11 KiB
What is Zabbix?
Zabbix is an enterprise-class open source distributed monitoring solution.
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.
For more information and related downloads for Zabbix components, please visit https://hub.docker.com/u/zabbix/ and https://zabbix.com
What is Zabbix agent 2?
Zabbix agent 2 is deployed on a monitoring target to actively monitor local resources and applications (hard drives, memory, processor statistics etc).
Zabbix agent 2 images
These are the only official Zabbix agent 2 Docker images. They are based on Alpine Linux v3.12 images. The available versions of Zabbix agent 2 are:
Zabbix agent 2 4.4 (tags: alpine-4.4-latest) (unsupported)
Zabbix agent 2 4.4.* (tags: alpine-4.4.*) (unsupported)
Zabbix agent 2 5.0 (tags: alpine-5.0-latest, ubuntu-5.0-latest, ol-5.0-latest)
Zabbix agent 2 5.0.* (tags: alpine-5.0.*, ubuntu-5.0.*, ol-5.0.*)
Zabbix agent 2 5.2 (tags: alpine-5.2-latest, ubuntu-5.2-latest, ol-5.2-latest)
Zabbix agent 2 5.2.* (tags: alpine-5.2.*, ubuntu-5.2.*, ol-5.2.*)
Zabbix agent 2 5.4 (tags: alpine-5.4-latest, ubuntu-5.4-latest, ol-5.4-latest, alpine-latest, ubuntu-latest, ol-latest, latest)
Zabbix agent 2 5.4.* (tags: alpine-5.4.*, ubuntu-5.4.*, ol-5.4.*)
Zabbix agent 2 6.0 (tags: alpine-trunk, ubuntu-trunk, ol-trunk)
Images are updated when new releases are published. The image with latest tag is based on Alpine Linux.
How to use this image
Start zabbix-agent2
Start a Zabbix agent 2 container as follows:
docker run --name some-zabbix-agent -e ZBX_HOSTNAME="some-hostname" -e ZBX_SERVER_HOST="some-zabbix-server" -d zabbix/zabbix-agent2:tag
Where some-zabbix-agent2 is the name you want to assign to your container, some-hostname is the hostname, it is Hostname parameter in Zabbix agent 2 configuration file, some-zabbix-server is IP or DNS name of Zabbix server or proxy and tag is the tag specifying the version you want. See the list above for relevant tags, or look at the full list of tags.
Connects from Zabbix server or Zabbix proxy in other containers (Passive checks)
This image exposes the standard Zabbix agent 2 port (10050) 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:
$ docker run --name some-zabbix-server --link some-zabbix-agent:zabbix-agent2 -d zabbix/zabbix-server:latest
Connect to Zabbix server or Zabbix proxy containers (Active checks)
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:
$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server -d zabbix/zabbix-agent2:latest
Container shell access and viewing Zabbix agent 2 logs
The docker exec command allows you to run commands inside a Docker container. The following command line will give you a bash shell inside your zabbix-agent2 container:
$ docker exec -ti some-zabbix-agent /bin/bash
The Zabbix agent 2 log is available through Docker's container log:
$ docker logs some-zabbix-agent
Privileged mode
By default, Docker containers are "unprivileged" 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:
$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server --privileged -d zabbix/zabbix-agent2:latest
$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server -v /dev/sdc:/dev/sdc -d zabbix/zabbix-agent2:latest
Environment Variables
When you start the zabbix-agent2 image, you can adjust the configuration of the Zabbix agent 2 by passing one or more environment variables on the docker run command line.
ZBX_HOSTNAME
This variable is unique, case sensitive hostname. By default, value is hostname of the container. It is Hostname parameter in zabbix_agent2.conf.
ZBX_SERVER_HOST
This variable is IP or DNS name of Zabbix server or Zabbix proxy. By default, value is zabbix-server. It is Server parameter in zabbix_agent2.conf. It is allowed to specify Zabbix server or Zabbix proxy port number using ZBX_SERVER_PORT variable. It make sense in case of non-default port for active checks.
ZBX_PASSIVE_ALLOW
This variable is boolean (true or false) and enables or disables feature of passive checks. By default, value is true.
ZBX_PASSIVESERVERS
The variable is comma separated list of allowed Zabbix server or proxy hosts for connections to Zabbix agent 2 container.
