Kubernetes - 명령어 모음

1. Kubernetes 컨텍스트 및 클러스터 관리

 

• 현재 컨텍스트 설정 또는 보기

kubectl config current-context        # Show the current context
kubectl config use-context <context> # Switch to a different context
kubectl config get-contexts           # List all available contexts

 

• 클러스터 정보 확인

kubectl cluster-info                   # Display information about the cluster
kubectl get nodes                      # List all nodes in the cluster
kubectl describe node <node-name>      # Detailed information about a specific node

2. 자원 관리

• 리소스 생성

kubectl create -f <file.yaml>          # Create resources defined in a YAML/JSON file
kubectl apply -f <file.yaml>           # Apply changes from a file (create/update)
kubectl run <name> --image=<image>     # Create a pod with a specific image

 

• 리소스 보기

kubectl get pods                       # List all pods
kubectl get deployments                # List all deployments
kubectl get services                   # List all services
kubectl get configmaps                 # List all ConfigMaps
kubectl get secrets                    # List all Secrets
kubectl get all                        # List all resources in the namespace

 

• 리소스 설명

kubectl describe pod <pod-name>        # Detailed information about a pod
kubectl describe deployment <name>     # Detailed information about a deployment
kubectl describe service <name>        # Detailed information about a service

 

• 리소스 삭제

kubectl delete pod <pod-name>          # Delete a specific pod
kubectl delete deployment <name>       # Delete a specific deployment
kubectl delete -f <file.yaml>          # Delete resources defined in a YAML/JSON file
kubectl delete namespace <namespace>   # Delete a namespace

 

 

3. 로그 및 디버깅

• 로그 보기

kubectl logs <pod-name>                # View logs of a pod
kubectl logs <pod-name> -c <container> # View logs for a specific container in a pod
kubectl logs -f <pod-name>             # Follow logs of a pod in real-time

 

• 디버깅 리소스

kubectl exec -it <pod-name> -- /bin/bash   # Open a shell in a running pod
kubectl exec <pod-name> -- <command>       # Execute a command in a running pod
kubectl port-forward <pod-name> 8080:80    # Forward a local port to a pod's port
kubectl get events                         # View cluster events

4. 네임스페이스

• 네임스페이스 관리

kubectl get namespaces                # List all namespaces
kubectl create namespace <namespace>  # Create a new namespace
kubectl delete namespace <namespace>  # Delete a namespace

• 네임스페이스 전환

kubectl config set-context --current --namespace=<namespace>  # Set default namespace

5. 리소스 확장 및 업데이트

• 배포 확장

kubectl scale deployment <name> --replicas=<number>  # Scale replicas

• 롤링 업데이트

kubectl rollout status deployment/<name>            # Check the status of a rollout
kubectl rollout undo deployment/<name>              # Roll back to the previous version
kubectl rollout restart deployment/<name>           # Restart a deployment

6. ConfigMap 및 비밀

• configmap

kubectl create configmap <name> --from-literal=key=value    # Create ConfigMap from a literal
kubectl create configmap <name> --from-file=<file>         # Create ConfigMap from a file
kubectl describe configmap <name>                         # Describe a ConfigMap

• 시크릿 오브젝트

kubectl create secret generic <name> --from-literal=key=value # Create a secret from a literal
kubectl describe secret <name>                                # Describe a Secret

7. YAML 구성

• 리소스를 YAML로 내보내기

kubectl get pod <pod-name> -o yaml          # Get a pod's YAML definition
kubectl get deployment <name> -o yaml       # Get a deployment's YAML definition

 

• YAML 파일의 변경 사항 적용

kubectl apply -f <file.yaml>                # Apply changes from a YAML file

8. 기타

• 리소스 사용량 보기

kubectl top nodes                          # View resource usage of nodes
kubectl top pods                           # View resource usage of pods

• 실패한 pod 디버그

kubectl describe pod <pod-name>            # Check events related to the pod
kubectl logs <pod-name>                    # Check pod logs
kubectl exec -it <pod-name> -- /bin/bash   # Access the pod for manual inspection

• 드라이런 모드

kubectl apply -f <file.yaml> --dry-run=client  # Check what will happen without making changes