Docker: Difference between revisions
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=Links= | =Links= | ||
*[https://www.docker.com/ | *[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 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 | |||
==Export image== | |||
docker save <image name> > imagename.tar | |||
==Get shell in running container== | |||
To get image name | To get image name | ||
docker ps | docker ps | ||
then | then | ||
docker | 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== | ==Backups== | ||
*https://linuxconfig.org/docker-container-backup-and-recovery | *https://linuxconfig.org/docker-container-backup-and-recovery | ||
*[https://bobcares.com/blog/docker-backup/ Docker - Easy backup & restore] | *[https://bobcares.com/blog/docker-backup/ Docker - Easy backup & restore] | ||
=FAQ= | |||
==Error messages== | |||
===The container name "/mycontainer" is already in use by container=== | |||
It already exists, so use | |||
docker start | |||
instead of | |||
docker run | |||
===ERROR: failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory=== | |||
It really wants a file called '''Dockerfile''' | |||
===docker.service: Start request repeated too quickly=== | |||
Try | |||
dockerd --debug | |||
===dial unix /var/run/docker.sock: connect: permission denied=== | |||
You're not in group '''docker''' | |||
===docker rmi=== | |||
Error response from daemon: reference does not exist | |||
See https://www.baeldung.com/linux/docker-image-deletion-problem-fix | |||
==Compose== | |||
===unknown shorthand flag: 'd' in -d=== | |||
docker-compose is probably a script/wrapper. | |||
Install the https://docs.docker.com/engine/install/debian/ | |||
===docker: 'compose' is not a docker command.=== | |||
Check https://docs.docker.com/engine/install/debian/ | |||
===unknown flag: --detach=== | |||
apt install docker-compose-v2 | |||
=== image is being used by stopped container=== | |||
use the force | |||
Latest revision as of 11:55, 18 November 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
Export image
docker save <image name> > imagename.tar
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
Error messages
The container name "/mycontainer" is already in use by container
It already exists, so use
docker start
instead of
docker run
ERROR: failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory
It really wants a file called Dockerfile
docker.service: Start request repeated too quickly
Try
dockerd --debug
dial unix /var/run/docker.sock: connect: permission denied
You're not in group docker
docker rmi
Error response from daemon: reference does not exist
See https://www.baeldung.com/linux/docker-image-deletion-problem-fix
Compose
unknown shorthand flag: 'd' in -d
docker-compose is probably a script/wrapper. Install the https://docs.docker.com/engine/install/debian/
docker: 'compose' is not a docker command.
Check https://docs.docker.com/engine/install/debian/
unknown flag: --detach
apt install docker-compose-v2
image is being used by stopped container
use the force
