openGauss在kubernetes集群环境上的部署

openGauss是一款开源关系型数据库管理系统 , 深度融合华为在数据库领域多年的经验，结合企业级场景需求，持续构建竞争力特性;kubernetes也是一个开源的，用于管理云平台中多个主机上的容器化的应用，Kubernetes的目标是让部署容器化的应用简单并且高效,Kubernetes提供了应用部署，规划，更新，维护的一种机制, 本篇文章将介绍openGauss在kubernetes集群环境上的部署探索
1.检查k8s运行环境
[root@n-k8s-m ~]# kubectl get node

NAME       STATUS     ROLES    AGE    VERSION
n-k8s-m    Ready      master   349d   v1.18.0
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2.查看准备好的openGauss的docker镜像
[root@n-k8s-m ~]# docker images

REPOSITORY         TAG                 IMAGE ID            CREATED             SIZE
nginx             latest              4cdc5dd7eaad        36 hours ago        133MB
opengauss         2.0.0               757bf74560e3        5 weeks ago         639MB
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3.安装NFS服务器存储
#安装依赖包
[root@n-k8s-m ~]#yum -y install nfs-utils rpcbind
#开机启动
[root@n-k8s-m ~]#systemctl enable rpcbind.service
[root@n-k8s-m ~]#systemctl enable nfs-server.service
[root@n-k8s-m ~]#systemctl start rpcbind.service #端口是111
[root@n-k8s-m ~]#systemctl start nfs-server.service # 端口是 2049
#配置NFS
[root@n-k8s-m ~]#mkdir /home/pv1
[root@n-k8s-m ~]#chown nfsnobody:nfsnobody /home/pv1
[root@n-k8s-m ~]#cat /etc/exports

/home/pv1 192.168.137.0/24(rw,async,all_squash)  
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[root@n-k8s-m ~]#exportfs -rv

exporting 192.168.137.0/24:/home/pv1
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4.创建openGauss所使用的存储pv
#编写yaml文件
[root@n-k8s-m ~]# cat opengauss_pv.yml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: opengauss-pv
  labels:
    type: nfs001
spec:
  capacity:
    storage: 1Gi 
  accessModes:
    - ReadWriteMany 
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: "/home/pv1"
    server: 192.168.137.61
    readOnly: false

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#创建pv
[root@n-k8s-m opengauss]# kubectl create -f opengauss_pv.yml

persistentvolume/opengauss-pv created
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#查看创建pv
[root@n-k8s-m opengauss]# kubectl get pv

NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                            STORAGECLASS          REASON   AGE
opengauss-pv                               1Gi        RWX            Recycle          Available           
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5.创建openGauss所使用的存储pvc
#编写yaml文件
[root@n-k8s-m ~]# cat opengauss_pvc.yml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: opengauss-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

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#创建pvc
[root@n-k8s-m opengauss]# kubectl create -f opengauss_pvc.yml

persistentvolumeclaim/opengauss-pv created
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#查看创建pvc
[root@n-k8s-m opengauss]# kubectl get pvc

NAME                     STATUS   VOLUME                  CAPACITY   ACCESS MODES   STORAGECLASS          AGE
opengauss-pvc         Bound    opengauss-pv           1Gi        RWX                                  4s

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6.创建openGauss的Deployment
#编写yaml文件

apiVersion: apps/v1
kind: Deployment
metadata:
  name: opengauss-deployment
spec:
  selector:
    matchLabels:
      app: opengauss
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: opengauss
    spec:
      containers:
        - image: opengauss:2.0.0
          name: opengauss-service
          imagePullPolicy: IfNotPresent
          env:
            - name: GS_PASSWORD
              value: Gauss@123
          ports:
            - containerPort: 5432
              name: opengauss
          volumeMounts: # 挂载Pod上的卷到容器
            - name: opengauss-persistent-storage # Pod上卷的名字，与“volumes”名字匹配
              mountPath: /var/lib/opengauss  # 挂载的Pod的目录
      volumes:   # 挂载持久卷到Pod
        - name: opengauss-persistent-storage # 持久卷名字， 与“volumMounts”名字匹配
          persistentVolumeClaim: 
            claimName: opengauss-pvc  # 持久卷申请名字
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#创建Deployment
[root@n-k8s-m opengauss]# kubectl create -f opengauss_deploy.yaml

deployment.apps/opengauss-deployment created
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#查看创建Deployment
[root@n-k8s-m opengauss]# kubectl get deploy

NAME                            READY   UP-TO-DATE   AVAILABLE   AGE
opengauss-deployment     1/1                 1            1           110s

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7.创建openGauss的Service提供集群内部和外部的高可用访问
#编写yaml文件

apiVersion: v1
kind: Service
metadata:
  name: opengauss-service
  labels:
    app: opengauss
spec:
  type: NodePort
  selector:
      app: opengauss
  ports:
  - protocol : TCP
    nodePort: 32222
    port: 5432
    targetPort: 5432

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#创建openGauss的Service
[root@n-k8s-m opengauss]# kubectl create -f opengauss_svc.yaml

service/opengauss-service created
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#查看创建Service
[root@n-k8s-m opengauss]# kubectl get svc

NAME                        TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                        AGE
opengauss-service   NodePort    10.101.64.232    <none>        5432:32222/TCP                 6s

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8.连接openGauss数据库
#使用kubectl内部连接数据库
[root@n-k8s-m opengauss]# kubectl get pod

NAME                                                         READY   STATUS        RESTARTS   AGE
opengauss-deployment-6b8b4645f8-bfk4w     1/1     Running       0          15m

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[root@n-k8s-m opengauss]# kubectl exec -it opengauss-deployment-6b8b4645f8-bfk4w sh

kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
sh-4.2# su - omm
[omm@opengauss-deployment-6b8b4645f8-bfk4w ~]$ gsql
gsql ((openGauss 2.0.0 build 78689da9) compiled at 2021-03-31 21:04:03 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.
omm=# \c
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "omm" as user "omm".
omm=# \l
                             List of databases
   Name    | Owner | Encoding |  Collate   |   Ctype    | Access privileges
-----------+-------+----------+------------+------------+-------------------
 omm       | omm   | UTF8     | en_US.utf8 | en_US.utf8 |
 postgres  | omm   | UTF8     | en_US.utf8 | en_US.utf8 |
 template0 | omm   | UTF8     | en_US.utf8 | en_US.utf8 | =c/omm           +
           |       |          |            |            | omm=CTc/omm
 template1 | omm   | UTF8     | en_US.utf8 | en_US.utf8 | =c/omm           +
           |       |          |            |            | omm=CTc/omm
(4 rows)

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#使用pgadmin4外部连接数据库