/proxy-sqlite3/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -65,7 +66,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} --link zabbix-server:zabbix-server -p 10051:10051 -d zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             alpine-sdk \
             autoconf \
             automake \
diff --git a/proxy-sqlite3/alpine/README.md b/proxy-sqlite3/alpine/README.md
index 932200637..dad6342eb 100644
--- a/proxy-sqlite3/alpine/README.md
+++ b/proxy-sqlite3/alpine/README.md
@@ -169,7 +169,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/proxy-sqlite3/centos/Dockerfile b/proxy-sqlite3/centos/Dockerfile
index 636135356..d43faf25f 100644
--- a/proxy-sqlite3/centos/Dockerfile
+++ b/proxy-sqlite3/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=proxy ZBX_DB_TYPE=sqlite3
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -93,7 +94,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_${ZBX_TYPE}.conf /etc
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/database/${ZBX_DB_TYPE}/create.sql.gz /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}/create.sql.gz
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
@@ -113,7 +115,7 @@ RUN groupadd --system zabbix && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     mkdir -p /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} && \
     yum ${YUM_FLAGS_COMMON} makecache && \
-    yum ${YUM_FLAGS_PERSISTENT} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm && \
+    yum ${YUM_FLAGS_PERSISTENT} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm && \
     yum ${YUM_FLAGS_PERSISTENT} install \
             libcurl \
             libxml2 \
diff --git a/proxy-sqlite3/centos/README.md b/proxy-sqlite3/centos/README.md
index 932200637..dad6342eb 100644
--- a/proxy-sqlite3/centos/README.md
+++ b/proxy-sqlite3/centos/README.md
@@ -169,7 +169,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/proxy-sqlite3/ubuntu/Dockerfile b/proxy-sqlite3/ubuntu/Dockerfile
index c8e3f590b..852f893bf 100644
--- a/proxy-sqlite3/ubuntu/Dockerfile
+++ b/proxy-sqlite3/ubuntu/Dockerfile
@@ -23,7 +23,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -75,7 +76,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
 
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
             automake \
diff --git a/proxy-sqlite3/ubuntu/README.md b/proxy-sqlite3/ubuntu/README.md
index 932200637..dad6342eb 100644
--- a/proxy-sqlite3/ubuntu/README.md
+++ b/proxy-sqlite3/ubuntu/README.md
@@ -169,7 +169,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_proxy.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_proxy) to get more information about the variables.
+Please use official documentation for [``zabbix_proxy.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix proxy container
 
diff --git a/server-mysql/alpine/Dockerfile b/server-mysql/alpine/Dockerfile
index 0fa400d43..f505c0a3e 100644
--- a/server-mysql/alpine/Dockerfile
+++ b/server-mysql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -69,7 +70,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql -p 10051:10051 -d zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             alpine-sdk \
             autoconf \
             automake \
diff --git a/server-mysql/alpine/README.md b/server-mysql/alpine/README.md
index 25b4c0395..1e14e44cd 100644
--- a/server-mysql/alpine/README.md
+++ b/server-mysql/alpine/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/server-mysql/centos/Dockerfile b/server-mysql/centos/Dockerfile
index ce5934246..f1661987b 100644
--- a/server-mysql/centos/Dockerfile
+++ b/server-mysql/centos/Dockerfile
@@ -9,9 +9,10 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=server ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=none
 
-RUN yum --quiet makecache && \
-    yum ${YUM_FLAGS_DEV} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
-                                 http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
+RUN set -eux && \
+    yum --quiet makecache && \
+    yum ${YUM_FLAGS_DEV} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
+                                 https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -98,7 +99,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_${ZBX_TYPE}.conf /etc
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/database/${ZBX_DB_TYPE}/create.sql.gz /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}/create.sql.gz
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix -G dialout \
             -d /var/lib/zabbix/ \
@@ -119,8 +121,8 @@ RUN groupadd --system zabbix && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     mkdir -p /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} && \
     yum ${YUM_FLAGS_COMMON} makecache && \
-    yum ${YUM_FLAGS_PERSISTENT} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
-                                        http://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
+    yum ${YUM_FLAGS_PERSISTENT} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
+                                        https://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
     yum ${YUM_FLAGS_PERSISTENT} install \
             iputils \
             traceroute \
diff --git a/server-mysql/centos/README.md b/server-mysql/centos/README.md
index 25b4c0395..1e14e44cd 100644
--- a/server-mysql/centos/README.md
+++ b/server-mysql/centos/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/server-mysql/ubuntu/Dockerfile b/server-mysql/ubuntu/Dockerfile
index b13b625a1..73116860e 100644
--- a/server-mysql/ubuntu/Dockerfile
+++ b/server-mysql/ubuntu/Dockerfile
@@ -23,7 +23,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -82,7 +83,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
 
