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211 lines
11 KiB
Markdown
211 lines
11 KiB
Markdown
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# What is Zabbix?
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Zabbix is an enterprise-class open source distributed monitoring solution.
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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.
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For more information and related downloads for Zabbix components, please visit https://hub.docker.com/u/zabbix/ and https://zabbix.com
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# What is Zabbix agent 2?
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Zabbix agent 2 is deployed on a monitoring target to actively monitor local resources and applications (hard drives, memory, processor statistics etc).
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# Zabbix agent 2 images
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These are the only official Zabbix agent 2 Docker images. They are based on Alpine Linux v3.10 images. The available versions of Zabbix agent 2 are:
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Zabbix agent 2 4.4 (tags: alpine-4.4-latest, alpine-latest, latest)
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Zabbix agent 2 4.4.* (tags: alpine-4.4.*)
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Zabbix agent 2 5.0 (tags: alpine-trunk)
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Images are updated when new releases are published. The image with ``latest`` tag is based on Alpine Linux.
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# How to use this image
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## Start `zabbix-agent2`
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Start a Zabbix agent 2 container as follows:
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docker run --name some-zabbix-agent -e ZBX_HOSTNAME="some-hostname" -e ZBX_SERVER_HOST="some-zabbix-server" -d zabbix/zabbix-agent2:tag
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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](https://hub.docker.com/r/zabbix/zabbix-agent2/tags/).
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## Connects from Zabbix server or Zabbix proxy in other containers (Passive checks)
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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:
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```console
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$ docker run --name some-zabbix-server --link some-zabbix-agent:zabbix-agent2 -d zabbix/zabbix-server:latest
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```
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## Connect to Zabbix server or Zabbix proxy containers (Active checks)
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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:
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```console
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$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server -d zabbix/zabbix-agent2:latest
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```
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## Container shell access and viewing Zabbix agent 2 logs
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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:
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```console
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$ docker exec -ti some-zabbix-agent /bin/bash
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```
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The Zabbix agent 2 log is available through Docker's container log:
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```console
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$ docker logs some-zabbix-agent
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```
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## Privileged mode
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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:
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```console
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$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server --privileged -d zabbix/zabbix-agent2:latest
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```
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```console
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$ docker run --name some-zabbix-agent --link some-zabbix-server:zabbix-server -v /dev/sdc:/dev/sdc -d zabbix/zabbix-agent2:latest
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```
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## Environment Variables
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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.
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### `ZBX_HOSTNAME`
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This variable is unique, case sensitive hostname. By default, value is `hostname` of the container. It is ``Hostname`` parameter in ``zabbix_agent2.conf``.
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### `ZBX_SERVER_HOST`
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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.
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### `ZBX_PASSIVE_ALLOW`
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This variable is boolean (``true`` or ``false``) and enables or disables feature of passive checks. By default, value is `true`.
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### `ZBX_PASSIVESERVERS`
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The variable is comma separated list of allowed Zabbix server or proxy hosts for connections to Zabbix agent 2 container.
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### `ZBX_ACTIVE_ALLOW`
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This variable is boolean (``true`` or ``false``) and enables or disables feature of active checks. By default, value is `true`.
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### `ZBX_ACTIVESERVERS`
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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``.
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### `ZBX_LOADMODULE`
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The variable is list of comma separated loadable Zabbix modules. It works with volume ``/var/lib/zabbix/modules``. The syntax of the variable is ``dummy1.so,dummy2.so``.
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### `ZBX_DEBUGLEVEL`
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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:
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- ``0`` - basic information about starting and stopping of Zabbix processes;
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- ``1`` - critical information
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- ``2`` - error information
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- ``3`` - warnings
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- ``4`` - for debugging (produces lots of information)
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- ``5`` - extended debugging (produces even more information)
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### `ZBX_TIMEOUT`
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The variable is used to specify timeout for processing checks. By default, value is ``3``.
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### Other variables
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Additionally the image allows to specify many other environment variables listed below:
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```
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ZBX_SOURCEIP=
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ZBX_ENABLEREMOTECOMMANDS=0
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ZBX_LOGREMOTECOMMANDS=0
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ZBX_STARTAGENTS=3
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ZBX_HOSTNAMEITEM=system.hostname
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ZBX_METADATA=
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ZBX_METADATAITEM=
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ZBX_REFRESHACTIVECHECKS=120
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ZBX_BUFFERSEND=5
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ZBX_BUFFERSIZE=100
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ZBX_MAXLINESPERSECOND=20
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ZBX_LISTENIP=
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ZBX_UNSAFEUSERPARAMETERS=0
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ZBX_TLSCONNECT=unencrypted
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ZBX_TLSACCEPT=unencrypted
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ZBX_TLSCAFILE=
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ZBX_TLSCRLFILE=
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ZBX_TLSSERVERCERTISSUER=
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ZBX_TLSSERVERCERTSUBJECT=
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ZBX_TLSCERTFILE=
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ZBX_TLSKEYFILE=
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ZBX_TLSPSKIDENTITY=
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ZBX_TLSPSKFILE=
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```
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Default values of these variables are specified after equal sign.
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The allowed variables are identical of parameters in official ``zabbix_agent2.conf`` configuration file. For example, ``ZBX_REFRESHACTIVECHECKS`` = ``RefreshActiveChecks``.
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Please use official documentation for [``zabbix_agent2.conf``](https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_agent2) to get more information about the variables.
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## Allowed volumes for the Zabbix agent 2 container
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### ``/etc/zabbix/zabbix_agentd.d``
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The volume allows include ``*.conf`` files and extend Zabbix agent 2 using ``UserParameter`` feature.
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### ``/var/lib/zabbix/modules``
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The volume allows load additional modules and extend Zabbix agent 2 using ``LoadModule`` feature.
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### ``/var/lib/zabbix/enc``
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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.
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# The image variants
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The `zabbix-agent2` images come in many flavors, each designed for a specific use case.
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## `zabbix-agent2:alpine-<version>`
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This image is based on the popular [Alpine Linux project](http://alpinelinux.org), available in [the `alpine` official image](https://hub.docker.com/_/alpine). Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.
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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](http://www.musl-libc.org) instead of [glibc and friends](http://www.etalabs.net/compare_libcs.html), 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](https://news.ycombinator.com/item?id=10782897) for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.
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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](https://hub.docker.com/_/alpine/) for examples of how to install packages if you are unfamiliar).
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# Supported Docker versions
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This image is officially supported on Docker version 1.12.0.
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Support for older versions (down to 1.6) is provided on a best-effort basis.
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Please see [the Docker installation documentation](https://docs.docker.com/installation/) for details on how to upgrade your Docker daemon.
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# User Feedback
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## Documentation
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Documentation for this image is stored in the [`agent2/` directory](https://github.com/zabbix/zabbix-docker/tree/4.4/agent2) of the [`zabbix/zabbix-docker` GitHub repo](https://github.com/zabbix/zabbix-docker/). Be sure to familiarize yourself with the [repository's `README.md` file](https://github.com/zabbix/zabbix-docker/blob/master/README.md) before attempting a pull request.
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## Issues
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If you have any problems with or questions about this image, please contact us through a [GitHub issue](https://github.com/zabbix/zabbix-docker/issues).
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### Known issues
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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.
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## Contributing
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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.
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Before you start to code, we recommend discussing your plans through a [GitHub issue](https://github.com/zabbix/zabbix-docker/issues), 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.
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