Zabbix monitoring docker application configuration

The application of containers is becoming more and more common, but how do we manage a large number of containers? Of course it is monitored!

Today's article is about using zabbix to monitor docker containers!

About the principle of docker monitored by zabbix:

• Agent2 monitors Docker by calling the Docker API to obtain data
• The plugin directory is stored in zabbix-agent2/src/go/plugins/docker
• The client.go file defines the use of Unix socket addresses for communication between the docker client and the server.
• The default socket location is /var/run/docker.sock

The deployment of docekr monitored by zabbix is ​​roughly divided into five parts:

1. Download zabbix-agent2

• Install zabbix-agent2 on the monitored host. Note: it is agent2, not agent.
• The zabbix-agent2 version must be consistent with the server version

wget https://repo.zabbix.com/zabbix/5.2/rhel/7/x86_64/zabbix-agent2-5.2.7-1.el7.x86_64.rpm
rpm -ivh zabbix-agent2-5.2.7-1.el7.x86_64.rpm

2. Modify the configuration file and set the basic configuration.

vim /etc/zabbix/zabbix_agent2.conf
Server=192.168.1.4
ServerActive=192.168.1.4 #Start active data push mode Hostname=192.168.1.5

3. Add the zabbix user to the docker group. This is very important and must not be ignored.

Because after installing zabbix-agent2, a user zabbix will be created by default

id zabbix
uid=997(zabbix) gid=995(zabbix) group=995(zabbix)

To get the docker data, we need to have access to the /var/run/docker.sock socket.

ll /var/run/docker.sock 
srw-rw---- 1 root docker 0 Jul 7 09:09 /var/run/docker.sock

We can see that in addition to the root user, the docker group also has read and write permissions, so we add the zabbix user to the docker group.

usermod -aG docker zabbix
id zabbix
uid=997(zabbix) gid=995(zabbix) group=995(zabbix),994(docker)

4. Run the zabbix-agent2 service

systemctl start zabbix-agent2
systemctl enable zabbix-agent2

5. Configure on the web page

• In this experiment, our client still uses the host 192.168.1.5
• Steps: Click Configuration - Host - Click 192.168.1.5 host - Template - Select Link New Template - Host Group - Template - Select Docker - Click Update
  

After the update, we can see that there is docker in the monitoring item in配置——主機

After a while, we can view the monitored docker information in監測——最新數據

At this point we run a docker container of web01

docker run -d -p 80:80 --name web01 nginx:1.16.1
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
17095d63ed44 nginx:1.16.1 "nginx -g 'daemon of..." 20 minutes ago Up 20 minutes 0.0.0.0:80->80/tcp, :::80->80/tcp web01

After a while, we can see that zabbix detects the content of the docker container about the web01 container

The template used in this article is the built-in template. So far, our content about zabbix monitoring docker is complete!

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