安装

sudo apt install -y postgresql

自动生成一个名为 postgres 的 Linux 系统用户

$ finger postgres
Login: postgres Name: PostgreSQL administrator
Directory: /var/lib/postgresql Shell: /bin/bash
Never logged in.
No mail.
No Plan.
$ groups postgres
postgres : postgres ssl-cert

修改 postgres 系统用户密码

sudo passwd -d postgres
sudo passwd postgres

使用 postgres 用户登录

sudo su - postgress
# 登录 postgresSQL 控制台
psql -U postgres -h localhost
# 设置密码
\password postgres
# 或者
ALTER USER postgres WITH PASSWORD 'pwd';

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