建立第一個K8S應用

操做主機：masternode

1.手動建立一個應用

1.建立一個測試用的deployment

[root@linux-node1 ~]# kubectl run net-test --image=alpine --replicas=2 sleep 360000

2.查看獲取IP狀況

[root@linux-node1 ~]# kubectl get pod -o wide
NAME                        READY     STATUS    RESTARTS   AGE       IP          NODE
net-test-74f45db489-gmgv8   1/1       Running   0          1m        10.2.83.2   192.168.56.13
net-test-74f45db489-pr5jc   1/1       Running   0          1m        10.2.59.2   192.168.56.12

3.測試聯通性

ping 10.2.83.2

2.利用yaml文件建立k8s應用

1.建立deployment

https://github.com/unixhot/salt-kubernetes/tree/master/addonslinux

kubectl create -f nginx-deployment.yaml

2.查看deployment

kubectl get deployment

3.查看pod

kubectl get pod -o wide

4.測試pod訪問

curl --head 10.2.83.17

5.更新deployment

kubectl set image deployment/nginx-deployment nginx=nginx:1.12.2 --record

6.查看更新後的deployment

kubectl get deployment -o wide

7.查看更新歷史

kubectl rollout history deployment/nginx-deployment

8.查看具體某一個版本的升級歷史

kubelctl rollout history deployment/nginx-deployment --revision=1

9.快速回滾到上一個版本

kubectl rollout undo deployment/nginx-deployment

10.擴容到5個節點

kubectl scale deployment nginx-deployment --replicas 5

11. 查看k8s 內部服務

kubectl  get pod  -n kube-system
kubectl  get all  -n kube-system
kubectl  get service  -n kube-system

若是建立錯誤，能夠查看日誌
kubectl get pod -n kube-system # 查看name名
kubectl logs pod/」name「 -n kube-system