How to clean up docker images/containers

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Here are some commands that I use for cleaning up unused or dangling docker images.

## New commands (for docker >= 1.13)
# clean up all unused containers, networks, images (both dangling and unreferenced)
>> sudo docker system prune

# remove images older than 4 months since their creation
>> sudo docker system prune -a --filter "until=3840h"

## Old ones
# remove exited containers
>> sudo docker ps -a | grep Exit | cut -d ' ' -f 1 | xargs sudo docker rm

# remove dangling images
>> sudo docker rmi $(docker images -f "dangling=true" -q)

# remove images older than 4 months since their creation
>> sudo docker system prune -a --filter "until=3840h"

References

How to remove old and unused Docker images
How to remove old Docker containers