安装：
# sudo dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm

# sudo dnf -qy module disable postgresql

# sudo dnf install -y postgresql13-server

Dependencies resolved.
================================================================================
 Package                  Arch        Version                 Repository   Size
================================================================================
Installing:
 postgresql13-server      x86_64      13.3-2PGDG.rhel8        pgdg13      5.5 M
Installing dependencies:
 libicu                   x86_64      60.3-2.el8_1            baseos      8.8 M
 postgresql13             x86_64      13.3-2PGDG.rhel8        pgdg13      1.5 M
 postgresql13-libs        x86_64      13.3-2PGDG.rhel8        pgdg13      413 k

Transaction Summary
================================================================================
Install  4 Packages

[root@centos8 ~]# sudo /usr/pgsql-13/bin/postgresql-13-setup initdb
Initializing database ... OK

[root@centos8 ~]# sudo systemctl enable postgresql-13
Created symlink /etc/systemd/system/multi-user.target.wants/postgresql-13.service → /usrrvice.
[root@centos8 ~]# sudo systemctl start postgresql-13

说明：
postgresql-client	libraries and client binaries
postgresql-server	core database server
postgresql-contrib	additional supplied modules
postgresql-devel	libraries and headers for C language development


-- 切换用户 创建用户和数据库：
[root@centos8 ~]# su - postgres
[postgres@centos8 ~]$ psql
psql (13.3)
Type "help" for help.

postgres=# create user root with password 'oracle';
CREATE ROLE

postgres=# create database product owner root;
CREATE DATABASE
postgres=# grant all privileges on database product to root;
GRANT

--退出：
postgres=# \q
postgres=# quit


配置postgresql 可以远程访问：
#添加/修改：在所有IP地址上监听，从而允许远程连接到数据库服务器
# vim /var/lib/pgsql/13/data/postgresql.conf
listening_address:'*'
#listen_addresses = 'localhost'         # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost'; use '*' for all
                                        # (change requires restart)
#port = 5432                            # (change requires restart)
max_connections = 100                   # (change requires restart)

#添加/修改：允许任意用户从任意机器上以密码方式访问数据库，把下行添加为第一条规则：
加入：
# vim /var/lib/pgsql/13/data/pg_hba.conf
host    all           all             0.0.0.0/0                md5

重启服务器：
# sudo systemctl restart postgresql-13