Image Handling
| docker image list | list downloaded images |
| docker rmi image_name | delete image |
Administration
| docker system df | show docker disk usage |
| docker system prune -a (optional with –volumes to remove unused volumes) | free space – remove stopped containers, images, cache |
| systemctl restart docker | restarts the docker service (and all your container) |
| ss -tulpn | check if docker containers listens to any port |
docker exec contaienr_id cat /etc/hosts
or
docker inspect -f ‘{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}’ contaienr_id | check container ip address |
| docker stats –no-stream –format “table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}” | shows how much CPU, memory, network, and disk I/O a running container is using |
| docker logs –since 30m –tail 100 -f container_id | displays up to the last 100 log lines from the past 30 minutes and then follows new log entries as they appear |
Container Handling
| docker ps | list running containers |
| docker ps -a | list all the docker containers (running and stopped) |
| docker stop container_id | stop container |
| docker rm container_id | delete stopped container |
| docker update –restart=unless-stopped container_id | make sure container re-start, unless manually stopped |
| docker run -l debug container_id | run container with log |
| docker logs -f container_id | display log |
| docker exec -it container_id /bin/sh | open a shell in the running container |
| docker commit container_id user/test_image | this command saves modified container state into a new image user/test_image |
| docker run -ti –entrypoint=sh user/test_image | run with a different entrypoint |
| docker run –volume-driver=nfs container_id | mount NFS share |
Docker Compose
| docker-compose -f ~/docker/docker-compose.yml up -d | The -d option daemonizes it in the background |
| docker-compose -f ~/docker/docker-compose.yml down | completely stop and remove containers, images, volumes, and networks (go back to how it was before running docker compose file) |
| docker-compose -f ~/docker/docker-compose.yml pull | Pull latest images |
| docker-compose logs container_id | check real-time logs |
| docker-compose stop container_id | stops a running container |
| docker-compose config | test your.env file which is used for variable substitution in the docker-compose.yaml |
