zabbix-docker/Dockerfiles/agent2/rhel

<p><img src="https://assets.zabbix.com/img/logo/zabbix_logo_500x131.png" alt="logo"></p>
<h1 id="what-is-zabbix-">What is Zabbix?</h1>
<p>Zabbix is an enterprise-class open source distributed monitoring solution.</p>
<p>Zabbix is software that monitors numerous parameters of a network and the health and integrity of servers. Zabbix uses a flexible notification mechanism that allows users to configure e-mail based alerts for virtually any event. This allows a fast reaction to server problems. Zabbix offers excellent reporting and data visualisation features based on the stored data. This makes Zabbix ideal for capacity planning.</p>
<p>For more information and related downloads for Zabbix components, please visit <a href="https://hub.docker.com/u/zabbix/">https://hub.docker.com/u/zabbix/</a> and <a href="https://zabbix.com">https://zabbix.com</a></p>
<h1 id="what-is-zabbix-agent-2-">What is Zabbix agent 2?</h1>
<p>Zabbix agent 2 is deployed on a monitoring target to actively monitor local resources and applications (hard drives, memory, processor statistics etc).</p>
<h1 id="zabbix-agent-2-images">Zabbix agent 2 images</h1>
<p>Images are updated when new releases are published.</p>
<h1 id="how-to-use-this-image">How to use this image</h1>
<h2 id="start-zabbix-agent2-">Start <code>zabbix-agent2</code></h2>
<p>Start a Zabbix agent 2 container as follows:</p>
<pre><code>podman <span class="hljs-keyword">run</span><span class="bash"> --name some-zabbix-agent <span class="hljs-_">-e</span> ZBX_HOSTNAME=<span class="hljs-string">"some-hostname"</span> <span class="hljs-_">-e</span> ZBX_SERVER_HOST=<span class="hljs-string">"some-zabbix-server"</span> --init <span class="hljs-_">-d</span> zabbix/zabbix-agent2:tag</span>
</code></pre><p>Where <code>some-zabbix-agent2</code> is the name you want to assign to your container, <code>some-hostname</code> is the hostname, it is Hostname parameter in Zabbix agent 2 configuration file, <code>some-zabbix-server</code> is IP or DNS name of Zabbix server or proxy and <code>tag</code> is the tag specifying the version you want.</p>
<h2 id="connects-from-zabbix-server-or-zabbix-proxy-in-other-containers-passive-checks-">Connects from Zabbix server or Zabbix proxy in other containers (Passive checks)</h2>
<p>This image exposes the standard Zabbix agent 2 port (<code>10050</code>) to perform passive checks, so container linking makes Zabbix agent 2 instance available to Zabbix server and Zabbix proxy containers. Start your application container like this in order to link it to the Zabbix agent 2 container:</p>
<pre><code class="lang-console"><span class="hljs-comment">$</span> <span class="hljs-comment">podman</span> <span class="hljs-comment">run</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">name</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">link</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent:zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent2</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">init</span> <span class="hljs-literal">-</span><span class="hljs-comment">d</span> <span class="hljs-comment">zabbix/zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server:latest</span>
</code></pre>
<h2 id="connect-to-zabbix-server-or-zabbix-proxy-containers-active-checks-">Connect to Zabbix server or Zabbix proxy containers (Active checks)</h2>
<p>This image supports perform active checks, so container linking makes Zabbix server and Zabbix proxy containers available to Zabbix agent 2 instance. Start your application container like this in order to link Zabbix agent 2 to Zabbix server or Zabbix proxy containterns:</p>
<pre><code class="lang-console"><span class="hljs-comment">$</span> <span class="hljs-comment">podman</span> <span class="hljs-comment">run</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">name</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">link</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server:zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">init</span> <span class="hljs-literal">-</span><span class="hljs-comment">d</span> <span class="hljs-comment">zabbix/zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent2:latest</span>
</code></pre>
<h2 id="container-shell-access-and-viewing-zabbix-agent-2-logs">Container shell access and viewing Zabbix agent 2 logs</h2>
<p>The <code>podman exec</code> command allows you to run commands inside a Podman container. The following command line will give you a bash shell inside your <code>zabbix-agent2</code> container:</p>
<pre><code class="lang-console">$ podman <span class="hljs-built_in">exec</span> -ti some-zabbix-<span class="hljs-built_in">agent</span> /bin/bash
</code></pre>
<p>The Zabbix agent 2 log is available through Podman&#39;s container log:</p>