ZBX_ACTIVE_ALLOW
This variable is boolean (true or false) and enables or disables feature of active checks. By default, value is true.
ZBX_ACTIVESERVERS
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: zabbix-server:10061,zabbix-proxy:10072.
ZBX_DEBUGLEVEL
The variable is used to specify debug level. By default, value is 3. It is DebugLevel parameter in zabbix_agent2.conf. Allowed values are listed below:
0- basic information about starting and stopping of Zabbix processes;1- critical information2- error information3- warnings4- for debugging (produces lots of information)5- extended debugging (produces even more information)
ZBX_TIMEOUT
The variable is used to specify timeout for processing checks. By default, value is 3.
Other variables
Additionally the image allows to specify many other environment variables listed below:
ZBX_ENABLEPERSISTENTBUFFER=false # Available since 5.0.0
ZBX_PERSISTENTBUFFERPERIOD=1h # Available since 5.0.0
ZBX_ENABLESTATUSPORT=
ZBX_SOURCEIP=
ZBX_ENABLEREMOTECOMMANDS=0 # Deprecated since 5.0.0
ZBX_LOGREMOTECOMMANDS=0
ZBX_STARTAGENTS=3
ZBX_HOSTNAMEITEM=system.hostname
ZBX_METADATA=
ZBX_METADATAITEM=
ZBX_REFRESHACTIVECHECKS=120
ZBX_BUFFERSEND=5
ZBX_BUFFERSIZE=100
ZBX_MAXLINESPERSECOND=20
ZBX_LISTENIP=
ZBX_UNSAFEUSERPARAMETERS=0
ZBX_TLSCONNECT=unencrypted
ZBX_TLSACCEPT=unencrypted
ZBX_TLSCAFILE=
ZBX_TLSCRLFILE=
ZBX_TLSSERVERCERTISSUER=
ZBX_TLSSERVERCERTSUBJECT=
ZBX_TLSCERTFILE=
ZBX_TLSKEYFILE=
ZBX_TLSPSKIDENTITY=
ZBX_TLSPSKFILE=
ZBX_DENYKEY=system.run[*] # Available since 5.0.0
ZBX_ALLOWKEY= # Available since 5.0.0
Default values of these variables are specified after equal sign.
The allowed variables are identical of parameters in official zabbix_agent2.conf configuration file. For example, ZBX_REFRESHACTIVECHECKS = RefreshActiveChecks.
Please use official documentation for zabbix_agent2.conf to get more information about the variables.
Allowed volumes for the Zabbix agent 2 container
/etc/zabbix/zabbix_agentd.d
The volume allows include *.conf files and extend Zabbix agent 2 using UserParameter feature.
/var/lib/zabbix/enc
The volume is used to store TLS related files. These file names are specified using ZBX_TLSCAFILE, ZBX_TLSCRLFILE, ZBX_TLSKEY_FILE and ZBX_TLSPSKFILE variables.
/var/lib/zabbix/buffer
The volume is used to store the file, where Zabbix Agent2 should keep SQLite database. To enable the feature specify ZBX_ENABLEPERSISTENTBUFFER=true. Available since 5.0.0.
The image variants
The zabbix-agent2 images come in many flavors, each designed for a specific use case.
zabbix-agent2:alpine-<version>
This image is based on the popular Alpine Linux project, available in the alpine official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.
This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. However, most software doesn't have an issue with this, so this variant is usually a very safe choice. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.
To minimize image size, it's uncommon for additional related tools (such as git or bash) to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile (see the alpine image description for examples of how to install packages if you are unfamiliar).
Supported Docker versions
This image is officially supported on Docker version 1.12.0.
Support for older versions (down to 1.6) is provided on a best-effort basis.
Please see the Docker installation documentation for details on how to upgrade your Docker daemon.
User Feedback
Documentation
Documentation for this image is stored in the agent2/ directory of the zabbix/zabbix-docker GitHub repo. Be sure to familiarize yourself with the repository's README.md file before attempting a pull request.
Issues
If you have any problems with or questions about this image, please contact us through a GitHub issue.
Known issues
Currently it is not allowed to specify ZBX_ALIAS environment variable. Please use /etc/zabbix/zabbix_agent.d volume with additional configuration files with Alias options.
Contributing
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.
Before you start to code, we recommend discussing your plans through a GitHub issue, 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.