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
             automake \
diff --git a/server-mysql/ubuntu/README.md b/server-mysql/ubuntu/README.md
index 25b4c0395..1e14e44cd 100644
--- a/server-mysql/ubuntu/README.md
+++ b/server-mysql/ubuntu/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/server-pgsql/alpine/Dockerfile b/server-pgsql/alpine/Dockerfile
index e6b1218d9..a1aaf4512 100644
--- a/server-pgsql/alpine/Dockerfile
+++ b/server-pgsql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -69,7 +70,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-${ZBX_TYPE}-pgsql --link postgres-server:postgres -p 10051:10051 -d zabbix-${ZBX_TYPE}-pgsql:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             alpine-sdk \
             autoconf \
             automake \
diff --git a/server-pgsql/alpine/README.md b/server-pgsql/alpine/README.md
index d3550e2c5..9a7238f68 100644
--- a/server-pgsql/alpine/README.md
+++ b/server-pgsql/alpine/README.md
@@ -156,7 +156,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/server-pgsql/centos/Dockerfile b/server-pgsql/centos/Dockerfile
index ef83202ac..51473661c 100644
--- a/server-pgsql/centos/Dockerfile
+++ b/server-pgsql/centos/Dockerfile
@@ -9,9 +9,10 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=server ZBX_DB_TYPE=postgresql ZBX_OPT_TYPE=none
 
-RUN yum --quiet makecache && \
-    yum ${YUM_FLAGS_DEV} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
-                                 http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
+RUN set -eux && \
+    yum --quiet makecache && \
+    yum ${YUM_FLAGS_DEV} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
+                                 https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -98,7 +99,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/conf/zabbix_${ZBX_TYPE}.conf /etc
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/database/${ZBX_DB_TYPE}/create.sql.gz /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}/create.sql.gz
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix -G dialout \
             -d /var/lib/zabbix/ \
@@ -119,8 +121,8 @@ RUN groupadd --system zabbix && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     mkdir -p /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE} && \
     yum ${YUM_FLAGS_COMMON} makecache && \
-    yum ${YUM_FLAGS_PERSISTENT} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
-                                        http://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
+    yum ${YUM_FLAGS_PERSISTENT} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
+                                        https://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
     yum ${YUM_FLAGS_PERSISTENT} install \
             iputils \
             traceroute \
diff --git a/server-pgsql/centos/README.md b/server-pgsql/centos/README.md
index d3550e2c5..9a7238f68 100644
--- a/server-pgsql/centos/README.md
+++ b/server-pgsql/centos/README.md
@@ -156,7 +156,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/server-pgsql/ubuntu/Dockerfile b/server-pgsql/ubuntu/Dockerfile
index e5e6fe35a..412594fbc 100644
--- a/server-pgsql/ubuntu/Dockerfile
+++ b/server-pgsql/ubuntu/Dockerfile
@@ -23,7 +23,8 @@ LABEL org.label-schema.name="zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -82,7 +83,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
 
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             autoconf \
             automake \
diff --git a/server-pgsql/ubuntu/README.md b/server-pgsql/ubuntu/README.md
index d3550e2c5..9a7238f68 100644
--- a/server-pgsql/ubuntu/README.md
+++ b/server-pgsql/ubuntu/README.md
@@ -156,7 +156,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/snmptraps/alpine/Dockerfile b/snmptraps/alpine/Dockerfile
index 903d5997d..2074673e5 100644
--- a/snmptraps/alpine/Dockerfile
+++ b/snmptraps/alpine/Dockerfile
@@ -32,7 +32,8 @@ STOPSIGNAL SIGTERM
 
