Scheduling, Preemption and Eviction

In Kubernetes, scheduling refers to making sure that Pods are matched to Nodes so that the kubelet can run them. Preemption is the process of terminating Pods with lower Priority so that Pods with higher Priority can schedule on Nodes. Eviction is the process of terminating one or more Pods on Nodes.

Scheduling

• Kubernetes Scheduler
• Assigning Pods to Nodes
• Pod Overhead
• Pod Topology Spread Constraints
• Taints and Tolerations
• Scheduling Framework
• Scheduler Performance Tuning
• Resource Bin Packing for Extended Resources

Pod Disruption

Pod disruption is the process by which Pods on Nodes are terminated either voluntarily or involuntarily.

Voluntary disruptions are started intentionally by application owners or cluster administrators. Involuntary disruptions are unintentional and can be triggered by unavoidable issues like Nodes running out of resources, or by accidental deletions.

• Pod Priority and Preemption
• Node-pressure Eviction
• API-initiated Eviction