Docker

Setup Docker

Guide For setting up Traefik Install latest docker-ce:

• sudo apt install docker-ce

Start the docker service and enable it to launch everytime at system boot.

• systemctl start docker
• systemctl enable docker

Check version of docker:

• docker version

Additional: Running Docker for non-root user Docker container can be run under the non-root user. We just need to add the user to the docker group.

Add 'aleks' user.

• useradd -m -s /bin/bash aleks

Now add the 'aleks' user to the docker group, then restart the docker service.

• usermod -a -G docker aleks
• systemctl restart docker

Test by running the docker hello-world.

• docker run -it hello-world

Install Docker Compose

• sudo apt install docker-compose

Check version:

• docker-compose version

Create Custom Docker Network

Check the available docker network on the system.

• docker network ls

Docker Commands

Docker commands reference can be found here: docker command ref

Stop docker container

• docker stop <container name>

remove container

• docker rm <container name>

run container

• docker run --name <container name>

Stop all the containers

• docker stop $(docker ps -a -q)

Remove all the containers

• docker rm $(docker ps -a -q)

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When running docker containers the run command will require extra options for containers with specific uses. Environment vairables can be added to a document container on startup using a .env file and the switch "--env-file=<path to env file>" in the run command

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Docker High CPU usage

See what containers are using system resources:

• docker stats --all
• docker stats --all --format "table Template:.ID\tTemplate:.Name\tTemplate:.CPUPerc\tTemplate:.MemUsage"

Check specific container for process:

• docker ps | grep <container id>

Check the logs for high cpu use container:

• docker logs --tail 100 <container Id>

Follow live logs:

• docker logs --follow <container ID>

restart docker container

• docker restart <container name>