How to update all Docker images

Currently, Docker does not have a command to do this so we will have to do some good old fashioned command piping.

To automatically update all images:

docker images | grep -v REPOSITORY | awk '{print $1}' | xargs -L1 docker pull

Docker does not overwrite old images for us. To cleanup old images:

docker images | grep "<none>" | awk '{print $3}' | xargs -L1 docker rmi

Note that you must wait for the update process to finish. Here’s a summary of what each command does…

• docker images lists all images in the system
• grep -v REPOSITORY removes the header “REPOSITORY TAG IMAGE ID…..”
• awk '{print $1'} prints the first column which is the image name
• xargs -L1 docker pull passes each line to the command docker pull