{{tag>Brouillon K8S}}

= Notes Kubernetes k8s - Diag

Voir :
* [[Notes VIO VMware Integrated OpenStack k8s]]
* [[Notes Kubernetes k8s - Utilisation]]

<code bash>
sudo journalctl -f -u kubelet.service
sudo journalctl -u containerd
</code>



<code bash>
kubectl cluster-info

kubectl get componentstatus

kubectl get ds -n kube-system

kubectl get deploy -n kube-system

kubectl get nodes

kubectl get pods --field-selector status.phase!=Running -A

kubectl events --types=Warning -A -w

kubectl get events --all-namespaces  --sort-by='.metadata.creationTimestamp'
</code>


Autre
  * Use kubectl describe pod ... to find the node running your Pod and the container ID (docker://...)
  * SSH into the node
  * Run docker exec -it -u root CONTAINER_ID /bin/bash



Si Metrics-server est installé
<code bash>
kubectl top node
kubectl top pod --sort-by=memory -A
</code>


<code ->
        - 'systemctl status kubelet'
        - 'journalctl -xeu kubelet'

Additionally, a control plane component may have crashed or exited when started by the container runtime. 
To troubleshoot, list all containers using your preferred container runtimes CLI.
Here is one example how you may list all running Kubernetes containers by using crictl:
        - 'crictl --runtime-endpoint unix:///var/run/containerd/containerd.sock ps -a | grep kube | grep -v pause'
        Once you have found the failing container, you can inspect its logs with:
        - 'crictl --runtime-endpoint unix:///var/run/containerd/containerd.sock logs CONTAINERID'
error execution phase wait-control-plane: could not initialize a Kubernetes cluster
To see the stack trace of this error execute with --v=5 or higher
</code>

Ulimits / Process ID limits and reservations
<code bash>
watch 'ps -e -w -o "thcount,cgname" --no-headers | awk "{a[\$2] += \$1} END{for (i in a) print a[i], i}" | sort --numeric-sort --reverse | head --lines=8'
</code>

FIXME