elasticsearch本来可以不加用户名和密码，基于我们目前接触越来越多的客户，为了数据的安全性，也需要遗憾的加上用户名和密码
下面是k8s部署的yaml
文件名称：k8s-elasticsearch.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: elasticsearch-u #为该Deployment设置key为app，value为elasticsearch-u的标签
  name: elasticsearch-u-dm
  namespace: lyb
spec:
  replicas: 1 #副本数量
  selector: #标签选择器，与上面的标签共同作用
    matchLabels: #选择包含标签app:elasticsearch的资源
      app: elasticsearch-u
  template: #这是选择或创建的Pod的模板
    metadata: #Pod的元数据
      labels: #Pod的标签，上面的selector即选择包含标签app:elasticsearch-u的Pod
        app: elasticsearch-u
    spec: #期望Pod实现的功能（即在pod中部署）
      containers: #生成container，与docker中的container是同一种
      - name: elasticsearch-u-container
        image: elasticsearch:7.12.1 #使用镜像elasticsearch-u: 创建container，该container默认9200端口可访问
        #imagePullPolicy: Never #使用本地镜像
        ports:
        - containerPort: 9200  # 开启本容器的9200端口可访问
        - containerPort: 9300 
        env:
        - name: ES_JAVA_OPTS
          value: -Xms512m -Xmx512m
        - name: bootstrap.memory_lock
          value: "true"
        - name: discovery.type
          value: single-node
        - name: node.name
          value: node-1
        - name: TAKE_FILE_OWNERSHIP #此环境变量是防止没有宿主机的777权限，value随便写，在nfs可以忽略，普通docker或者docker-swarm单机启动需要加
          value: "1111"
         # 下面是开启es验证的相关配置
        - name: http.cors.allow-headers
          value: Authorization
        - name: xpack.security.enabled
          value: "true"
        - name: xpack.security.transport.ssl.enabled
          value: "true"
        - name: network.host
          value: "0.0.0.0"

        volumeMounts:
        - mountPath: /usr/share/elasticsearch/data
          name: elasticsearch-data
      volumes:
        - name: elasticsearch-data
          nfs:
            server: nfs ip地址，需要自己改
            path: nfs共享文件夹，需要自己改
---
apiVersion: v1
kind: Service
metadata:
  labels:
   app: elasticsearch-u
  name: svc-elasticsearch-u # 服务名称
  namespace: lyb
spec:
  ports:
  - port: 9200 #写mysql本身端口
    name: elasticsearch-u92
    protocol: TCP
    targetPort: 9200 # 容器elasticsearch-u对外开放的端口 上面的dm已经指定了
    nodePort: 30192 #外网访问的端口
  - port: 9300
    protocol: TCP
    targetPort: 9300
    name: elasticsearch-u93
    nodePort: 30193
  selector:
    app: elasticsearch-u    #选择包含标签app:elasticsearch-u的资源
  type: NodePort

执行kubectl apply -f k8s-elasticsearch.yaml
然后进入到es的pod中
命令：

kubectl get pod -n lyb
#获取到es的pod名称
kubectl exec -it esPodName -n lyb

进入容器后

主要说明es如何设置密码
进入容器后，进入到bin目录，执行命令：elasticsearch-setup-passwords interactive
Initiating the setup of passwords for reserved users elastic,apm_system,kibana,kibana_system,logstash_system,beats_system,remote_monitoring_user.
You will be prompted to enter passwords as the process progresses.
Please confirm that you would like to continue [y/N]y
Enter password for [elastic]: 
Reenter password for [elastic]: 
Enter password for [apm_system]: 
Reenter password for [apm_system]: 
Enter password for [kibana_system]: 
Reenter password for [kibana_system]: 
Enter password for [logstash_system]: 
Reenter password for [logstash_system]: 
Enter password for [beats_system]: 
Reenter password for [beats_system]: 
Enter password for [remote_monitoring_user]: 
Reenter password for [remote_monitoring_user]: 
Changed password for user [apm_system]
Changed password for user [kibana_system]
Changed password for user [kibana]
Changed password for user [logstash_system]
Changed password for user [beats_system]
Changed password for user [remote_monitoring_user]
Changed password for user [elastic]
以上就是设置密码的过程，下面是翻译：
启动为保留用户elastic、apm_system、kibana、kibana_system、logstash_system、beats_system、remote_monitoring_user设置密码。
随着过程的进行，系统将提示您输入密码。
请确认您想继续[y/N]y
输入[elastic]的密码:
重新输入[elastic]的密码:
输入[apm_system]密码:
Reenter password for [apm_system]:
输入[kibana_system]密码:
Reenter password for [kibana_system]:
输入[logstash_system]的密码:
Reenter password for [logstash_system]:
输入[beats_system]的密码:
Reenter password for [beats_system]
输入[remote_monitoring_user]的密码:
Reenter password for [remote_monitoring_user]:
更改用户[apm_system]的密码
修改用户[kibana_system]的密码
更改用户[kibana]的密码
修改用户logstash_system的密码
修改用户[beats_system]的密码
修改用户[remote_monitoring_user]密码
修改弹性用户密码

然后浏览器访问 ip:30192
页面自动弹窗，输出刚才设置的密码即可访问