学习k8s
1.minikube的使用练习
启动minikube start
检查节点信息 kubectl get nodes 查看集群信息 kubectl cluster-info
Deployment是一个更高层次的API对象，它管理ReplicaSets和Pod，并提供声明式更新等功能
2.使用deployment创建一个pod应用
$ kubectl create deployment kubernetes-bootcamp --image=jocatalin/kubernetes-bootcamp:v1
控制器名称 指定镜像
提示创建deployment.apps/kubernetes-bootcamp created
$ kubectl get deployments 查看deployments
NAME READY UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 1/1 1 1 21s
$ kubectl get pods #查看pod
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-7b7c64ccf7-52n67 1/1 Running 0 34s
$ kubectl get service #查看service 服务，这显然是集群的网络信息
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 45m
$ kubectl exp
explain expose
$ kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port=8080 #给控制器指定端口
service/kubernetes-bootcamp exposed
$ kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 47m
kubernetes-bootcamp NodePort 10.102.143.179 <none> 8080:32528/TCP 16s
$ curl http://127.0.0.1:32528 #通过本机访问
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-52n67 | v=1
$ curl http://127.0.0.1:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-52n67 | v=1
3.弹性伸缩pod
$ kubectl get deplpyments.apps #查看deplpyments
NAME READY UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 1/1 1 1 6m16s
$ kubectl scale deployment/kubernetes-bootcamp replica=5 #scale 弹性伸缩，指定pod数量
Error: required flag(s) "replicas" not set
$ kubectl scale deployment/kubernetes-bootcamp --replicas=5
deployment.apps/kubernetes-bootcamp scaled
$ kubectl get deployments.apps #通过deployment 管理副本数以及生命状态
NAME READY UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 5/5 5 5 7m46s
$ kubectl get pods #查看pod
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-7b7c64ccf7-52n67 1/1 Running 0 8m1s
kubernetes-bootcamp-7b7c64ccf7-j7vps 1/1 Running 0 33s
kubernetes-bootcamp-7b7c64ccf7-l88jf 1/1 Running 0 33s
kubernetes-bootcamp-7b7c64ccf7-sft8h 1/1 Running 0 33s
kubernetes-bootcamp-7b7c64ccf7-vlfvb 1/1 Running 0 33s
$ kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 51m
kubernetes-bootcamp NodePort 10.102.143.179 <none> 8080:32528/TCP 4m39s
$ curl http://localhost:32528 #访问服务时，默认是轮训的方式
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-l88jf | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-sft8h | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-j7vps | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-vlfvb | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-j7vps | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-j7vps | v=1
4.升级
$ kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2 #给镜像升级
deployment.apps/kubernetes-bootcamp image updated
$ deployment.extensions/kubernetes-bootcamp image updated
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-769746fd4-pqp97 | v=2 ##此时kubernetes-bootcamp用的镜像是V2
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-769746fd4-65lfz 1/1 Running 0 2m46s
kubernetes-bootcamp-769746fd4-pqp97 1/1 Running 0 2m52s
kubernetes-bootcamp-769746fd4-vlhg8 1/1 Running 0 2m44s
kubernetes-bootcamp-769746fd4-w9c8b 1/1 Running 0 2m52s
kubernetes-bootcamp-769746fd4-wlncc 1/1 Running 0 2m52s
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-769746fd4-pqp97 | v=2
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-769746fd4-w9c8b | v=2
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-769746fd4-pqp97 | v=2
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-769746fd4-wlncc | v=2
5.回滚
$ kubectl rollout undo deployments/kubernetes-bootcamp #回滚
deployment.apps/kubernetes-bootcamp rolled back
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-769746fd4-65lfz 1/1 Terminating 0 3m34s
kubernetes-bootcamp-769746fd4-pqp97 1/1 Running 0 3m40s
kubernetes-bootcamp-769746fd4-vlhg8 1/1 Terminating 0 3m32s
kubernetes-bootcamp-769746fd4-w9c8b 1/1 Terminating 0 3m40s
kubernetes-bootcamp-769746fd4-wlncc 1/1 Terminating 0 3m40s
kubernetes-bootcamp-7b7c64ccf7-29w6j 0/1 ContainerCreating 0 1s
kubernetes-bootcamp-7b7c64ccf7-f9nbm 0/1 ContainerCreating 0 1s
kubernetes-bootcamp-7b7c64ccf7-lqp7p 1/1 Running 0 5s
kubernetes-bootcamp-7b7c64ccf7-nqpfj 1/1 Running 0 5s
kubernetes-bootcamp-7b7c64ccf7-v2sl4 1/1 Running 0 6s
$ kubectl get deployments.apps
NAME READY UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 5/5 5 5 16m
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-769746fd4-65lfz 1/1 Terminating 0 3m50s
kubernetes-bootcamp-769746fd4-pqp97 1/1 Terminating 0 3m56s
kubernetes-bootcamp-769746fd4-vlhg8 1/1 Terminating 0 3m48s
kubernetes-bootcamp-769746fd4-w9c8b 1/1 Terminating 0 3m56s
kubernetes-bootcamp-769746fd4-wlncc 1/1 Terminating 0 3m56s
kubernetes-bootcamp-7b7c64ccf7-29w6j 1/1 Running 0 17s
kubernetes-bootcamp-7b7c64ccf7-f9nbm 1/1 Running 0 17s
kubernetes-bootcamp-7b7c64ccf7-lqp7p 1/1 Running 0 21s
kubernetes-bootcamp-7b7c64ccf7-nqpfj 1/1 Running 0 21s
kubernetes-bootcamp-7b7c64ccf7-v2sl4 1/1 Running 0 22s
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-v2sl4 | v=1
$ curl http://localhost:32528
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-7b7c64ccf7-v2sl4 | v=1
6.删除pod
Kubectl delete pod 加服务名称
删除pod 之前先删除deplpyments 不然是删不掉pod的
Kubectl delete deppyments kubernetes-bootcamp