Centos8安装PostgreSQL

一、前言

官网地址：https://www.postgresql.org/download/linux/redhat/

二、安装

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

# Disable the built-in PostgreSQL module:
sudo dnf -qy module disable postgresql

# Install PostgreSQL:
sudo dnf install -y postgresql13-server

# Optionally initialize the database and enable automatic start:
sudo /usr/pgsql-13/bin/postgresql-13-setup initdb
sudo systemctl enable postgresql-13
sudo systemctl start postgresql-13

过程中如果出现错误，请执行：sudo dnf install wget

三、配置

# 切换成 postgres 用户
sudo -i -u postgres

password

四、远程访问

cd /var/lib/pgsql/13/data
vim pg_hba.conf

1、修改pg_hba.conf，添加一行到IPv4

host    all             all             0.0.0.0/0            scram-sha-256

2、修改postgresql.conf

　　取消#listen_addresses = 'localhost'注释

　　修改为listen_addresses = '*'

3、重启

systemctl restart postgresql-13.service 

五、其他

1.查看当前连接数

select count(1) from pg_stat_activity;

2.查看最大连接数

show max_connections;

3.设置最大连接数

cd /var/lib/pgsql/13/data

vim postgresql.conf

max_connections = 1000