背景简介：

kubernetes部署应用，特别的方便。用户只需要提交应用服务所需要的资源就可以了（通常是一个yaml配置文件），虽然没学过kubernetes，网上很多可以搭建k8s集群的博客（以后会学习）

一、 下载相关镜像

yaml文件中用到的镜像，下载本地之后。通过docker命令查看（官方镜像需要使用VPN，学习这些开源项目必须克服网络问题，要不然门都很难进啊）深有体会
这个镜像是我在官网 下载之后传到了自己的阿里云镜像仓库中保存

[root@node001 elastic01]# docker images
        REPOSITORY                                                                          TAG                 IMAGE ID            CREATED             SIZE
        nginx                                                                               alpine              336262580e12        7 days ago          18.6 MB
        registry.cn-beijing.aliyuncs.com/wangshuai/elasticsearch                            6.4.0               1ac676545731        3 weeks ago         791 MB

二、 配置yaml文件

 [root@node001 elastic01]# vim elasticsearch.yaml 
    
    apiVersion: v1                //版本号
    kind: ReplicationController //k8s的RC资源
    metadata:
      name: elasticsearch 
      labels:
        name: elasticsearch-logging //RC的全局唯一标识，名字
        kubernetes.io/cluster-service: "true"
    spec:
      replicas: 1
      selector:
        name: elasticsearch-logging
      template:
        metadata:
          name: es
          labels:
            name: elasticsearch-logging
            kubernetes.io/cluster-service: "true"
        spec:
          containers:
            - image: registry.cn-beijing.aliyuncs.com/wangshuai/elasticsearch:6.4.0  //docker 镜像
              imagePullPolicy: Never
              name: elasticsearch-logging
              ports:
                - name: es-port
                  containerPort: 9200
                - name: es-tran-port
                  containerPort: 9300
              volumeMounts:
                - name: es-persistent-storage
                  mountPath: /data
          volumes:
            - name: es-persistent-storage
              emptyDir: {}

三、 配置service

apiVersion: v1
    kind: Service
    metadata:
      name: elasticsearch-logging
      labels:
        name: elasticsearch-logging
        kubernetes.io/cluster-service: "true"
    spec:
      type: NodePort
      ports:
      - port: 9200
        targetPort: 9200
        nodePort: 30009   // 指定一个远程访问端口
      selector:
        name: elasticsearch-logging

四、 部署测试

    [root@node001 elastic01]# kubectl apply -f elasticsearch.yaml 
    replicationcontroller/elasticsearch created
    [root@node001 elastic01]# kubectl apply -f elasticsearch-service.yaml 
    service/elasticsearch-logging created

pod的状态说明：ImagePullBackOff、ErrImageNeverPull
镜像错误，拉取出错

    [root@node001 elastic01]# kubectl get pods 
    NAME                     READY     STATUS              RESTARTS   AGE
    curl-8fbc6f555-k47x9     0/1       ImagePullBackOff    0          1d
    elasticsearch-9g2rs      0/1       ErrImageNeverPull   0          1m
    nginx-5dbb4c75cd-9cbwl   1/1       Running             6          2d
    nginx-5dbb4c75cd-rnpvj   1/1       Running             5          2d

重新部署：

    [root@node001 elastic01]# kubectl delete -f  elasticsearch.yaml 
    replicationcontroller "elasticsearch" deleted
  
    [root@node001 elastic01]# kubectl delete -f  elasticsearch-service.yaml 
    service "elasticsearch-logging" deleted
  
    [root@node001 elastic01]# vim elasticsearch.yaml 
    [root@node001 elastic01]# kubectl apply -f elasticsearch.yaml 
    replicationcontroller/elasticsearch created

    [root@node001 elastic01]# kubectl get pod 
    NAME                     READY     STATUS             RESTARTS   AGE
    curl-8fbc6f555-k47x9     0/1       ImagePullBackOff   0          1d
    elasticsearch-pzd24      1/1       Running            0          17s
    nginx-5dbb4c75cd-9cbwl   1/1       Running            6          2d
    nginx-5dbb4c75cd-rnpvj   1/1       Running            5          2d
  
    [root@node001 elastic01]# kubectl apply -f elasticsearch-service.yaml 
    service/elasticsearch-logging created
  
    [root@node001 elastic01]# kubectl get svc
    NAME                       TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
    elasticsearch-logging      NodePort    10.100.126.10   <none>        9200:30009/TCP   11s
    example-service            ClusterIP   10.108.47.170   <none>        80/TCP           2d
    example-service-nodeport   NodePort    10.99.42.26     <none>        80:31991/TCP     2d
    kubernetes                 ClusterIP   10.96.0.1       <none>        443/TCP          2d

测试访问：

    [root@node001 elastic01]# curl "10.100.126.10:9200"//容器ip
    {
      "name" : "o27trev",
      "cluster_name" : "docker-cluster",
      "cluster_uuid" : "Du89qx0DSwi3G8QBlPZ5lw",
      "version" : {
        "number" : "6.4.0",
        "build_flavor" : "default",
        "build_type" : "tar",
        "build_hash" : "595516e",
        "build_date" : "2018-08-17T23:18:47.308994Z",
        "build_snapshot" : false,
        "lucene_version" : "7.4.0",
        "minimum_wire_compatibility_version" : "5.6.0",
        "minimum_index_compatibility_version" : "5.0.0"
      },
      "tagline" : "You Know, for Search"
    }

    [root@node001 elastic01]# curl http://192.168.223.5:30009//虚拟机ip
    {
      "name" : "o27trev",
      "cluster_name" : "docker-cluster",
      "cluster_uuid" : "Du89qx0DSwi3G8QBlPZ5lw",
      "version" : {
        "number" : "6.4.0",
        "build_flavor" : "default",
        "build_type" : "tar",
        "build_hash" : "595516e",
        "build_date" : "2018-08-17T23:18:47.308994Z",
        "build_snapshot" : false,
        "lucene_version" : "7.4.0",
        "minimum_wire_compatibility_version" : "5.6.0",
        "minimum_index_compatibility_version" : "5.0.0"
      },
      "tagline" : "You Know, for Search"
    }