Docker Container Monitoring With Zabbix

Credit Dmitry Lambert Original URL: https://blog.zabbix.com/docker-container-monitoring-with-zabbix/20175/

Importing the official Docker template

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Importing the Docker by Zabbix agent 2 template

Since we will be using the official Docker by Zabbix agent 2 template, first, we need to make sure that the template is actually available in our Zabbix instance. The template is available for Zabbix versions 5.0, 5.4, and 6.0. If you cannot find this template under Configuration – Templates, chances are that you haven’t imported it into your environment after upgrading Zabbix to one of the aforementioned versions. Remember that Zabbix does not modify or import any templates during the upgrade process, so we will have to import the template manually. If that is so, simply download the template and import it into your Zabbix instance by using the Import button in the Configuration – Templates section.

Installing and configuring Zabbix agent 2

Before we get started with configuring our host, we first have to install Zabbix agent 2 and configure it according to the template guidelines. Follow the steps in the download section of the Zabbix website and install the zabbix-agent2 package. Feel free to use any other agent deployment methods if you want to (like compiling the agent from the source files)

Installing Zabbix agent2 from packages takes just a few simple steps:

Install the Zabbix repository package:

rpm -Uvh https://repo.zabbix.com/zabbix/6.0/rhel/8/x86_64/zabbix-release-6.0-1.el8.noarch.rpm

Install the Zabbix agent 2 package:

dnf install zabbix-agent2

Configure the Server parameter by populating it with your Zabbix server/proxy address

vi /etc/zabbix/zabbix_agent2.conf
### Option: Server
# List of comma delimited IP addresses, optionally in CIDR notation, or DNS names of Zabbix servers and Zabbix proxies.
# Incoming connections will be accepted only from the hosts listed here.
# If IPv6 support is enabled then '127.0.0.1', '::127.0.0.1', '::ffff:127.0.0.1' are treated equally
# and '::/0' will allow any IPv4 or IPv6 address.
# '0.0.0.0/0' can be used to allow any IPv4 address.
# Example: Server=127.0.0.1,192.168.1.0/24,::1,2001:db8::/32,zabbix.example.com
#
# Mandatory: yes, if StartAgents is not explicitly set to 0
# Default:
# Server=

Server=192.168.50.49

Plugin specific Zabbix agent 2 configuration

Zabbix agent 2 provides plugin-specific configuration parameters. Mostly these are optional parameters related to a specific plugin. You can find the full list of plugin-specific configuration parameters in the Zabbix documentation. In the newer versions of Zabbix agent 2, the plugin-specific parameters are defined in separate plugin configuration files, located in /etc/zabbix/zabbix_agent2.d/plugins.d/, while in older versions, they are defined directly in the zabbix_agent2.conf file.

For the Zabbix agent 2 Docker plugin, we have to provide the Docker daemon unix-socket location. This can be done by specifying the following plugin parameter:

### Option: Plugins.Docker.Endpoint
# Docker API endpoint.
#
# Mandatory: no
# Default: unix:///var/run/docker.sock
# Plugins.Docker.Endpoint=unix:///var/run/docker.sock

The default socket location will be correct for your Docker environment – in that case, you can leave the configuration file as-is.

Once we have made the necessary changes in the Zabbix agent 2 configuration files, start and enable the agent:

systemctl enable zabbix-agent2 --now

Check if the Zabbix agent2 is running:

tail -f /var/log/zabbix/zabbix_agent2.log

Before we move on to Zabbix frontend, I would like to point your attention to the Docker socket file permission – the zabbix user needs to have access to the Docker socket file. The zabbix user should be added to the docker group to resolve the following error messages.

[Docker] cannot fetch data: Get http://1.28/info: dial unix /var/run/docker.sock: connect: permission denied
ZBX_NOTSUPPORTED: Cannot fetch data.

You can add the zabbix user to the Docker group by executing the following command:

usermod -aG docker zabbix

Configuring the docker host

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Configuring the host representing our Docker environment

After importing the template, we have to create a host which will represent our Docker instance. Give the host a name and assign it to a Host group – I will assign it to the Linux servers host group. Assign the Docker by Zabbix agent 2 template to the host. Since the template uses Zabbix agent 2 to collect the metrics, we also have to add an agent interface on this host. The address of the interface should point to the machine running your Docker containers. Finish up the host configuration by clicking the Add button.

Docker by Zabbix agent 2 template

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Regular docker template items

The template contains a set of regular items for the general Docker instance metrics, such as the number of available images, Docker architecture information, the total number of containers, and more.

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Docker template Low-level discovery rules

On top of that, the template also gathers container and image-specific information by using low-level discovery rules.

Once Zabbix discovers your containers and images, these low-level discovery rules will then be used to create items, triggers, and graphs from prototypes for each of your containers and images. This way, we can monitor container or image-specific metrics, such as container memory, network information, container status, and more.