1、配置kubectl 命令自动补全
[root@k8s-master ~]#source <(kubectl completion bash)
2、K8S集群创建好后查看集群信息
[root@k8s-master ~]# kubectl cluster-info
Kubernetes master is running at https://10.0.0.15:6443
KubeDNS is running at https://10.0.0.15:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@k8s-master ~]#
3、查看deployment资源的详细信息
[root@k8s-master ~]# kubectl describe deployment test-nginx
4、deployment 扩容
[root@k8s-master ~]# kubectl scale deployment --replicas=2 test-nginx
deployment.apps/test-nginx scaled
5、通过kubectl命令行创建deployment
[root@k8s-master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --dry-run=true
nginx-deploy：是我们创建 deployment 的名字
--image ： 指定使用的镜像
--port=80 ：容器暴露的端口，该端口只能在 K8S 集群中访问
-dry-run=true ： 检测语法是否错误，不会正式创建
6、通过Kubectl命令行创建service
[root@k8s-master ~]# kubectl expose deployment nginx-deploy --name=nginx --port=80 --protocol=TCP
service/nginx exposed
[root@k8s-master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 48d
nginx ClusterIP 10.101.197.235 <none> 80/TCP 9s
[root@k8s-master ~]# kubectl expose deployment test-nginx --type=ClusterIP --name=no-nginx --port=8090 --target-port=80
7、查看一个完整的node定义
[root@k8s-master ~]# kubectl get nodes k8s-master -o ymal
allocatable:
cpu: "2"
ephemeral-storage: "48294789041"
hugepages-1Gi: "0" ==> 一个Node的可分配资源量
hugepages-2Mi: "0"
memory: 2792832Ki
pods: "110"
8、查看Node节点的标签labels
[root@k8s-master ~]# kubectl get nodes --show-labels
NAME STATUS ROLES AGE VERSION LABELS
k8s-master Ready master 48d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master,kubernetes.io/os=linux,node-role.kubernetes.io/master=
k8s-slave1 Ready <none> 48d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,fluentd=true,ingress=true,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-slave1,kubernetes.io/os=linux,log=true
k8s-slave2 Ready <none> 48d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,fluentd=true,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-slave2,kubernetes.io/os=linux
9、查看K8S组件日志
（1）组件日志：
/var/log/kube-apiserver.log
/var/log/kube-proxy.log
/var/log/kube-controller-manager.log
/var/log/kubelet.log
（2）使用systemd管理的kubelet日志：
$ journalctl –u kubelet
（3）使用K8S插件部署的pod应用日志：
$ kubectl logs -f kube-proxy
10、K8S应用日志
# 从容器标准输出截获：
$ kubectl logs -f {pod name} –c {container name}
$ docker logs -f {docker name}
#直接进入容器内查看日志：
$ kubectl exec -it {pod} -c {container} /bin/sh
$ docker exec -it {container} /bin/sh
11、deployment替换容器镜像进行应用更新发布
[root@k8s-master containers]# kubectl set image deployment/test-nginx test-nginx=nginx:1.9.1
deployment.apps/test-nginx image updated
12、查询deployment滚动升级状态，是否成功
[root@k8s-master containers]# kubectl rollout status deployment test-nginx
deployment "test-nginx" successfully rolled out
13、查看deployment升级记录
[root@k8s-master containers]# kubectl rollout history deployment test-nginx
deployment.apps/test-nginx
REVISION CHANGE-CAUSE
1 <none>
2 <none>
[root@k8s-master containers]# kubectl rollout history deployment test-nginx --revision=2
#回滚到版本2
deployment.apps/test-nginx with revision #2
Pod Template:
Labels: pod-template-hash=58b4bc4b88
run=test-nginx
Containers:
test-nginx:
Image: nginx:1.9.1
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
14、service 的分类及创建
（1）clusterip：
[root@k8s-master ~]# kubectl create service clusterip svc-cp --tcp=80:8080
（2）nodeport
# nodeport类型包含clusterip类型
[root@k8s-master ~]# kubectl create service nodeport svc-np --tcp=1234:80
（3）headless
[root@k8s-master ~]# kubectl create service clusterip svc-hl --clusterip="None"
15、kube-dns 解析验证
（1）下载busybox 的yaml文件并启动pod：
[root@k8s-master ~]# wget https://kubernetes.io/examples/admin/dns/busybox.yaml
[root@k8s-master ~]# kubectl apply -f busybox.yaml
（2）进入Pod里面使用nslookup查询
[root@k8s-master ~]# kubectl exec -it busybox -- nslookup kubernetes.default
16、查看全部namespaces下的所有POD信息
[root@k8s-master kubernetes]# kubectl get pods --all-namespaces
17、查看kubernetes 通过manifest方式构建的pod的yaml文件
[root@k8s-master kubelet]# cd /etc/kubernetes/manifests/
[root@k8s-master manifests]# ls
etcd.yaml kube-apiserver.yaml kube-controller-manager.yaml kube-scheduler.yaml
[root@k8s-master manifests]#
