• To check if kubelet is workingLink to To check if kubelet is working

systemctl status kubelet
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  • To check the Linux system logs when kubelet has an errorLink to To check the Linux system logs when kubelet has an error

journalctl -xeu kubelet
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  • To check the kubelet logs when it has any errorLink to To check the kubelet logs when it has any error

kubectl get events --all-namespaces  --sort-by='.metadata.creationTimestamp'
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  • To check the Pod logsLink to To check the Pod logs

kubectl logs <POD_NAME> -n <NAMESPACE>
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  • To check the previous Pod logs if it is seen it restarted at least one timeLink to To check the previous Pod logs if it is seen it restarted at least one time

kubectl logs --previous <POD_NAME> -n apinizer
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  • To check if there exist any general error on Pod or see the details of PodLink to To check if there exist any general error on Pod or see the details of Pod

kubectl describe pod <POD_NAME> -n apinizer
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  • To execute any command inside of a working PodLink to To execute any command inside of a working Pod

kubectl exec -it  <POD_NAME> -n prod /bin/bash
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  • To execute any command as it is from inside without getting inside of a working PodLink to To execute any command as it is from inside without getting inside of a working Pod

kubectl exec -it  <POD_NAME> -n prod -- curl x.y.gov.tr
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  • To restart all pods under a specific deploymentLink to To restart all pods under a specific deployment

kubectl rollout restart deployment manager -n apinizer
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  • To delete a deployment as a wholeLink to To delete a deployment as a whole

kubectl delete -f  apinizer-deployment.yaml
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  • To force a Pod to delete if it stucks on status "terminating"Link to To force a Pod to delete if it stucks on status "terminating"

kubectl delete pod <POD_NAME> -n apinizer --grace-period=0 --force
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  • To update version when the necessary images loaded on the servers' dockers'. It is worked like "vi" editor which it needs to do ":wq" to save and exit and ":q!" to exit without save.Link to To update version when the necessary images loaded on the servers' dockers'. It is worked like "vi" editor which it needs to do ":wq" to save and exit and ":q!" to exit without save.

kubectl edit deployment manager -n apinizer
kubectl edit deployment cache -n prod
kubectl edit deployment worker -n prod
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  • To clean up pods in the "Evicted" stateLink to To clean up pods in the "Evicted" state

kubectl get pod -n prod | grep Evicted | awk '{print $1}' | xargs kubectl delete pod -n prod
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  • Preventing Pod from Running on Specific Nodes Using Kubernetes Node AffinityLink to Preventing Pod from Running on Specific Nodes Using Kubernetes Node Affinity

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

  • Image listingLink to Image listing

docker images
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  • List All ContainersLink to List All Containers

docker ps -a
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  • Image PullLink to Image Pull

sudo docker pull apinizercloud/manager:2024.xx.0
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  • Image ExportLink to Image Export

sudo docker save apinizercloud/manager:2024.xx.0 > manager_2024.xx.0.tar
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  • Image ImportLink to Image Import

sudo docker load < manager_2024.xx.0.tar
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ContainerdLink to Containerd

  • Namespace ListingLink to Namespace Listing

sudo ctr namespaces list
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  • Containers listing with namespaceLink to Containers listing with namespace

sudo ctr --namespace k8s.io containers ls
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  • Images of Apinizer listing with namespaceLink to Images of Apinizer listing with namespace

sudo ctr -n k8s.io images list | grep apinizer
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  • Image PullLink to Image Pull

sudo ctr --namespace k8s.io images pull docker.io/apinizercloud/manager:2024.05.0
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  • Image ExportLink to Image Export

sudo ctr -n k8s.io images export /tmp/manager:2024.05.0.tar docker.io/apinizercloud/manager:2024.05.0
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  • Image ImportLink to Image Import

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