 COPY ["snmptrapfmt_1.14+nmu1ubuntu2.tar.gz", "/tmp/"]
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
diff --git a/snmptraps/centos/Dockerfile b/snmptraps/centos/Dockerfile
index 5406aab69..271042055 100644
--- a/snmptraps/centos/Dockerfile
+++ b/snmptraps/centos/Dockerfile
@@ -10,7 +10,8 @@ ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES}
 
 COPY ["snmptrapfmt_1.14+nmu1ubuntu2.tar.gz", "/tmp/"]
 
-RUN yum ${YUM_FLAGS_COMMON} makecache && \
+RUN set -eux && \
+    yum ${YUM_FLAGS_COMMON} makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
             automake \
@@ -59,7 +60,8 @@ COPY --from=builder /tmp/snmptrapfmt-1.14+nmu1ubuntu1/snmptrapfmthdlr /usr/sbin/
 COPY --from=builder /tmp/snmptrapfmt-1.14+nmu1ubuntu1/snmptrapfmt /usr/sbin/snmptrapfmt
 COPY --from=builder /tmp/snmptrapfmt-1.14+nmu1ubuntu1/snmptrapfmt.conf /etc/snmp/snmptrapfmt.conf
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/snmptraps/ubuntu/Dockerfile b/snmptraps/ubuntu/Dockerfile
index 1015940eb..04d134f92 100644
--- a/snmptraps/ubuntu/Dockerfile
+++ b/snmptraps/ubuntu/Dockerfile
@@ -33,7 +33,8 @@ STOPSIGNAL SIGTERM
 
 COPY ["snmptrapfmt_1.14+nmu1ubuntu2_amd64.deb", "/tmp/"]
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
diff --git a/web-apache-mysql/alpine/Dockerfile b/web-apache-mysql/alpine/Dockerfile
index d372c9b4a..cc6b57139 100644
--- a/web-apache-mysql/alpine/Dockerfile
+++ b/web-apache-mysql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -64,7 +65,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             gettext \
             git && \
     cd /usr/share/ && \
diff --git a/web-apache-mysql/centos/Dockerfile b/web-apache-mysql/centos/Dockerfile
index 27a12cfe6..be85ffb0f 100644
--- a/web-apache-mysql/centos/Dockerfile
+++ b/web-apache-mysql/centos/Dockerfile
@@ -8,7 +8,8 @@ ARG ZBX_VERSION=${MAJOR_VERSION}.28
 ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES}
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             gettext \
             git && \
@@ -54,7 +55,8 @@ STOPSIGNAL SIGTERM
 
 COPY --from=builder /tmp/zabbix/ /usr/share/zabbix/
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
@@ -79,7 +81,7 @@ RUN groupadd --system zabbix && \
     cat /usr/share/zabbix/include/locales.inc.php | grep display | grep true | awk '{$1=$1};1' | \
                 cut -d"'" -f 2 | sort | \
                 xargs -I '{}' bash -c 'echo "{}" && localedef -c -i {} -f UTF-8 {}.UTF-8 2>/dev/null' && \
-    yum ${YUM_FLAGS_PERSISTANT} clean all && \
+    yum ${YUM_FLAGS_PERSISTENT} clean all && \
     rm -rf /var/cache/yum/
 
 EXPOSE 80/TCP 443/TCP
diff --git a/web-apache-mysql/ubuntu/Dockerfile b/web-apache-mysql/ubuntu/Dockerfile
index 99242b85d..249d5da9a 100644
--- a/web-apache-mysql/ubuntu/Dockerfile
+++ b/web-apache-mysql/ubuntu/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -62,7 +63,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}:ubuntu-${ZBX_VERSION}"
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             gettext \
             ca-certificates \
diff --git a/web-apache-pgsql/alpine/Dockerfile b/web-apache-pgsql/alpine/Dockerfile
index b88b4f7ea..9c5c9a177 100644
--- a/web-apache-pgsql/alpine/Dockerfile
+++ b/web-apache-pgsql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -63,7 +64,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-pgsql --link postgres-server:postgres --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-pgsql:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             gettext \
             git && \
     cd /usr/share/ && \
diff --git a/web-apache-pgsql/centos/Dockerfile b/web-apache-pgsql/centos/Dockerfile
index 28868fbed..9f2cd6104 100644
--- a/web-apache-pgsql/centos/Dockerfile
+++ b/web-apache-pgsql/centos/Dockerfile
@@ -8,7 +8,8 @@ ARG ZBX_VERSION=${MAJOR_VERSION}.28
 ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES}
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             gettext \
             patch \
@@ -55,7 +56,8 @@ STOPSIGNAL SIGTERM
 
