⭐️创建Pod
[root@master ~]# kubectl run nginx --image=harbor.tanc.com/library/ngix:latest
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be rmoved in a future version. Use kubectl run --generator=run-pod/v1 or kbectl create instead.
deployment.apps/nginx created
⭐️查看容器状态
[root@master ~]# kubectl run nginx --image=harbor.tanc.com/library/ngix:latest
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be rmoved in a future version. Use kubectl run --generator=run-pod/v1 or kbectl create instead.
deployment.apps/nginx created
⭐️开放端口
kubectl expose [pod名] --port [端口号]
⭐️查看服务service
kubectl get svc
⭐️ 增加副本数
kubectl scale deployment [pod名] --repolicas=[副本数]
⭐️删除pod-如果你的删除后你设定的副本数大于你当前pod数，rs就会给你在重新创建一个
kubectl delete pod [pod名]
🌟 实列
创建 nginx pod，端口映射为 80-->8000,期待副本数为3个
kubectl run nginx --image=harbor.tanc.com/library/nginx:latest
kubectl scale deployment nginx --replicas=3
kubectl expose deployment nginx --port=8000 --target-port=80
查看一下有几个副本数
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-6b48575596-bsdt2 1/1 Running 0 16m 10.244.2.3 node2 <none> <none>
nginx-6b48575596-fbdjf 1/1 Running 0 22m 10.244.2.2 node2 <none> <none>
nginx-6b48575596-g892j 1/1 Running 0 22m 10.244.1.3 node1 <none> <none>
删除一个副本试一下
[root@master ~]# kubectl delete pod nginx-6b48575596-g892j
pod "nginx-6b48575596-g892j" deleted
在来查看一下 它又重新运行了一个
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-6b48575596-bsdt2 1/1 Running 0 22m
nginx-6b48575596-fbdjf 1/1 Running 0 27m
nginx-6b48575596-wzmdp 1/1 Running 0 44s
由于我们映射了一个端口号我们可以试着访问一下
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-6b48575596-bsdt2 1/1 Running 0 23m 10.244.2.3 node2 <none> <none>
nginx-6b48575596-fbdjf 1/1 Running 0 29m 10.244.2.2 node2 <none> <none>
nginx-6b48575596-wzmdp 1/1 Running 0 2m34s 10.244.1.4 node1 <none> <none>
⭐️增加\减少副本期望数
kubectl scale deploy [deploy名] --replica=[副本数]
⭐️隔离和恢复隔离
kubectl cordon <node_name>
kubectl uncordon <node_name>
⭐️驱逐
kubectl drain <node>
🌟 滚动更新
创建一个 deploy在创建三个 nginx：v1的 pod
[root@master test]# cat apply.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: dp-test1
labels:
test: dp1
spec:
replicas: 3
template:
metadata:
name: web
labels:
app: webapp
spec:
containers:
- name: nginx-app
image: harbor.tanc.com/library/nginx:v1
imagePullPolicy: IfNotPresent
ports:
- name: web
containerPort: 80
执行
kubectl apply -f apply.yaml --record=true
--record的作用是将当前命令记录到revision中，可以知道每个revision对应的是哪个配置文件。
查看 deploy信息
kubectl describe dp-test1
把镜像换成v2在试一下
kubectl describe deploy dp-test1
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 10m deployment-controller Scaled up replica set dp-test1-688f6479b to 3
Normal ScalingReplicaSet 7s deployment-controller Scaled up replica set dp-test1-b5bc484f9 to 1
Normal ScalingReplicaSet 7s deployment-controller Scaled down replica set dp-test1-688f6479b to 2
Normal ScalingReplicaSet 7s deployment-controller Scaled up replica set dp-test1-b5bc484f9 to 2
Normal ScalingReplicaSet 5s deployment-controller Scaled down replica set dp-test1-688f6479b to 1
Normal ScalingReplicaSet 5s deployment-controller Scaled up replica set dp-test1-b5bc484f9 to 3
Normal ScalingReplicaSet 5s deployment-controller Scaled down replica set dp-test1-688f6479b to 0
上面的日志信息就描述了滚动升级的过程：
① 启动一个新版Pod。
② 把旧版Pod数量降为2。
③ 再启动一个新版，数量变为2。
④ 把旧版Pod数量降为1。
⑤ 再启动一个新版，数量变为3。
⑥ 把旧版Pod数量降为0。
查看 revision历史记录，
kubectl rollout history deployment dp-test1
deployment.extensions/dp-test1
REVISION CHANGE-CAUSE
1 kubectl create --filename=apply.yaml --record=true
2 kubectl create --filename=apply.yaml --record=true
回滚
kubectl rollout undo deployment dp-test1 --to-revision=1 ##这样他就会到v1了
查看
[root@master test]# kubectl get deploy -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
dp-test1 3/3 3 3 27m nginx-app harbor.tanc.com/library/nginx:v1 app=webapp
⭐️ 进入容器
kubectl exec -it [pod]
