【K8s笔记】kubernetes的相关命令

这是一些常见的kubectl和docker命令

kubectl

¶other

• kubectl get nodes
• kubectl get namespaces / ns
• kubectl delete all --all - 注意，使用这个命令的时候，kubernetes服务也会被删除，但是会自动重新创建
• kubectl apply -f {YAML}
• kubectl delete -f {YAML}

¶context

• kubectl config current-context
• kubectl config get-contexts
• kubectl config user-context {CONTEXT} - set context
• kubectl config delete-context {CONTEXT}
• kubectl config rename-context {OLD_NAME} {NEW_NAME}
• kubectl config delete-context {CONTEXT}
• kubectx - see all contexts
• kubectx {CONTEXT} - switch context
• kubectx {OLD_CONTEXT}={NEW_CONTEXT} - rename context
• kubectx -d {CONTEXT}- del context

¶namespace

• kubectl get ns
• kubectl config set-context --current --namespace={NAMESPACE}
• kubectl create ns {NAMESPACE}
• kubectl delete ns {NAMESPACE}
• kubectl get pods --all-namespaces

¶pod

• kubectl get pods
• kubectl describe pod {POD}
• kubectl delete pod {POD}
• kubectl run {POD} --image={IMAGE}
• kubectl get pods -o wide
• kubectl exec {POD} -- {COMMAND}

¶deployment

• kubectl get deployments / kubectl get deploy
• kubectl create deployment {DEPLOYMENT} --image={IMAGE} --replicas=n
• kubectl describe deployment {DEPLOYMENT}
• kubectl delete deployment {DEPLOYMENT}
• kubectl scale deployment {DEPLOYMENT} --replicas=n
• kubectl delete deployment {DEPLOYMENT}
• kubectl set image deployment {DEPLOYMENT} {DEPLOYMENT}={NEW_IMAGE}
• kubectl rollout status deployment {DEPLOYMENT}

¶Service

• kubectl get services / kubectl get svc
• kubectl describe service {SERVICE}
• kubectl delete service {SERVICE}
• kubectl expose deployment {DEPLOYMENT} --port={OUTER_PORT} --target-port={INNER_PORT} - expose这里就会自动映射随机pod了
• kubectl expose deployment {DEPLOYMENT} --type=NodePort --port={INNER_PORT}
• kubectl expose deploy {DEPLOYMENT} --type=LoadBalancer --port={INNER_PORT}

docker

¶management

• docker info
• docker version
• docker login
• docker images
• docker ps - running container
• docker ps -a - running & stopping container
• docker image inspect {CONTAINER}

¶running & stopping

• docker pull {IMAGE}
• docker run {IMAGE}
• docker run -d {IMAGE} - detached
• docker run --name {NAME} - customize container name
• docker run -v {VOLUME / DIR_IN_THE_HOST}:{DIR_IN_THE_CONTAINER}
• docker start {CONTAINER}
• docker stop/kill {CONTAINER}

¶limit

• docker run --memory="{MAX_MEMORY}" {IMAGE}
• docker run --cpus="{MAX_CPU_CORE}" {IMAGE}

¶shell

• docker run -it {CONTAINER} -- {SHELL} - attach shell
• docker run -it -- microsoft/powershell:nanoserver pwsh.exe - attach powershell
• docker container exec -it {CONTAINER} {SHELL} - attach shell to a running container
• docker container exec -it {CONTAINER} bash/sh - “ssh” into a container

¶cleaning up

• docker rm {CONTAINER}
• docker rm $(docker ps -a -q) - rm all stopped container
• docker rmi {IMAGE}
• docker system prune -a - rm all image that not in use, CAREFULLY USE IT

¶building

• docker build -t {NAME:TAG} -f {FILE}
• docker build -t {NAME:TAG} .
• docker tag {IMAGE} {NAME:TAG} - tag an existing image

¶volume - use in the production env

• docker create volume {VOLUME}
• docker volume ls
• docker volume inspect {VOLUME}
• docker volume rm {VOLUME}
• docker volume prune - del all volume that are not mounted

compose

需要docker-compose.yml配置文件在项目的根目录

• docker compose build -f {DOCKERFILE}
• docker compose start
• docker compose stop
• docker compose up -d - build and start
• docker compose ps
• docker compose rm
• docker compose down - stop and rm
• docker compose logs - get logs
• docker compose exec {CONTAINER} sh/bash
• docker compose --project-name {PROJECT_NAME} up -d
• docker compose -p {PROJECT_NAME} up -d
• docker compose ls
• docker compose cp {CONTAINER_ID}:{SRC_PATH} {LOCAL_DEST_PATH}
• docker compose cp {LOCAL_SRC_PATH} {CONTAINER_ID}:{DEST_PATH} - only support host to container or container to host

¶registry

• docker tag {IMAGE} {USER}/{IMAGE}:{TAR}
• docker pull {USER}/{IMAGE}:{TAG}
• docker push {USER}/{IMAGE}:{TAG}