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Troubleshooting Kubernetes Applications
Troubleshooting Kubernetes Applications
- Selvyn Wright
Owned by Selvyn Wright
Listing available pods
shell command
kubectl get pods
To view the contents of a pod
shell command
kubectl describe pods
This command will display what containers are in a pod and what image was used to create the container
Retrieve a POD name
Linux shell command
export POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
echo $POD_NAME
curl http://localhost:8001/api/v1/namespaces/default/pods/$POD_NAME/proxy/Windows shell command
$Env:POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{end}}')
echo $Env:POD_NAME
curl http://localhost:8001/api/v1/namespaces/default/pods/$Env:POD_NAME/proxy/
Viewing container logs
shell command
kubectl logs $POD_NAME
Anything that the application would normally send to STDOUT becomes logs for the container within the Pod. We can retrieve these logs using the kubectl logs command:
Executing command on the container
shell command
kubectl exec $POD_NAME env
Listing PODs within a deployment
shell command
kubectl get pods -l app=nginx --show-labels
Error message indicating missing config file when running kubectl
You might see the following message
# kubectl version W0404 15:19:07.071657 17635 loader.go:223] Config not found: /root/.kube/config error: Missing or incomplete configuration info. Please point to an existing, complete config file: 1. Via the command-line flag --kubeconfig 2. Via the KUBECONFIG environment variable 3. In your home directory as ~/.kube/config To view or setup config directly use the 'config' command.
Simply run kubectl --client=true once only and the problem should be fixed