Docker
Cleanup
Old containers can be removed all at once:
# Containers used hours,weeks or months ago
$ docker ps -a | egrep '(hours|weeks|months) ago' | awk '{print $1}' | xargs --no-run-if-empty docker rm
# All containers
$ docker rm $(docker ps -a -q)
Old Images: Source
# All images
$ docker rmi $(docker images -q)
# Untagged images
$ docker rmi $(docker images | grep "^<none>" | awk "{print $3}")
Check for experimental feature
docker version -f '{{ .Server.Experimental }}'
Error
Registry Endpoint
- Description:
When running
docker pull <imagename>
, the following error message appears:
...
Could not reach any registry endpoint
- Solution: This can have two reasons. Docker tries to download automatically the tag 'latest'. If that is not available, this can come up as error. Second: The installed docker version can be too old to play harmonously with the hub. Upgrade the docker version. This error has been seen at version 1.4 and 1.5 already.
Docker CentOS7
Errormessage:
/usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
Solution:
sudo yum install device-mapper-devel
Alternative: Update to the latest version with
sudo yum update
DeleteDevice
Source Error:
Unable to delete device: Error running DeleteDevice dm_task_run failed
Solution:
Ran full of disk space the first time, he? Well, happened to me as well. Reboot does not fix this. When filling up the disk, some garbage is left that prevents docker from starting now.
Just delete /var/lib/docker
and try again (migh want to save something?)
sudo rm -rf /var/lib/docker