kubernets 快速入门

查看节点信息

kubectl get nodes

查看节点详细信息

kubectl describe node node1.leiyan.com

显示版本

kubectl version

显示集群信息

kubectl cluster-info

运行一个容器

kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1 

kubectl run qzc-client --image=busyboy -it --replicas=1 --restart=Never

查看Pod 详细信息

[root@master ~]# kubectl get pods -o wide
NAME                            READY   STATUS    RESTARTS   AGE    IP            NODE               NOMINATED NODE   READINESS GATES
nginx-deploy-5b66f76f68-cbgxt   1/1     Running   0          6m6s   10.244.2.14   node2.leiyan.com   <none>           <none>
qinzc-7ffb658769-dvt6d          1/1     Running   0          4d4h   10.244.2.13   node2.leiyan.com   <none>           <none>

查看Deployment控制器信息

[root@master ~]# kubectl get deployment -o wide
NAME           READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS     IMAGES   SELECTOR
nginx-deploy   1/1     1            1           96s    nginx-deploy   nginx    run=nginx-deploy
qinzc          1/1     1            1           4d4h   qinzc          nginx    run=qinzc

查看kubernet系统Pod信息

[root@master ~]# kubectl get pods -n kube-system -o wide
NAME                                        READY   STATUS    RESTARTS   AGE   IP             NODE                NOMINATED NODE   READINESS GATES
coredns-86c58d9df4-p2qkm                    1/1     Running   1          13d   10.244.0.5     master.leiyan.com   <none>           <none>
coredns-86c58d9df4-xfbqx                    1/1     Running   1          13d   10.244.0.4     master.leiyan.com   <none>           <none>
etcd-master.leiyan.com                      1/1     Running   1          13d   192.168.1.90   master.leiyan.com   <none>           <none>
kube-apiserver-master.leiyan.com            1/1     Running   1          13d   192.168.1.90   master.leiyan.com   <none>           <none>
kube-controller-manager-master.leiyan.com   1/1     Running   2          13d   192.168.1.90   master.leiyan.com   <none>           <none>
kube-flannel-ds-amd64-pnrwv                 1/1     Running   3          13d   192.168.1.92   node2.leiyan.com    <none>           <none>
kube-flannel-ds-amd64-s95zx                 1/1     Running   2          13d   192.168.1.91   node1.leiyan.com    <none>           <none>
kube-flannel-ds-amd64-x2nh8                 1/1     Running   1          13d   192.168.1.90   master.leiyan.com   <none>           <none>
kube-proxy-h2kjm                            1/1     Running   1          13d   192.168.1.90   master.leiyan.com   <none>           <none>
kube-proxy-mwq8z                            1/1     Running   2          13d   192.168.1.91   node1.leiyan.com    <none>           <none>
kube-proxy-ns596                            1/1     Running   2          13d   192.168.1.92   node2.leiyan.com    <none>           <none>
kube-scheduler-master.leiyan.com            1/1     Running   2          13d   192.168.1.90   master.leiyan.com   <none>           <none>
[root@master ~]#

删除Pod

kubectl delete deployment nginx
kubectl delete pod nginx-deploy-5b66f76f68-cbgxtddrrr

service服务暴露端口至集群

kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP

kubectl expose deployment myapp --port=80

Service暴露服务端口至集群外部

kubectl edit svc myapp
更改type类型为NodePort

查看service暴露端口详细信息

[root@master ~]# kubectl get svc -n kube-system -o wide
NAME       TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE   SELECTOR
kube-dns   ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP   13d   k8s-app=kube-dns

扩展Pod副本数量、扩容

kubectl scale --replicas=5 deployment myapp

kubectl edit rs myapp
升级操作重建才会生效。

Pod默认为滚动更新/升级更新镜像

kubectl set image deployment myapp myapp=ikubernetes/myapp:v2

声明式更新

kubectl apply -f deploy-demo.yaml

显示更新、升级过程

kubectl rollout status deployment myapp

更新/升级回滚

kubectl rollout undo deployment myapp

修改、定义标签

kubectl lable TYPE  NAME KEY_1=VAL_1    
kubectl lable pods pod-demo release=canary
kubectl lable pods pod-demo release=stable --overwrite
kubectl lable pods pod-demo release=stable --overwrite
kubectl lable node node1.leiyan.com disktype=ssd

标签过滤出Pod

标签选择器：
    等值关系: =,==,!=
    集合关系：
        KEY in (VALUE1,VALUE2,....)            
        KEY notin (VALUE1,VALUE2,....)
        KEY            
        !KEY (VALUE1,VALUE2,....)

kubectl get pods -l app --show-lables
kubectl get pods -l app,release   #有app又有release标签的
kubectl get pods -l release=stable --show-lables
kubectl get pods -l release!=stable --show-lables      #没有release=stable标签的
kubectl get pods -L app,run

kubectl get pods -l "release in (canary,beta,alpha)"            #包含任一VALUE
kubectl get pods -l "release notin (canary,beta,alpha)"            #不包含任一VALUE