<pre><code class="lang-console">$ podman logs <span class="hljs-keyword">some</span>-zabbix-agent
</code></pre>
<h2 id="privileged-mode">Privileged mode</h2>
<p>By default, Podman containers are &quot;unprivileged&quot; and do not have access to the most of host resources. Zabbix agent 2 is designed to monitor system resources, to do that Zabbix agent 2 container must be privileged or you may mount some system-wide volumes. For example:</p>
<pre><code class="lang-console"><span class="hljs-comment">$</span> <span class="hljs-comment">podman</span> <span class="hljs-comment">run</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">name</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">link</span> <span class="hljs-comment">some</span><span class="hljs-literal">-</span><span class="hljs-comment">zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server:zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">server</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">privileged</span> <span class="hljs-literal">-</span><span class="hljs-literal">-</span><span class="hljs-comment">init</span> <span class="hljs-literal">-</span><span class="hljs-comment">d</span> <span class="hljs-comment">zabbix/zabbix</span><span class="hljs-literal">-</span><span class="hljs-comment">agent2:latest</span>
</code></pre>
<pre><code class="lang-console">$ podman run --name some-zabbix-agent --link some-zabbix-<span class="hljs-string">server:</span>zabbix-server -v <span class="hljs-regexp">/dev/</span><span class="hljs-string">sdc:</span><span class="hljs-regexp">/dev/</span>sdc --init -d zabbix/zabbix-<span class="hljs-string">agent2:</span>latest
</code></pre>
<h2 id="environment-variables">Environment Variables</h2>
<p>When you start the <code>zabbix-agent2</code> image, you can adjust the configuration of the Zabbix agent 2 by passing one or more environment variables on the <code>podman run</code> command line.</p>
<h3 id="-zbx_hostname-"><code>ZBX_HOSTNAME</code></h3>
<p>This variable is unique, case sensitive hostname. By default, value is <code>hostname</code> of the container. It is <code>Hostname</code> parameter in <code>zabbix_agent2.conf</code>.</p>
<h3 id="-zbx_server_host-"><code>ZBX_SERVER_HOST</code></h3>
<p>This variable is IP or DNS name of Zabbix server or Zabbix proxy. By default, value is <code>zabbix-server</code>. It is <code>Server</code> parameter in <code>zabbix_agent2.conf</code>. It is allowed to specify Zabbix server or Zabbix proxy port number using <code>ZBX_SERVER_PORT</code> variable. It make sense in case of non-default port for active checks.</p>
<h3 id="-zbx_passive_allow-"><code>ZBX_PASSIVE_ALLOW</code></h3>
<p>This variable is boolean (<code>true</code> or <code>false</code>) and enables or disables feature of passive checks. By default, value is <code>true</code>.</p>
<h3 id="-zbx_passiveservers-"><code>ZBX_PASSIVESERVERS</code></h3>
<p>The variable is comma separated list of allowed Zabbix server or proxy hosts for connections to Zabbix agent 2 container.</p>
<h3 id="-zbx_active_allow-"><code>ZBX_ACTIVE_ALLOW</code></h3>
<p>This variable is boolean (<code>true</code> or <code>false</code>) and enables or disables feature of active checks. By default, value is <code>true</code>.</p>
<h3 id="-zbx_activeservers-"><code>ZBX_ACTIVESERVERS</code></h3>
<p>The variable is comma separated list of allowed Zabbix server or proxy hosts for connections to Zabbix agent 2 container. You may specify port of Zabbix server or Zabbix proxy in such syntax: <code>zabbix-server:10061,zabbix-proxy:10072</code>.</p>
<h3 id="-zbx_debuglevel-"><code>ZBX_DEBUGLEVEL</code></h3>
<p>The variable is used to specify debug level. By default, value is <code>3</code>. It is <code>DebugLevel</code> parameter in <code>zabbix_agent2.conf</code>. Allowed values are listed below:</p>
<ul>
<li><code>0</code> - basic information about starting and stopping of Zabbix processes;</li>
<li><code>1</code> - critical information</li>
<li><code>2</code> - error information</li>
<li><code>3</code> - warnings</li>
<li><code>4</code> -  for debugging (produces lots of information)</li>
<li><code>5</code> - extended debugging (produces even more information)</li>
</ul>
<h3 id="-zbx_timeout-"><code>ZBX_TIMEOUT</code></h3>
<p>The variable is used to specify timeout for processing checks. By default, value is <code>3</code>.</p>
<h3 id="other-variables">Other variables</h3>
<p>Additionally the image allows to specify many other environment variables listed below:</p>
<pre><code><span class="hljs-attr">ZBX_ENABLEPERSISTENTBUFFER</span>=<span class="hljs-literal">false</span> # Available since <span class="hljs-number">5.0</span>.<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_PERSISTENTBUFFERPERIOD</span>=<span class="hljs-number">1</span>h # Available since <span class="hljs-number">5.0</span>.<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_ENABLESTATUSPORT</span>=
