kube-admin（2）：kubernetes学习资料，常用命令。

本文的原文连接是:
https://blog.csdn.net/freewebsys/article/details/83618119

博主地址是：http://blog.csdn.net/freewebsys

1，关于kube视频

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第一节是老外分享的，英文不好懒得听了。
直接从第二节开始看。还是中文听着舒服。
https://www.kubernetes.org.cn/3546.html/2

当然 IBM 推出这个学习教程也顺便推动他的产品。
IBM® Cloud Private 私有云系统：

https://www.ibm.com/support/knowledgecenter/en/SSBS6K/product_welcome_cloud_private.html

最新的已经 3.1.0 了，这个也是kubernetes 的部署的一个简单方法。

minikube 的安装
https://kubernetes.cn/docs/tasks/tools/install-minikube/

当然也可以直接用docker 的gui 进行安装。现在也都是很方便了。
参考文章：
https://blog.csdn.net/freewebsys/article/details/83536077

2，使用命令

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$ kubectl -n kube-system get pods -o wide
NAME                                         READY     STATUS    RESTARTS   AGE       IP             NODE
etcd-docker-for-desktop                      1/1       Running   1          13d       192.168.65.3   docker-for-desktop
kube-apiserver-docker-for-desktop            1/1       Running   1          13d       192.168.65.3   docker-for-desktop
kube-controller-manager-docker-for-desktop   1/1       Running   1          13d       192.168.65.3   docker-for-desktop
kube-dns-86f4d74b45-m9tw8                    3/3       Running   0          13d       10.1.0.5       docker-for-desktop
kube-proxy-jqblr                             1/1       Running   0          13d       192.168.65.3   docker-for-desktop
kube-scheduler-docker-for-desktop            1/1       Running   1          13d       192.168.65.3   docker-for-desktop
kubernetes-dashboard-7b9c7bc8c9-xpvzw        1/1       Running   0          1d        10.1.0.6       docker-for-desktop

查看集群

$ kubectl cluster-info
Kubernetes master is running at https://localhost:6443
KubeDNS is running at https://localhost:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:17:39Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:05:37Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

$ kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
compose.docker.com/v1beta1
compose.docker.com/v1beta2
events.k8s.io/v1beta1
extensions/v1beta1
networking.k8s.io/v1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1

$ kubectl get no
NAME                 STATUS    ROLES     AGE       VERSION
docker-for-desktop   Ready     master    14d       v1.10.3

学习各种命令才是基础。

$ kubectl run nginx --image=nginx:alpine
deployment.apps "nginx" created

$ kubectl get deploy
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx     1         1         1            1           21s

$ kubectl describe deploy nginx
Name:                   nginx
Namespace:              default
CreationTimestamp:      Thu, 01 Nov 2018 14:42:22 +0800
Labels:                 run=nginx
Annotations:            deployment.kubernetes.io/revision=1
Selector:               run=nginx
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  1 max unavailable, 1 max surge
Pod Template:
  Labels:  run=nginx
  Containers:
   nginx:
    Image:        nginx:alpine
    Port:         
    Host Port:    
    Environment:  
    Mounts:       
  Volumes:        
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  
NewReplicaSet:   nginx-6fc74ccb78 (1/1 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  6m    deployment-controller  Scaled up replica set nginx-6fc74ccb78 to 1


$ kubectl get pod -o wide
NAME                     READY     STATUS    RESTARTS   AGE       IP         NODE
nginx-6fc74ccb78-xcgps   1/1       Running   0          19m       10.1.0.7   docker-for-desktop

$ kubectl logs nginx-6fc74ccb78-xcgps

$ kubectl exec -it nginx-6fc74ccb78-xcgps sh
/ # ifconfig
eth0      Link encap:Ethernet  HWaddr E6:F0:2A:8A:33:53  
          inet addr:10.1.0.7  Bcast:0.0.0.0  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1110 (1.0 KiB)  TX bytes:42 (42.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ # nginx -v
nginx version: nginx/1.15.5
/ # exit

创建服务：

nginx.svc.yaml：

apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  ports:
  - name:  http
    port: 8888
    nodePort: 30001
    targetPort: 80
  selector:
    run: nginx
  type: NodePort

$ kubectl create -f nginx.svc.yaml 
service "nginx" created

$ kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP   10.96.0.1               443/TCP          14d
nginx        NodePort    10.104.36.202           8888:30001/TCP   21s

$ kubectl get ep
NAME         ENDPOINTS           AGE
kubernetes   192.168.65.3:6443   14d
nginx        10.1.0.7:80         4m

 $ kubectl scale deploy nginx --replicas=3
deployment.extensions "nginx" scaled

$ kubectl get rs
NAME               DESIRED   CURRENT   READY     AGE
nginx-6fc74ccb78   3         3         3         34m

$ kubectl get pods
NAME                     READY     STATUS    RESTARTS   AGE
nginx-6fc74ccb78-jqpd5   1/1       Running   0          31s
nginx-6fc74ccb78-tzwb2   1/1       Running   0          31s
nginx-6fc74ccb78-xcgps   1/1       Running   0          34m

$ kubectl rollout history deploy 
deployments "nginx"
REVISION  CHANGE-CAUSE
1         

$ kubectl describe deploy nginx 
Name:                   nginx
Namespace:              default
CreationTimestamp:      Thu, 01 Nov 2018 14:42:22 +0800
Labels:                 run=nginx
Annotations:            deployment.kubernetes.io/revision=1
Selector:               run=nginx
Replicas:               3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  1 max unavailable, 1 max surge

4，总结

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最重要的就是 先把 kubectl 命令学习熟练。
就和 docker 命令类似，加上参数查看集群。
能很方便的进行容器的管理，查看，扩展，运维。
同时dashboard上面的也是直接访问api 类似的操作。
只不过是可视化的。我这边使用不是 minikube 而是docker 默认的kubernetes ，也是一样操作的。

中文文档：
https://k8smeetup.github.io/docs/home/
现在 kubernetes 的文档都非常的多了。学习起来也非常的方便。

本文的原文连接是:
https://blog.csdn.net/freewebsys/article/details/83618119

博主地址是：http://blog.csdn.net/freewebsys