Docker: Difference between revisions
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==List images== | ==List images== | ||
docker images | docker images | ||
==Export image== | |||
docker save <image name> > imagename.tar | |||
==Get shell in running container== | ==Get shell in running container== | ||
To get image name | To get image name | ||
| Line 67: | Line 71: | ||
=FAQ= | =FAQ= | ||
==The container name "/mycontainer" is already in use by container== | ==Error messages== | ||
===The container name "/mycontainer" is already in use by container=== | |||
It already exists, so use | It already exists, so use | ||
docker start | docker start | ||
| Line 73: | Line 78: | ||
docker run | 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 | ===docker.service: Start request repeated too quickly=== | ||
Try | Try | ||
dockerd --debug | 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== | ==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.=== | ===docker: 'compose' is not a docker command.=== | ||
Check https://docs.docker.com/engine/install/debian/ | |||
===unknown flag: --detach=== | ===unknown flag: --detach=== | ||
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
