Curriculum Modulesmodule-10Pod Lifecycle and Workload Management

Pod Lifecycle and Workload Management

Pods

A Pod is the smallest and simplest Kubernetes object. A Pod represents a set of running containers on your cluster.

Pod Lifecycle

Pods have a defined lifecycle. They begin in the Pending phase, move through Running if at least one of their primary containers starts OK, and then through either the Succeeded or Failed phases depending on whether any container in the Pod terminated in failure.

Workload Resources

Instead of creating Pods directly, you almost always use workload resources like Deployments, ReplicaSets, and StatefulSets to manage them.

  • ReplicaSets: Ensure that a specified number of pod replicas are running at any given time.
  • Deployments: Provide declarative updates for Pods and ReplicaSets, handling rolling updates and rollbacks.

Probes

  • Liveness Probes: Determine if a container is running. If it fails, kubelet kills the container.
  • Readiness Probes: Determine if a container is ready to accept traffic.
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