Docker 启动 PostgreSQL 主从架构：实现数据同步

1、准备环境

IP地址	主机名	角色
10.16.12.115	postgresql01	主库
10.16.12.116	postgresql02	从库

3、拉取postgresql镜像

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docker pull registry.cn-hangzhou.aliyuncs.com/qiluo-images/postgres-with-gis:16.4

4、创建db网络

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docker network create --driver bridge dbnet

5、创建数据目录

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mkdir /data/postgresql/data -p
chmod -R 777 /data/postgresql/data

docker-compose.yml文件编写

主库文件:

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sudo tee /data/postgresql/docker-compose.yml <<-'EOF'
version: '3.0'
services:
  postgresql:
    image: registry.cn-hangzhou.aliyuncs.com/qiluo-images/postgres-with-gis:16.4
    restart: always
    container_name: postgresql01
    environment:
      POSTGRES_PASSWORD: admin@123
    working_dir: /postgresql
    networks:
      - dbnet
    ports:
      - "5432:5432"
    volumes:
      - /data/postgresql/data:/var/lib/postgresql/data
 
networks:
  dbnet:
    external: true
EOF

从库文件:

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sudo tee /data/postgresql/docker-compose.yml <<-'EOF'
version: '3.0'
services:
  postgresql:
    image: registry.cn-hangzhou.aliyuncs.com/qiluo-images/postgres-with-gis:16.4
    restart: always
    container_name: postgresql02
    environment:
      POSTGRES_PASSWORD: admin@123
    working_dir: /postgresql
    networks:
      - dbnet
    ports:
      - "5432:5432"
    volumes:
      - /data/postgresql/data:/var/lib/postgresql/data
 
networks:
  dbnet:
    external: true
EOF

启动postgresql服务

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cd /data/postgresql
docker-compose up -d
docker-compose ps

部署主库

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docker exec -it postgresql01 /bin/bash
su - postgres
psql
CREATE ROLE replica login replication encrypted password 'replica@123';

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修改postgresql.conf
vi /data/postgresql/data/postgresql.conf

```bash
listen_addresses = '*'
archive_mode = on
archive_command = '/bin/date'
max_connections = 1024
max_wal_senders = 32
wal_sender_timeout = 60s
wal_keep_size = 16
wal_level = replica

修改pg_hba.conf

vi /data/postgresql/data/pg_hba.conf

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host    replication     replica        0.0.0.0/32        trust

部署从库

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docker exec -it postgresql02 /bin/bash
在容器中运行相关命令：
rm -rf /var/lib/postgresql/data/*

如果退出了，则再次进入

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docker exec -it postgresql02 /bin/bash
su - postgres
pg_basebackup -R -D /var/lib/postgresql/data -P -h 192.168.52.15 -p 5432 -U replica

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docker restart postgresql02 
# 查看/data/postgresql/data下的 postgresql.auto.conf

、查看进程

主机查看主数据库

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ps -ef|grep postgres

从机查看从数据库

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docker ps |grep postgres

测试同步

在主机容器中

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docker exec -it postgresql01 /bin/bash
su - postgres
psql
create database test12;
\list

在从机查看已经同步

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docker exec -it postgresql02 /bin/bash
su - postgres
psql
\list

关闭selinux

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sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
setenforce 0