Update from Sync Service

数据库/PostgreSQL/PostgreSQL安装.md

@@ -1,18 +1,91 @@
-1. ==Install the repository RPM:========yum install== ==https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm==
-2. ==Install the client packages:========yum install postgresql12==
-3. ==Optionally install the server packages:========yum install postgresql12-server==
-4. ==Optionally initialize the database and enable automatic start:========/usr/pgsql-12/bin/postgresql-12-setup initdb========systemctl enable postgresql-12========systemctl start postgresql-12== > 来自 <[https://www.postgresql.org/download/linux/redhat/](https://www.postgresql.org/download/linux/redhat/)>
-[Service]
-Type=notify
+# PostgreSQL 安装
 
-User=postgres
-Group=postgres
+> CentOS 7 安装 PostgreSQL 12
 
-# Note: avoid inserting whitespace in these Environment= lines, or you may
-# break postgresql-setup.
+---
 
-# Location of database directory
-Environment=PGDATA=/var/lib/pgsql/12/data/
+## 安装步骤
 
-初始化之后，数据文件会存在 /var/lib/pgsql/12/data
- > 来自 <[https://www.postgresql.org/download/linux/redhat/](https://www.postgresql.org/download/linux/redhat/)>
+### 1. 安装 RPM 源
+
+```bash
+yum install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
+```
+
+### 2. 安装客户端
+
+```bash
+yum install postgresql12
+```
+
+### 3. 安装服务端
+
+```bash
+yum install postgresql12-server
+```
+
+### 4. 初始化数据库
+
+```bash
+/usr/pgsql-12/bin/postgresql-12-setup initdb
+```
+
+### 5. 启动服务
+
+```bash
+systemctl enable postgresql-12
+systemctl start postgresql-12
+```
+
+---
+
+## 配置
+
+### 数据目录
+
+默认数据目录：`/var/lib/pgsql/12/data/`
+
+### 连接配置
+
+```bash
+sudo -u postgres psql
+```
+
+```sql
+-- 修改 postgres 用户密码
+ALTER USER postgres WITH PASSWORD '你的密码';
+
+-- 允许远程连接
+-- 编辑 pg_hba.conf
+host    all    all    0.0.0.0/0    md5
+
+-- 编辑 postgresql.conf
+listen_addresses = '*'
+```
+
+---
+
+## 常用命令
+
+```bash
+# 启动/停止/重启
+systemctl start postgresql-12
+systemctl stop postgresql-12
+systemctl restart postgresql-12
+
+# 连接数据库
+psql -U postgres -h localhost
+
+# 创建数据库
+createdb mydb
+
+# 备份
+pg_dump -U postgres mydb > backup.sql
+
+# 恢复
+psql -U postgres mydb < backup.sql
+```
+
+---
+
+> 参考：[PostgreSQL 官方安装指南](https://www.postgresql.org/download/linux/redhat/)