In Kubernetes, the pod lifecycle refers to the different stages that a pod goes through from its creation to termination. Understanding the pod lifecycle is important for managing and troubleshooting pods effectively.
Here are the main stages of the pod lifecycle in Kubernetes:
👉 Pending: A newly formed pod goes into the Pending stage. In this situation, the pod must be assigned to an appropriate cluster node by the Kubernetes scheduler. When determining this assignment, the scheduler takes into account variables including resource availability, node affinity, and pod anti-affinity.
👉 Running: A pod enters the Running state after it is connected to a node. The containers in the pod are now generated, started, and running on the designated node. The pod might not be completely prepared to handle traffic since the containers might still be initialising or starting up.
👉 Succeeded: A pod enters the Succeeded stage when it successfully completes its primary mission and terminates. Usually, this occurs with batch jobs or one-time tasks. The pod doesn’t explicitly erase itself once it is in the Succeeded state. The system has the ability to recover the resources that the pod used.
👉 Failed: A pod enters the Failed state when it meets an issue or when its containers are unable to launch or run. This suggests that there is an issue with the pod’s operation. Although the pod won’t be restarted automatically, the issue can be fixed by manually deleting or creating it.
👉 Unknown: Due to a breakdown in communication between the pod’s node and the Kubernetes control plane, a pod’s status cannot be identified, and it moves into the Unknown state. This might happen if the node goes offline or loses connectivity.
To check the current status of a pod, you can use the “kubectl get pods” command, which displays the current status of all pods.
Hope it gave you some information :)
