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Kubernetes Commands

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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'

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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

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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

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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:
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

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Node Affinity Configuration

Preventing pod from running on specific nodes: 
affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: NotIn
              values:
                - kuberdemo55
                - kuberdemo56

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Docker Commands

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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

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Containerd Commands

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Namespace Operations

Listing namespaces: 
sudo ctr namespaces list
Listing containers by namespace: 
sudo ctr --namespace k8s.io containers ls

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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