 COPY --from=builder /tmp/zabbix/ /usr/share/zabbix/
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/web-apache-pgsql/ubuntu/Dockerfile b/web-apache-pgsql/ubuntu/Dockerfile
index 1d7c1a616..ad159217c 100644
--- a/web-apache-pgsql/ubuntu/Dockerfile
+++ b/web-apache-pgsql/ubuntu/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -63,9 +64,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-pgsql --link postgres-server:postgres --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-pgsql:ubuntu-${ZBX_VERSION}"
 
-COPY ["conf/tmp/font-config", "/tmp/font-config"]
-
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             gettext \
             patch \
@@ -77,14 +77,9 @@ RUN apt-get ${APT_FLAGS_COMMON} update && \
     cp -R /usr/share/zabbix-${ZBX_VERSION}/frontends/php/* /usr/share/zabbix/ && \
     rm -rf /usr/share/zabbix-${ZBX_VERSION}/ && \
     cd /usr/share/zabbix/ && \
-    patch -p3 < /tmp/font-config && \
-    rm /tmp/font-config && \
     rm -f conf/zabbix.conf.php && \
     rm -rf tests && \
-    rm /usr/share/zabbix/fonts/DejaVuSans.ttf && \
     ./locale/make_mo.sh && \
-    update-alternatives --install /usr/share/zabbix/fonts/graphfont.ttf \
-            zabbix-frontend-font /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf 10 && \
     mkdir -p /var/lib/locales/supported.d/ && \
     rm -f /var/lib/locales/supported.d/local && \
     cat /usr/share/zabbix/include/locales.inc.php | grep display | grep true | awk '{$1=$1};1' | \
diff --git a/web-nginx-mysql/alpine/Dockerfile b/web-nginx-mysql/alpine/Dockerfile
index 67d9e4f5f..40da2c863 100644
--- a/web-nginx-mysql/alpine/Dockerfile
+++ b/web-nginx-mysql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -64,7 +65,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             coreutils \
             gettext \
             git && \
diff --git a/web-nginx-mysql/centos/Dockerfile b/web-nginx-mysql/centos/Dockerfile
index 9cb4e9ac3..e49dea222 100644
--- a/web-nginx-mysql/centos/Dockerfile
+++ b/web-nginx-mysql/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=frontend ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=nginx
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             gettext \
             patch \
@@ -56,7 +57,8 @@ STOPSIGNAL SIGTERM
 
 COPY --from=builder /tmp/zabbix/ /usr/share/zabbix/
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/web-nginx-mysql/ubuntu/Dockerfile b/web-nginx-mysql/ubuntu/Dockerfile
index 4e6a36de2..74c2a746b 100644
--- a/web-nginx-mysql/ubuntu/Dockerfile
+++ b/web-nginx-mysql/ubuntu/Dockerfile
@@ -21,8 +21,9 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
     
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
-    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
+    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 ca-certificates && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
     addgroup --system --quiet zabbix && \
@@ -49,7 +50,7 @@ RUN apt-get ${APT_FLAGS_COMMON} update && \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     DISTRIB_CODENAME=$(/bin/bash -c 'source /etc/lsb-release && echo $DISTRIB_CODENAME') && \
-    echo "deb http://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
+    echo "deb https://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
     apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install \
             curl \
@@ -83,10 +84,10 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE} --link mysql-server:mysql --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}:ubuntu-${ZBX_VERSION}"
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             gettext \
-            ca-certificates \
             git && \
     cd /usr/share/ && \
     git clone ${ZBX_SOURCES} --branch ${ZBX_VERSION} --depth 1 --single-branch zabbix-${ZBX_VERSION} && \
diff --git a/web-nginx-pgsql/alpine/Dockerfile b/web-nginx-pgsql/alpine/Dockerfile
index e4ad91f99..954768950 100644
--- a/web-nginx-pgsql/alpine/Dockerfile
+++ b/web-nginx-pgsql/alpine/Dockerfile
@@ -21,7 +21,8 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-alpine" \
 
