Editing K3s - Kubernetes Simplified (section)

==Cluster Maintenance==
As packages (particularly helm charts) are updated, old container images are left behind.  Not deleting container images is not generally a bad thing since it enables pods to migrate between nodes in the cluster without waiting for the container to be downloaded.  Upgrading packages, however leaves a lot of cruft behind that can eventually cause issues with disk space.  Supposedly Kubernetes manages this garbage collection, but other related packages (such as ceph) complain about low disk space long before Kubernetes decides to do anything about it.  Cleaning out the old containers is simple, fortunately:
 /usr/local/bin/k3s crictl rmi -q
While this can be run at any time, running it too often will remove containers that are still valid, just not used at that time on that node -- resulting in longer migration times when nodes are drained or fail.