Running out of space in /var directory due to docker images

docker images are stored under /var/lib/docker

If you run out of space in /var partition.?

ok move /var/lib/docker directory to /root (considering space is available under /root) and create a symlink from /var/lib/docker to /root/docker.

Ensure you stop docker service before moving and verify docker daemon works fine after creating symlink.

so, all the commands put together:

systemctl stop docker

mv /var/lib/docker /root/

ln -sf  /root/docker /var/lib/docker

systemctl start docker

systemctl status  docker

thats it :) 

git push only the current branch

# This will make git push to push only the current branch

git config --global push.default simple

Delete all evicted pods in openshift

Delete all evicted pods in openshift:

Please check the commands thoroughly before executing it.

# This is for the current namespace
# eval "$(oc get pods -o json | jq -r '.items[] | select(.status.phase == "Failed" and .status.reason == "Evicted") | "oc delete pod --namespace " + .metadata.namespace + " " + .metadata.name')"


# This is for all namespaces
# eval "$(oc get pods -o json --all-namespaces | jq -r '.items[] | select(.status.phase == "Failed" and .status.reason == "Evicted") | "oc delete pod --namespace " + .metadata.namespace + " " + .metadata.name')"


Here,  jq - commandline JSON processor
You need to install jq first.

PS: Thanks to Stackoverflow!

Another PS:
As per the reader's comment :
Another way per-namespace without jq.

# for evicted in $(oc get pods | grep "Evicted" | awk '{print $1}'); do oc delete pod ${evicted}; done

Show only stopped docker containers

# show running containers
docker ps


# show running and stopped containers
docker ps -a


# adding q make it quiter :o)
docker ps -q
docker ps -q -a


# Now show only the stopped container
diff <(docker ps -a -q) <(docker ps -q )
 
   This shows difference between the two commands and
in this case the difference is stopped containers.

 

delete dangling docker images and remove stopped containers

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delete dangling docker images :

docker rmi $(sudo docker images --filter "dangling=true" -q --no-trunc)


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Delete stopped containers ( and not running containers):

docker rm $(docker ps -a -q)
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Delete untagged docker images :

docker rmi `docker images | grep "^<none>" | awk '{print $3}' ` --force

If no force is used, it throws error "image is being used by stopped container"

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# To delete a image remotely, and it has s3-apb as its name:


ssh remotee_server 'docker rmi `docker images | grep s3-apb | awk '"'"'{print $3}'"'"' ` --force'

Having double quote with remote command is tricky. it is getting evaluated as part of local shell itself. to avoid you need use like above.

source: https://stackoverflow.com/questions/20498599/how-to-escape-the-single-quote-character-in-an-ssh-remote-bash-command