Common Kubernetes Commands for Creating, Managing, and Monitoring Resources

1. Create and manage resources

Create a Deployment: kubectl create deployment hello-world --image=gcr.io/google-samples/hello-app:1.0 . List Deployments: kubectl get deployments . Update image: kubectl set image deployment/hello-world hello-world=gcr.io/google-samples/hello-app:v2 . Roll back: kubectl rollout undo deployment/hello-world --to-revision=1 . Delete Deployment: kubectl delete deployment hello-world . View logs: kubectl logs -f deployment/hello-world .

Manage Pods: create with kubectl run nginx --replicas=3 --image=nginx , list with kubectl get pods , delete with kubectl delete pod nginx , view logs with kubectl logs -f nginx .

Manage Services: expose a Deployment via kubectl expose deployment/nginx --port=80 --target-port=80 --type=NodePort , describe with kubectl describe service nginx , patch with kubectl patch service/nginx -p '{"spec": {"ports":[{"name":"http","port":80,"targetPort":80}]}}' , delete with kubectl delete service nginx .

Manage Ingresses: apply rule kubectl apply -f examples/guestbook/redis-ingress.yaml , describe with kubectl describe ingress nginx , replace with kubectl replace --force=true -f examples/guestbook/redis-ingress.yaml , delete with kubectl delete ingress nginx .

2. View Kubernetes cluster status

Cluster info: kubectl cluster-info . Nodes: kubectl get nodes and detailed info kubectl describe node . Node IPs: kubectl get nodes -o wide . Node resource usage: kubectl top node . Pods across namespaces: kubectl get pods -A --all-namespaces . Services and Deployments: kubectl get services,deployments . Resource quotas: kubectl describe quota . Individual Pod status and logs: kubectl get pods , kubectl describe pod , kubectl logs .

3. Run container applications

Run a new container: kubectl run nginx --replicas=3 --image=nginx . Update image: kubectl set image deployment/nginx new-image:tag . View container logs: kubectl logs -f nginx . Scale controllers: kubectl scale rc/rc-name --replicas=n . Check pod health: kubectl describe pod/pod-name . Perform rolling updates: kubectl rollout status deploy/deployment-name . List events: kubectl get events .

Service monitoring: expose external address with minikube service service-name , view status with kubectl get services , change type via kubectl patch svc nginx -p '{"spec":{"type":"LoadBalancer"}}' , reset with kubectl rolling-update service-name -c new-config .

Ingress routing: create rule kubectl apply -f path/to/rule.yaml , replace with kubectl replace -f path/to/rule.yaml , list with kubectl get ingresses , delete with kubectl delete ingresses ingress-name .

4. Update application images and resource limits

Rollback to previous revision: kubectl rollout undo deployment/nginx-deployment --to-revision=1 . Set new image: kubectl set image deployment/nginx-deployment nginx=new_image . Edit deployment to change CPU/memory limits: kubectl edit deployment/nginx-deployment .

5. Log management and monitoring

Fetch pod logs: kubectl logs deployment/nginx-pod or follow with kubectl logs -f deployment/nginx-pod . Deploy Fluentd for log collection: kubectl apply -f https://raw.githubusercontent.com/kubernetes/fluentd-elasticsearch-stack/master/stackdriver-gcp.yaml . Verify Fluentd daemonset: kubectl describe daemonset fluentd-gcp-v2.0.18-logging . View collected logs: kubectl logs $(kubectl get pods -l app=fluentd-gcp -o jsonpath='{.items[0].metadata.name}') .