文章目录
一、上传镜像到私有仓库
[root@server1 ~]# cd harbor/
[root@server1 harbor]# docker-compose start
[root@server1 harbor]# docker-compose ps
[root@server1 docker]# docker logout reg.westos.org
Removing login credentials for reg.westos.org
[root@server1 docker]# docker login reg.westos.org
[root@server1 harbor]# docker search busyboxplus
[root@server1 harbor]# docker pull rickiechina/busyboxplus
[root@server1 docker]# docker tag rickiechina/busyboxplus:latest reg.westos.org/library/busyboxplus:latest ##改名
[root@server1 docker]# docker push reg.westos.org/library/busyboxplus:latest ##上传
二、pod基本操作
1、创建Pod应用
Pod是可以创建和管理Kubernetes计算的最小可部署单元，一个Pod代表着集群中运行的一个进程，每个pod都有一个唯一的ip。
[root@server2 ~]# kubectl run -h ##查看创建pod帮助
[root@server2 ~]# kubectl run nginx --image=myapp:v1 ##创建一个pod应用，nginx是名字，myapp是景象
#--replicas=2 扩容参数 --record 记录参数
# kubectl run nginx --image=nginx --replicas=2 --record #参数使用方法
[root@server2 ~]# kubectl get pod ##查看pod
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 9s
[root@server2 ~]# kubectl get pod -n default ##查看指定namespace的节点
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 74s
[root@server2 ~]# kubectl get pod -o wide ##查看节点的具体信息
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 81s 10.244.1.7 server4 <none> <none>
[root@server2 ~]# curl 10.244.1.7
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@server2 ~]# kubectl run demo --image=busyboxplus -it ##交互式界面运行一个pod,ctrl+p+q退出可以通过kubectl attach demo -c demo -i -t重新进入
[root@server2 ~]# kubectl run demo --image=busyboxplus -it ##再次进入
#ip addr
[root@server2 ~]# kubectl run demo --image=busyboxplus -it
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 37s
nginx 1/1 Running 0 14m
[root@server2 ~]# kubectl attach demo -it
2、删除Pod
[root@server2 ~]# kubectl delete pod nginx ##删除pod
pod "nginx" deleted
[root@server2 ~]# kubectl describe pod demo ##查看详细描述
[root@server2 ~]# kubectl logs demo ##查看日志
3、deployment(控制器)
[root@server2 ~]# kubectl create deployment nginx --image=myapp:v1 ##创建一个pod
deployment.apps/nginx created ##生成一个新的deployment控制器的pod，删除之后会自动重新生成不同id的pod
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 6m28s
nginx-67f9d9c97f-xjg2n 1/1 Running 0 28s
[root@server2 ~]# kubectl delete pod nginx-67f9d9c97f-xjg2n ##删除pod后在查看
pod "nginx-67f9d9c97f-xjg2n" deleted ##生成新的id的pod
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 9m9s
nginx-67f9d9c97f-bt9k5 1/1 Running 0 116s
[root@server2 ~]# kubectl delete deployment nginx ##彻底删除deployment
[root@server2 ~]# kubectl get pod ##删除成功
4、Pod扩容与缩容
[root@server2 ~]# kubectl create deployment nginx --image=myapp:v1
deployment.apps/nginx created
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 13m
nginx-67f9d9c97f-649gg 1/1 Running 0 3s
[root@server2 ~]# kubectl scale deployment --replicas=2 nginx
deployment.apps/nginx scaled
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 13m
nginx-67f9d9c97f-649gg 1/1 Running 0 13s
nginx-67f9d9c97f-sq7qn 1/1 Running 0 6s
[root@server2 ~]# kubectl scale deployment --replicas=4 nginx
deployment.apps/nginx scaled
[root@server2 ~]# kubectl get pod -o wide
5、service微服务
- service是一个抽象概念，定义了一个服务的多个pod逻辑合集和访问pod的策略，一般把service称为微服务。
- 创建service
$ kubectl expose deployment（控制器） nginx --port=80 --target-port=80
此时pod客户端可以通过service的名称访问后端的两个Pod
ClusterIP: 默认类型，自动分配一个仅集群内部可以访问的虚拟IP
ClusterIP默认类型暴露端口
ClusterIP: 默认类型，自动分配一个仅集群内部可以访问的虚拟IP
[root@server2 ~]# kubectl expose deployment nginx --port=80 ##ClusterIP默认类型暴露端口
[root@server2 ~]# kubectl get svc
[root@server2 ~]# curl 10.97.0.120
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@server2 ~]# curl 10.97.0.120/hostname.html
nginx-67f9d9c97f-sq7qn
[root@server2 ~]# curl 10.97.0.120/hostname.html
nginx-67f9d9c97f-qd4mp
[root@server2 ~]# curl 10.97.0.120/hostname.html
nginx-67f9d9c97f-sq7qn
[root@server2 ~]# kubectl describe svc nginx ##查看deployment详细信息
[root@server2 ~]# kubectl get pod -n kube-system -o wide ##查看namespace对应的所有pod详细信息
[root@server2 ~]# kubectl scale deployment nginx --replicas=3
[root@server2 ~]# kubectl describe svc nginx
##server3和server4上同样可以访问到对应信息
[root@server3 ~]# curl 10.97.0.120/hostname.html
[root@server4 ~]# curl 10.97.0.120/hostname.html
NodePort类型暴露端口
使用NodePort类型暴露端口，让外部客户端访问Pod(即真机也可以访问)
$ kubectl edit svc nginx //修改service的type为NodePort
$ kubectl expose deployment nginx --port=80 --target-port=80 --type=NodePort //也可以在创建service时指定类型
NodePort: 在ClusterIP基础上为Service在每台机器上绑定一个端口，这样就可以通过 NodeIP:NodePort 来访问该服务
[root@server2 ~]# kubectl get svc ##查看TYPE
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 27d
nginx ClusterIP 10.97.0.120 <none> 80/TCP 9m54s
[root@server2 ~]# kubectl edit svc nginx ##TYPE改成NodePort
service/nginx edited
[root@server2 ~]# kubectl get svc ##80映射31572端口
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 27d
nginx NodePort 10.97.0.120 <none> 80:31572/TCP 10m
6、更新pod镜像
[root@server2 ~]# kubectl set image deployment nginx myapp=myapp:v2 ##更新到v2
[root@server2 ~]# kubectl rollout history deployment nginx ##查看更新记录
[root@server2 ~]# kubectl describe deployments.apps nginx
[root@foundation50 Desktop]# curl 192.168.0.2:31572
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
7、回滚
[root@server2 ~]# kubectl get pod ##rs值变成版本2的rs值
[root@server2 ~]# kubectl rollout undo deployment nginx --to-revision=1 //回滚版本
deployment.apps/nginx rolled back
[root@server2 ~]# kubectl rollout history deployment nginx //查看历史版本
deployment.apps/nginx
REVISION CHANGE-CAUSE
2 <none>
3 <none>
[root@foundation50 Desktop]# curl 192.168.0.2:31572
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@server2 ~]# kubectl get pod ##rs值变成版本1的rs值
