centos7安装postgresql12

PS：不同系统安装不同postgresql版本，参考PostgreSQL: Downloads

1.编辑安装postgresql脚本

# vim install_postgresql.sh
sudo yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
sudo yum install -y postgresql12-server
sudo /usr/pgsql-12/bin/postgresql-12-setup initdb
sudo systemctl enable postgresql-12
sudo systemctl start postgresql-12

2.运行安装postgresql脚本

# bash install_postgresql.sh
...
已安装:
  postgresql12-server.x86_64 0:12.15-1PGDG.rhel7                                                                                                                        

作为依赖被安装:
  postgresql12.x86_64 0:12.15-1PGDG.rhel7                                          postgresql12-libs.x86_64 0:12.15-1PGDG.rhel7                                         

完毕！
Initializing database ... OK

3.验证postgresql 5432端口是否打开

# ss -ntl|grep 5432
LISTEN     0      128    127.0.0.1:5432                     *:*                  
LISTEN     0      128      [::1]:5432                  [::]:*                  

4.运行命令postgresql查看版本

# sudo -u postgres psql -c "SELECT version();"
could not change directory to "/root": 权限不够
                                                 version                                                  
----------------------------------------------------------------------------------------------------------
 PostgreSQL 12.15 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit
(1 row)

5.切换postgres用户，运行psql工具

# su - postgres
# psql
psql (12.15)
输入 "help" 来获取帮助信息.

postgres=#