<span class="hljs-attr">ZBX_SOURCEIP</span>=
<span class="hljs-attr">ZBX_HEARTBEAT_FREQUENCY</span>=<span class="hljs-number">60</span> # Available since <span class="hljs-number">6.2</span>.<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_ENABLEREMOTECOMMANDS</span>=<span class="hljs-number">0</span> # Deprecated since <span class="hljs-number">5.0</span>.<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_LOGREMOTECOMMANDS</span>=<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_STARTAGENTS</span>=<span class="hljs-number">3</span>
<span class="hljs-attr">ZBX_HOSTNAMEITEM</span>=system.hostname
<span class="hljs-attr">ZBX_METADATA</span>=
<span class="hljs-attr">ZBX_METADATAITEM</span>=
<span class="hljs-attr">ZBX_REFRESHACTIVECHECKS</span>=<span class="hljs-number">120</span>
<span class="hljs-attr">ZBX_BUFFERSEND</span>=<span class="hljs-number">5</span>
<span class="hljs-attr">ZBX_BUFFERSIZE</span>=<span class="hljs-number">100</span>
<span class="hljs-attr">ZBX_MAXLINESPERSECOND</span>=<span class="hljs-number">20</span>
<span class="hljs-attr">ZBX_LISTENIP</span>=
<span class="hljs-attr">ZBX_LISTENPORT</span>=<span class="hljs-number">10051</span>
<span class="hljs-attr">ZBX_UNSAFEUSERPARAMETERS</span>=<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_TLSCONNECT</span>=unencrypted
<span class="hljs-attr">ZBX_TLSACCEPT</span>=unencrypted
<span class="hljs-attr">ZBX_TLSCAFILE</span>=
<span class="hljs-attr">ZBX_TLSCRLFILE</span>=
<span class="hljs-attr">ZBX_TLSSERVERCERTISSUER</span>=
<span class="hljs-attr">ZBX_TLSSERVERCERTSUBJECT</span>=
<span class="hljs-attr">ZBX_TLSCERTFILE</span>=
<span class="hljs-attr">ZBX_TLSKEYFILE</span>=
<span class="hljs-attr">ZBX_TLSPSKIDENTITY</span>=
<span class="hljs-attr">ZBX_TLSPSKFILE</span>=
<span class="hljs-attr">ZBX_DENYKEY</span>=system.run[*] # Available since <span class="hljs-number">5.0</span>.<span class="hljs-number">0</span>
<span class="hljs-attr">ZBX_ALLOWKEY</span>= # Available since <span class="hljs-number">5.0</span>.<span class="hljs-number">0</span>
</code></pre><p>Default values of these variables are specified after equal sign.</p>
<p>The allowed variables are identical of parameters in official <code>zabbix_agent2.conf</code> configuration file. For example, <code>ZBX_REFRESHACTIVECHECKS</code> = <code>RefreshActiveChecks</code>.</p>
<p>Please use official documentation for <a href="https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_agent2"><code>zabbix_agent2.conf</code></a> to get more information about the variables.</p>
<h2 id="allowed-volumes-for-the-zabbix-agent-2-container">Allowed volumes for the Zabbix agent 2 container</h2>
<h3 id="-etc-zabbix-zabbix_agentd-d-"><code>/etc/zabbix/zabbix_agentd.d</code></h3>
<p>The volume allows include <code>*.conf</code> files and extend Zabbix agent 2 using <code>UserParameter</code> feature.</p>
<h3 id="-var-lib-zabbix-enc-"><code>/var/lib/zabbix/enc</code></h3>
<p>The volume is used to store TLS related files. These file names are specified using <code>ZBX_TLSCAFILE</code>, <code>ZBX_TLSCRLFILE</code>, <code>ZBX_TLSKEY_FILE</code> and <code>ZBX_TLSPSKFILE</code> variables.</p>
<h3 id="-var-lib-zabbix-buffer-"><code>/var/lib/zabbix/buffer</code></h3>
<p>The volume is used to store the file, where Zabbix Agent2 should keep SQLite database. To enable the feature specify <code>ZBX_ENABLEPERSISTENTBUFFER=true</code>. Available since 5.0.0.</p>
<h1 id="user-feedback">User Feedback</h1>
<h2 id="documentation">Documentation</h2>
<p>Documentation for this image is stored in the <a href="https://github.com/zabbix/zabbix-docker/tree/trunk/Dockerfiles/agent2"><code>agent2/</code> directory</a> of the <a href="https://github.com/zabbix/zabbix-docker/"><code>zabbix/zabbix-docker</code> GitHub repo</a>. Be sure to familiarize yourself with the <a href="https://github.com/zabbix/zabbix-docker/blob/trunk/README.md">repository&#39;s <code>README.md</code> file</a> before attempting a pull request.</p>
<h2 id="issues">Issues</h2>
<p>If you have any problems with or questions about this image, please contact us through a <a href="https://github.com/zabbix/zabbix-docker/issues">GitHub issue</a>.</p>
<h3 id="known-issues">Known issues</h3>
<p>Currently it is not allowed to specify <code>ZBX_ALIAS</code> environment variable. Please use <code>/etc/zabbix/zabbix_agent.d</code> volume with additional configuration files with <code>Alias</code> options.</p>
<h2 id="contributing">Contributing</h2>
<p>You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.</p>
<p>Before you start to code, we recommend discussing your plans through a <a href="https://github.com/zabbix/zabbix-docker/issues">GitHub issue</a>, especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give you feedback on your design, and help you find out if someone else is working on the same thing.</p>