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Kubernetes Docker Containerd Commands

Kubernetes Commands​

Kubelet Status Check​

Checking kubelet service status:

systemctl status kubelet

Viewing kubelet errors from Linux system:

journalctl -xeu kubelet

Viewing kubelet errors from Kubernetes:

kubectl get events --all-namespaces --sort-by='.metadata.creationTimestamp'

Pod Log and Status Check​

Viewing pod logs:

kubectl logs <POD_NAME> -n <NAMESPACE>

Viewing previous pod logs (if pod was restarted):

kubectl logs --previous <POD_NAME> -n apinizer

Viewing pod details:

kubectl describe pod <POD_NAME> -n apinizer

Pod Operations​

Entering pod:

kubectl exec -it <POD_NAME> -n prod /bin/bash

Making request without entering pod:

kubectl exec -it <POD_NAME> -n prod -- curl x.y.gov.tr

Deployment Operations​

Restarting deployment:

kubectl rollout restart deployment manager -n apinizer

Setting deployment replica count:

kubectl scale deploy cache -n prod --replicas=0

Deleting deployment:

kubectl delete -f apinizer-deployment.yaml

Force deleting pod in Terminating state:

kubectl delete pod <POD_NAME> -n apinizer --grace-period=0 --force

Version update:

bilgi

After pulling images to servers, the following commands are used. These commands work like the "vi" editor, use ":wq" to save and exit.

kubectl edit deployment manager -n apinizer
kubectl edit deployment cache -n prod
kubectl edit deployment worker -n prod

Cleaning evicted pods:

kubectl get pod -n prod | grep Evicted | awk '{print $1}' | xargs kubectl delete pod -n prod

Node Affinity Configuration​

Preventing pod from running on specific nodes:

affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: NotIn
              values:
                - kuberdemo55
                - kuberdemo56

Docker Commands​

Image Operations​

Listing images:

docker images

Listing all containers:

docker ps -a

Image pull operation:

sudo docker pull apinizercloud/manager:2024.xx.0

Image export:

sudo docker save apinizercloud/manager:2024.xx.0 > manager_2024.xx.0.tar

Image import:

sudo docker load < manager_2024.xx.0.tar

Containerd Commands​

Namespace Operations​

Listing namespaces:

sudo ctr namespaces list

Listing containers by namespace:

sudo ctr --namespace k8s.io containers ls

Image Operations​

Listing Apinizer images:

sudo ctr -n k8s.io images list | grep apinizer

Image pull operation:

sudo ctr --namespace k8s.io images pull docker.io/apinizercloud/manager:2024.05.0

Image export:

sudo ctr -n k8s.io images export /tmp/manager:2024.05.0.tar docker.io/apinizercloud/manager:2024.05.0

Image import:

sudo ctr --namespace k8s.io images import /tmp/manager:2024.05.0.tar
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