安装Postgres14到Centos7

1. Install from postgresql.org

$ 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 postgresql14-server
$ rpm -qa | grep postgres
postgresql14-libs-14.9-2PGDG.rhel7.x86_64
postgresql14-14.9-2PGDG.rhel7.x86_64
postgresql14-server-14.9-2PGDG.rhel7.x86_64

$ sudo systemctl enable postgresql-14
Created symlink from /etc/systemd/system/multi-user.target.wants/postgresql-14.service to /usr/lib/systemd/system/postgresql-14.service.

2. Start postgres

$ sudo systemctl start postgresql-14
$ netstat -ltpn | grep postmaster
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      15087/postmaster    
tcp6       0      0 ::1:5432 

3. Change password of postgress user

$ sudo su - postgres
$ psql
=# alter user postgres with password 'postgres';
ALTER ROLE

4. Change configruation for remote access

$ cd /var/lib/pgsql/14/data
$ diff -u postgresql.conf.orig postgresql.conf
--- postgresql.conf.orig	2023-11-05 09:22:02.995785902 +0800
+++ postgresql.conf	2023-11-05 10:00:15.168884636 +0800
@@ -57,7 +57,7 @@
 
 # - Connection Settings -
 
-#listen_addresses = 'localhost'		# what IP address(es) to listen on;
+listen_addresses = '*'		# what IP address(es) to listen on;
 					# comma-separated list of addresses;

$ diff -u pg_hba.conf.orig pg_hba.conf
--- pg_hba.conf.orig	2023-11-05 09:22:02.995785902 +0800
+++ pg_hba.conf	2023-11-05 10:00:15.169884642 +0800
@@ -85,6 +85,7 @@
 local   all             all                                     peer
 # IPv4 local connections:
 host    all             all             127.0.0.1/32            scram-sha-256
+host    all             all             0.0.0.0/0               scram-sha-256
 # IPv6 local connections:
 host    all             all             ::1/128                 scram-sha-256

Then logoff postgres user and restart db service

$ exit
$ sudo systemctl restart postgresql-14
$ psql -hcentos5 -dpostgres -Upostgres # to access db on centos5 remotely 
Password for user postgres: 
psql (14.9)
Type "help" for help.

postgres=# 

5. create (and drop) database if need

postgres=# create database manga;
CREATE DATABAS
postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
-----------+----------+----------+-------------+-------------+-----------------------
 manga     | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
...

postgres=# \c manga
You are now connected to database "manga" as user "postgres".
manga=#

postgres=# drop database manga;
DROP DATABASE

6. create a user "manga" and grant it privileges of default database "postgres"

postgres=# create user manga with password 'manga';
CREATE ROLE
postgres=# \du
postgres=# grant all privileges on database postgres to manga;
postgres=# \q

7. create a schema "manga" and a table "fruit" by using new user "manga"

$ psql -hcentos5 -dpostgres -Umanga 
Password for user manga: 
psql (14.9)
Type "help" for help.

postgres=> create schema manga;
CREATE SCHEMA
postgres=> \dn
  List of schemas
  Name  |  Owner   
--------+----------
 manga  | manga
 public | postgres
(2 rows)

postgres=> CREATE TABLE fruit (
  fruit_id smallint NOT NULL,
  name varchar(10) NOT NULL UNIQUE,
  price float NOT NULL,
  PRIMARY KEY (fruit_id)
);
CREATE TABLE
postgres=> \d
       List of relations
 Schema | Name  | Type  | Owner 
--------+-------+-------+-------
 manga  | fruit | table | manga
(1 row)

postgres=> INSERT INTO fruit VALUES (101,'',800),(102,'',150),(103,'',120),(104,'',200),(105,115),(106,'',110);
INSERT 0 6

postgres=> select * from fruit;
 fruit_id | name | price 
----------+------+-------
      101 |     |   800
      102 |     |   150
      103 |     |   120
      104 |     |   200
      105 |     |   115
      106 |     |   110
(6 rows)