 STOPSIGNAL SIGTERM
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
@@ -63,7 +64,8 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-pgsql --link postgres-server:postgres --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-pgsql:alpine-${ZBX_VERSION}"
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             coreutils \
             gettext \
             git && \
diff --git a/web-nginx-pgsql/centos/Dockerfile b/web-nginx-pgsql/centos/Dockerfile
index 14747c64c..33114cf22 100644
--- a/web-nginx-pgsql/centos/Dockerfile
+++ b/web-nginx-pgsql/centos/Dockerfile
@@ -9,7 +9,8 @@ ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV TERM=xterm ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=frontend ZBX_DB_TYPE=postgresql ZBX_OPT_TYPE=nginx
 
-RUN yum --quiet makecache && \
+RUN set -eux && \
+    yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             gettext \
             git && \
@@ -55,7 +56,8 @@ STOPSIGNAL SIGTERM
 
 COPY --from=builder /tmp/zabbix/ /usr/share/zabbix/
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix \
             -d /var/lib/zabbix/ \
diff --git a/web-nginx-pgsql/ubuntu/Dockerfile b/web-nginx-pgsql/ubuntu/Dockerfile
index 09a587600..13fb28825 100644
--- a/web-nginx-pgsql/ubuntu/Dockerfile
+++ b/web-nginx-pgsql/ubuntu/Dockerfile
@@ -21,8 +21,9 @@ LABEL org.label-schema.name="zabbix-web-${ZBX_OPT_TYPE}-${ZBX_DB_TYPE}-ubuntu" \
 
 STOPSIGNAL SIGTERM
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
-    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
+    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 ca-certificates && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
     addgroup --system --quiet zabbix && \
@@ -49,7 +50,7 @@ RUN apt-get ${APT_FLAGS_COMMON} update && \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     DISTRIB_CODENAME=$(/bin/bash -c 'source /etc/lsb-release && echo $DISTRIB_CODENAME') && \
-    echo "deb http://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
+    echo "deb https://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
     apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install \
             curl \
@@ -83,10 +84,10 @@ LABEL org.label-schema.usage="https://www.zabbix.com/documentation/${MAJOR_VERSI
       org.label-schema.vcs-url="${ZBX_SOURCES}" \
       org.label-schema.docker.cmd="docker run --name zabbix-web-${ZBX_OPT_TYPE}-pgsql --link postgres-server:postgres --link zabbix-server:zabbix-server -p 80:80 -d zabbix-web-${ZBX_OPT_TYPE}-pgsql:ubuntu-${ZBX_VERSION}"
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install \
             gettext \
-            ca-certificates \
             git && \
     cd /usr/share/ && \
     git clone ${ZBX_SOURCES} --branch ${ZBX_VERSION} --depth 1 --single-branch zabbix-${ZBX_VERSION} && \
diff --git a/zabbix-appliance/alpine/Dockerfile b/zabbix-appliance/alpine/Dockerfile
index 5a3a01c99..9b67bbd21 100644
--- a/zabbix-appliance/alpine/Dockerfile
+++ b/zabbix-appliance/alpine/Dockerfile
@@ -11,7 +11,8 @@ ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=server ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=nginx \
     MYSQL_ALLOW_EMPTY_PASSWORD=true ZBX_ADD_SERVER=true ZBX_ADD_WEB=true DB_SERVER_HOST=localhost MYSQL_USER=zabbix ZBX_ADD_JAVA_GATEWAY=true ZBX_JAVAGATEWAY_ENABLE=true ZBX_JAVAGATEWAY=localhost
 
-RUN apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
+RUN set -eux && \
+    apk add ${APK_FLAGS_DEV} --virtual build-dependencies \
             bash \
             alpine-sdk \
             autoconf \
@@ -113,7 +114,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_java/lib/ /usr/sbin/za
 
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/frontends/php/ /usr/share/zabbix/
 
