Two types of garbage collection are performed on an OpenShift Container Platform node:
- Container garbage collection: Removes terminated containers.
- Image garbage collection: Removes images not referenced by any running pods.
Container garbage collection can be performed using eviction thresholds.
Image garbage collection relies on disk usage as reported by cAdvisor on the
node to decide which images to remove from the node.
The OpenShift administrator can configure how OpenShift Container Platform
performs garbage collection by creating a kubeletConfig object for each
Machine Config Pool using any combination of the following:
- soft eviction for containers
- hard eviction for containers
- eviction for images
To configure, follow the directions in
the documentation
This rule pertains to the memory.available setting of the evictionHard
section.