The first step in debugging a Pod is taking a look at it and check the status of each container.
kubectl describe pods <pod-name>
My pod stays pending
If a Pod is stuck in Pending it means that it can not be scheduled onto a node. Have a look at the reason column. There may be two reasons
You don’t have enough resources
- Your resources like CPU or Memory may be exhausted
- Try changing resource request and delete and re-create pod
You are using hostPort
- hostPort is unnecessary, try using a Service object to expose your Pod
- If you do require hostPort then you can only schedule as many Pods as there are nodes
My pod stays waiting
If a Pod is stuck in the Waiting state, then it has been scheduled to a worker node, but it can’t run on that machine. The most common cause of Waiting pods is a failure to pull the image.
- Make sure that you have the name of the image correct.
- Have you pushed the image to the repository?
- Run a manual docker pull image on your machine to see if the image can be pulled
My pod is crashing or unhealthy
# check the current logs kubectl logs <pod-name> <container-name> # if failed previously kubectl logs --previous <pod-name> <container-name> # check the logs in a container kubectl exec <pod-name> -c <container-name> -- <cmd> <args...>