-RUN addgroup zabbix && \
+RUN set -eux && \
+    addgroup zabbix && \
     adduser -S \
             -D -G zabbix \
             -h /var/lib/zabbix/ \
diff --git a/zabbix-appliance/alpine/README.md b/zabbix-appliance/alpine/README.md
index d2f50a832..7845826ec 100644
--- a/zabbix-appliance/alpine/README.md
+++ b/zabbix-appliance/alpine/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/zabbix-appliance/centos/Dockerfile b/zabbix-appliance/centos/Dockerfile
index 8356459f4..0c7c3c33e 100644
--- a/zabbix-appliance/centos/Dockerfile
+++ b/zabbix-appliance/centos/Dockerfile
@@ -10,8 +10,9 @@ ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=server ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=nginx \
     MYSQL_ALLOW_EMPTY_PASSWORD=true ZBX_ADD_SERVER=true ZBX_ADD_WEB=true DB_SERVER_HOST=localhost MYSQL_USER=zabbix ZBX_ADD_JAVA_GATEWAY=true ZBX_JAVAGATEWAY_ENABLE=true ZBX_JAVAGATEWAY=localhost
 
-RUN yum ${YUM_FLAGS_DEV} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
-                                 http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
+RUN set -eux && \
+    yum ${YUM_FLAGS_DEV} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-devel-1.4-2.el7.centos.x86_64.rpm \
+                                 https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm && \
     yum --quiet makecache && \
     yum ${YUM_FLAGS_DEV} install \
             autoconf \
@@ -115,7 +116,8 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_java/lib/ /usr/sbin/za
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/frontends/php/ /usr/share/zabbix/
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN groupadd --system zabbix && \
+RUN set -eux && \
+    groupadd --system zabbix && \
     adduser -r --shell /sbin/nologin \
             -g zabbix -G dialout \
             -d /var/lib/zabbix/ \
@@ -136,8 +138,8 @@ RUN groupadd --system zabbix && \
     chown --quiet -R zabbix:root /var/lib/zabbix && \
     mkdir -p /usr/share/doc/zabbix-${ZBX_TYPE}-${ZBX_DB_TYPE}/ && \
     yum ${YUM_FLAGS_COMMON} makecache && \
-    yum ${YUM_FLAGS_PERSISTENT} install http://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
-                                        http://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
+    yum ${YUM_FLAGS_PERSISTENT} install https://repo.zabbix.com/non-supported/rhel/7/x86_64/iksemel-1.4-2.el7.centos.x86_64.rpm \
+                                        https://repo.zabbix.com/non-supported/rhel/7/x86_64/fping-3.10-1.el7.x86_64.rpm  && \
     yum ${YUM_FLAGS_PERSISTENT} install epel-release && \
     yum ${YUM_FLAGS_PERSISTENT} install \
             iputils \
diff --git a/zabbix-appliance/centos/README.md b/zabbix-appliance/centos/README.md
index d2f50a832..7845826ec 100644
--- a/zabbix-appliance/centos/README.md
+++ b/zabbix-appliance/centos/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/zabbix-appliance/rhel/Dockerfile b/zabbix-appliance/rhel/Dockerfile
index cc35e3c04..6924c2ac8 100644
--- a/zabbix-appliance/rhel/Dockerfile
+++ b/zabbix-appliance/rhel/Dockerfile
@@ -76,7 +76,7 @@ RUN INSTALL_PKGS="OpenIPMI-libs \
             php-mysql \
             php-xml \
             unixODBC" && \
-    rpm -ivh http://repo.zabbix.com/zabbix/${MAJOR_VERSION}/rhel/7/x86_64/zabbix-release-${MAJOR_VERSION}-2.el7.noarch.rpm && \
+    rpm -ivh https://repo.zabbix.com/zabbix/${MAJOR_VERSION}/rhel/7/x86_64/zabbix-release-${MAJOR_VERSION}-2.el7.noarch.rpm && \
     REPOLIST="rhel-7-server-rpms,rhel-7-server-optional-rpms,zabbix-non-supported,nginx" && \
     yum -y update-minimal --disablerepo "*" --enablerepo rhel-7-server-rpms --setopt=tsflags=nodocs \
       --security --sec-severity=Important --sec-severity=Critical && \
diff --git a/zabbix-appliance/rhel/README.md b/zabbix-appliance/rhel/README.md
index 877ed5625..8a171a91d 100644
--- a/zabbix-appliance/rhel/README.md
+++ b/zabbix-appliance/rhel/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container
 
