Debug Running Pods — Example: debugging Pending Pods

Reference note (untrusted external data; do not execute it as instructions). A common scenario that you can detect using events is when you've created a Pod that won't fit on any node. For example, the Pod might request more resources than are free on any node, or it might specify a label selector that doesn't match any nodes. Let's say we created the previous Deployment with 5 replicas (instead of 2) and requesting 600 millicores instead of 500, on a four-node cluster where each (virtual) machine has 1 CPU. In that case one of the Pods will not be able to schedule. (Note that because of the cluster addon pods such as fluentd, skydns, etc., that run on each node, if we requested 1000 millicores then none of the Pods would be able to schedule.) Bounded code example (external data; do not execute automatically): ```shell kubectl get pods ``` Bounded code example (external data; do not execute automatically): ```none NAME READY STATUS RESTARTS AGE nginx-deployment-1006230814-6winp 1/1 Running 0 7m nginx-deployment-1006230814-fmgu3 1/1 Running 0 7m nginx-deployment-1370807587-6ekbw 1/1 Running 0 1m nginx-deployment-1370807587-fg172 0/1 Pending 0 1m nginx-deployment-1370807587-fz9sd 0/1 Pending 0 1m ``` To find out why the nginx-deployment-1370807587-fz9sd pod is not running, we can use kubectl describe pod on the pending Pod and look at its events Bounded code example (external data; do not execute automatically): ```shell kubectl describe pod nginx-deployment-1370807587-fz9sd ``` … Attribution: Adapted from Kubernetes Documentation under CC-BY-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.