kubernetes集群部署postgre 12.6数据库服务

背景：

因业务上线需要，研发中心要求在kubernetes测试集群部署一个postgre 12.6的数据库，用于业务功能调试。

一、实施部署postgre数据库： 

1、拉取postgre 12.6的镜像：

[root@harbor-02 ~]# docker pull registry.cn-hangzhou.aliyuncs.com/images-speed-up/postgres:12.6
2017-latest: Pulling from mssql/server
699451820735: Pull complete 
861e6e6e8e5e: Pull complete 
4403d783b046: Pull complete 
Digest: sha256:3b913841850a4d57fcfcb798be86acc88ea0f2acc5478bc0c140a43e91c4a545
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/images-speed-up/postgres:12.6

2、上传postgre 12.6镜像到私库：

先tag处理一下。

[root@harbor-02 ~]# docker tag registry.cn-hangzhou.aliyuncs.com/images-speed-up/postgres:12.6 dockerhub.jiang.com/jiang-public/postgres:12.6

再上传到私有harbor库

[root@harbor-02 ~]# docker push dockerhub.jiang.com/jiang-public/postgres:12.6
The push refers to repository [dockerhub.jiang.com/jiang-public/postgres]
fdfec26b634f: Pushed 
ef3ecb9d5e46: Pushed 
548a79621a42: Pushed 
2017-latest: digest: sha256:ff8a63a2c900cf3201b9485267ff804db58fbeaed83287c94edd3b3359708854 size: 954

3、创建PersistentVolume、PersistentVolumeClaim存储：

因kubernetes集群环境是对接了hpe（华三）的iscsi存储，所以直接通过stoageclass创建pvc存储即可。不过这里会展示pv、pvc存储的yml配置内容。

pvc存储yml配置：

apiVersion: storage.k8s.io/v1
kind: PersistentVolumeClaim
metadata:name: postgre-db-pvcnamespace: main-data-testselfLink: /api/v1/namespaces/main-data-test/persistentvolumeclaims/postgre-db-pvcannotations:boundinfo: >-[{"podName":"postgre-db-nrzqq-664c5d78c7-ms4t5","containerName":"postgre","volumeMount":{"name":"postgre-db-pvc","mountPath":"/var/lib/postgresql/data"}}]pv.kubernetes.io/bind-completed: 'yes'pv.kubernetes.io/bound-by-controller: 'yes'system/support-expansion: 'true'volume.beta.kubernetes.io/storage-provisioner: csi.hpe.comfinalizers:- kubernetes.io/pvc-protection
spec:accessModes:- ReadWriteOnceresources:requests:storage: 10GivolumeName: pvc-5fdfd0ae-4c77-423b-87f0-991508b76f60storageClassName: hpe-sanvolumeMode: Filesystem
status:phase: UsedaccessModes:- ReadWriteOncecapacity:storage: 10Gi

4、创建无状态的postgre数据库：

这里的无状态就是deployment控制器的配置。

kind: Deployment
metadata:name: postgre-db-nrzqqnamespace: main-data-testgeneration: 1labels:app: postgre-db-nrzqqname: postgre-dbversion: v1annotations:deployment.kubernetes.io/revision: '1'sidecar.istio.io/inject: 'false'
spec:replicas: 1selector:matchLabels:app: postgre-db-nrzqqname: postgre-dbtemplate:metadata:labels:app: postgre-db-nrzqqname: postgre-dbversion: v1annotations:cni.projectcalico.org/ipv4pools: '["172.25.0.0/16"]'sidecar.istio.io/inject: 'false'system/container-registry-map: '{"postgre":"default"}'system/registry: defaultv1.multus-cni.io/default-network: kube-system/calico@eth0spec:volumes:- name: postgre-db-pvcpersistentVolumeClaim:claimName: postgre-db-pvccontainers:- name: postgreimage: 'dockerhub.jiang.com/jiang-public/postgres:12.6'ports:- containerPort: 5432protocol: TCPenv:- name: POSTGRES_USERvalue: postgres- name: POSTGRES_PASSWORDvalue: postgres- name: POSTGRES_DBvalue: postgres- name: TZvalue: Asia/Shanghai- name: POSTGRES_MAX_CONNECTIONSvalue: '20000'resources:limits:cpu: '2'memory: 4Girequests:cpu: '1'memory: 1GivolumeMounts:- name: postgre-db-pvcmountPath: /var/lib/postgresql/dataterminationMessagePath: /dev/termination-logterminationMessagePolicy: FileimagePullPolicy: IfNotPresentsecurityContext:privileged: falserestartPolicy: AlwaysterminationGracePeriodSeconds: 30dnsPolicy: ClusterFirstserviceAccountName: defaultserviceAccount: defaultsecurityContext: {}strategy:type: RecreateminReadySeconds: 10revisionHistoryLimit: 10progressDeadlineSeconds: 600

1、volumes存储的声明：

2、volumeMounts:存储的挂载

3、env：环境变量的声明

            - name: POSTGRES_USER（postgre的用户）
              value: postgres
            - name: POSTGRES_PASSWORD（postgre用户的密码）
              value: postgres
            - name: POSTGRES_DB（postgre数据库的库名称）
              value: postgres
            - name: TZ（时区）
              value: Asia/Shanghai
            - name: POSTGRES_MAX_CONNECTIONS（postgre的连接数）
              value: '20000'

4、ports：端口的声明

        这里默认的是5432

5、创建servcie控制器配置，对外提供访问：

kind: Service
metadata:name: postgre-dbnamespace: main-data-testselfLink: /api/v1/namespaces/main-data-test/services/postgre-dblabels:name: postgre-dbsystem/appName: master-data-baseannotations:binding_domains: ''system/https: 'false'system/lbgroup: group-dgdxwsystem/ruleComment: ''system/ruleName: postgre-db-outsystem/schemaPortname: tcp-port-0/TCP/21951
spec:ports:- name: tcp-port-0protocol: TCPport: 5432targetPort: 5432selector:name: postgre-dbclusterIP: 172.37.137.21type: ClusterIPsessionAffinity: None

二、使用Navicat Premium连接：

可以直接通过 Navicat Premium 来连接postgre数据库。

登陆之后可以检查一下postgre的数据库名是否存在，进行测试一下。

 注：到此，在kubernetes集群上部署postgre数据库就完成了。希望可以帮助到大家。