Docker Container Sensor

The sensor monitors basic statistics of the Docker container

The sensor uses Docker Engine REST API to communicate with the container.

Performance Counters:

• % CPU Usage
• % Memory Usage
• Interface bytes IN
• Interface bytes OUT

Statuses:

• State
• Uptime

Default Alerts:

• The container is not running - Alert generated when NetCrunch detects the container is not in the 'running' state.

Monitoring

To monitor the Docker container, you have to enable remote API.

To enable remote API:

• Open /lib/system/system/docker.service file with any text editor

  vi /lib/systemd/system/docker.service
  

• Find the line which starts with ExecStart and add -H=tcp://0.0.0.0:2375

  ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock
  

• Save the Modified File

• Reload the docker daemon

  systemctl daemon-reload
  

• Restart the container

  sudo service docker restart
  

• Open a port on the firewall if necessary.

• To test that API is accessible, try to run test on the docker sensor, make sure you added that sensor to the proper node (just configured one)

containerdockerrestsensor