1. 安装postgresql

2. 配置postgresql
   [root@linux3 ~]# postgresql-setup --initdb //初始化数据库

• Initializing database in ‘/var/lib/pgsql/data’
• Initialized, logs are in /var/lib/pgsql/initdb_postgresql.log

[root@linux3 ~]# systemctl enable postgresql.service
Created symlink /etc/systemd/system/multi-user.target.wants/postgresql.service → /usr/lib/systemd/system/postgresql.service.
[root@linux3 ~]# systemctl start postgresql.service

3.创建数据库

cd /usr/bin/
[root@linux3 bin]# psql -U postgres
psql: FATAL: Peer authentication failed for user “postgres”
[root@linux3 bin]# su - postgres
[postgres@linux3 ~]$

[postgres@linux3 ~]$ psql -U postgres
psql (10.17)
Type “help” for help.

postgres=#
postgres=# create d