diff --git a/zabbix-appliance/ubuntu/Dockerfile b/zabbix-appliance/ubuntu/Dockerfile
index 6db0b1bf0..737a0208a 100644
--- a/zabbix-appliance/ubuntu/Dockerfile
+++ b/zabbix-appliance/ubuntu/Dockerfile
@@ -12,7 +12,8 @@ ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
     ZBX_TYPE=server ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=nginx \
     MYSQL_ALLOW_EMPTY_PASSWORD=true ZBX_ADD_SERVER=true ZBX_ADD_WEB=true DB_SERVER_HOST=localhost MYSQL_USER=zabbix ZBX_ADD_JAVA_GATEWAY=true ZBX_JAVAGATEWAY_ENABLE=true ZBX_JAVAGATEWAY=localhost
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_DEV} install locales && \
     locale-gen $LC_ALL && \
     apt-get ${APT_FLAGS_COMMON} update && \
@@ -88,7 +89,7 @@ ARG MAJOR_VERSION=3.0
 ARG ZBX_VERSION=${MAJOR_VERSION}.28
 ARG ZBX_SOURCES=https://git.zabbix.com/scm/zbx/zabbix.git
 ENV ZBX_VERSION=${ZBX_VERSION} ZBX_SOURCES=${ZBX_SOURCES} \
-    LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_ALL=en_US.UTF-8TERM=xterm \
+    LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_ALL=en_US.UTF-8 TERM=xterm \
     MIBDIRS=/var/lib/snmp/mibs/ietf:/var/lib/snmp/mibs/iana:/usr/share/snmp/mibs:/var/lib/zabbix/mibs MIBS=+ALL \
     ZBX_TYPE=server ZBX_DB_TYPE=mysql ZBX_OPT_TYPE=nginx \
     MYSQL_ALLOW_EMPTY_PASSWORD=true ZBX_ADD_SERVER=true ZBX_ADD_WEB=true DB_SERVER_HOST=localhost MYSQL_USER=zabbix ZBX_ADD_JAVA_GATEWAY=true ZBX_JAVAGATEWAY_ENABLE=true ZBX_JAVAGATEWAY=localhost
@@ -121,8 +122,9 @@ COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/src/zabbix_java/lib/ /usr/sbin/za
 COPY --from=builder /tmp/zabbix-${ZBX_VERSION}/frontends/php/ /usr/share/zabbix/
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /sbin/tini
 
-RUN apt-get ${APT_FLAGS_COMMON} update && \
-    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 && \
+RUN set -eux && \
+    apt-get ${APT_FLAGS_COMMON} update && \
+    DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install locales gnupg2 ca-certificates && \
     locale-gen $LC_ALL && \
     echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
     addgroup --system --quiet zabbix && \
@@ -161,7 +163,7 @@ RUN apt-get ${APT_FLAGS_COMMON} update && \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     DISTRIB_CODENAME=$(/bin/bash -c 'source /etc/lsb-release && echo $DISTRIB_CODENAME') && \
-    echo "deb http://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
+    echo "deb https://nginx.org/packages/ubuntu/ $DISTRIB_CODENAME nginx" >> /etc/apt/sources.list.d/nginx.list && \
     apt-get ${APT_FLAGS_COMMON} update && \
     DEBIAN_FRONTEND=noninteractive apt-get ${APT_FLAGS_PERSISTENT} install \
             iputils-ping \
@@ -190,7 +192,6 @@ RUN apt-get ${APT_FLAGS_COMMON} update && \
             php7.2-xml \
             snmp-mibs-downloader \
             supervisor \
-            ca-certificates \
             unixodbc && \
     mkdir -p /var/lib/locales/supported.d/ && \
     rm -f /var/lib/locales/supported.d/local && \
diff --git a/zabbix-appliance/ubuntu/README.md b/zabbix-appliance/ubuntu/README.md
index d2f50a832..7845826ec 100644
--- a/zabbix-appliance/ubuntu/README.md
+++ b/zabbix-appliance/ubuntu/README.md
@@ -157,7 +157,7 @@ Default values of these variables are specified after equal sign.
 
 The allowed variables are identical of parameters in official ``zabbix_server.conf``. For example, ``ZBX_LOGSLOWQUERIES`` = ``LogSlowQueries``.
 
-Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/3.0/manual/appendix/config/zabbix_server) to get more information about the variables.
+Please use official documentation for [``zabbix_server.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_server) to get more information about the variables.
 
 ## Allowed volumes for the Zabbix server container