Docker: Difference between revisions
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=Links= | =Links= | ||
*[https://www.docker.com/ Homepage] | |||
=Docs= | |||
*[https://docs.docker.com/compose Docker-compose] | |||
*https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7 | *https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7 | ||
*[https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes Removing images, containers and volumes] | |||
*[https://training.play-with-docker.com/beginner-linux/ Docker for beginners] | |||
*[https://runnable.com/docker/basic-docker-networking Docker networking] | |||
*[https://docs.docker.com/config/pruning/ Docker pruning] | |||
=HOWTO= | |||
==List running containers== | ==List running containers== | ||
docker ps | docker ps | ||
==Get shell in container== | ==List containers== | ||
docker exec -it | docker ps -a | ||
==Show disk usage== | |||
docker system df | |||
outputs: | |||
TYPE TOTAL ACTIVE SIZE RECLAIMABLE | |||
Images 27 10 11.35GB 5.72GB (50%) | |||
Containers 12 12 123.6MB 0B (0%) | |||
Local Volumes 0 0 0B 0B | |||
Build Cache 0 0 0B 0B | |||
===RECLAIMABLE=== | |||
Is what you get back when running | |||
docker prune -a | |||
==List images== | |||
docker images | |||
==Get shell in running container== | |||
To get image name | |||
docker ps | |||
then | |||
docker exec -it <image-id> bash | |||
==Network== | |||
docker network ls | |||
docker network inspect | |||
==image has dependent child images== | |||
docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=<image_id> -q) | |||
==Dangling images== | |||
===list dangling images=== | |||
docker images -f dangling=true | |||
===Remove dangling image=== | |||
docker rmi image-id | |||
===Remove all dangling images=== | |||
docker rmi $(docker images -f dangling=true -q) | |||
==image is being used by stopped container xyz== | |||
docker rm xyz | |||
and try again | |||
==Backups== | |||
*https://linuxconfig.org/docker-container-backup-and-recovery | |||
*[https://bobcares.com/blog/docker-backup/ Docker - Easy backup & restore] | |||
=FAQ= | |||
==The container name "/mycontainer" is already in use by container== | |||
It already exists, so use | |||
docker start | |||
instead of | |||
docker run | |||
==Compose== | |||
===docker: 'compose' is not a docker command.=== | |||
apt install docker-compose | |||
===unknown flag: --detach=== | |||
apt install docker-compose-v2 |
Latest revision as of 16:23, 8 April 2024
Links
Docs
- Docker-compose
- https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7
- Removing images, containers and volumes
- Docker for beginners
- Docker networking
- Docker pruning
HOWTO
List running containers
docker ps
List containers
docker ps -a
Show disk usage
docker system df
outputs:
TYPE TOTAL ACTIVE SIZE RECLAIMABLE Images 27 10 11.35GB 5.72GB (50%) Containers 12 12 123.6MB 0B (0%) Local Volumes 0 0 0B 0B Build Cache 0 0 0B 0B
RECLAIMABLE
Is what you get back when running
docker prune -a
List images
docker images
Get shell in running container
To get image name
docker ps
then
docker exec -it <image-id> bash
Network
docker network ls docker network inspect
image has dependent child images
docker inspect --format='Template:.Id Template:.Parent' $(docker images --filter since=<image_id> -q)
Dangling images
list dangling images
docker images -f dangling=true
Remove dangling image
docker rmi image-id
Remove all dangling images
docker rmi $(docker images -f dangling=true -q)
image is being used by stopped container xyz
docker rm xyz
and try again
Backups
FAQ
The container name "/mycontainer" is already in use by container
It already exists, so use
docker start
instead of
docker run
Compose
docker: 'compose' is not a docker command.
apt install docker-compose
unknown flag: --detach
apt install docker-compose-v2