PostgreSQL 12 6 in the mounting CentOS

Preparing the Environment

project	parameter
operating system	CentOS 6
RAM	2GB
hard disk	10GB
PostgreSQL version	12

CentOS installation

All normal installation, what system do anything special package of choice.
note : Alone should be noted that virtual network configurations confidential select NET network mode.

Download PostgreSQL

I do not know why this method is online, I would not life and death

So I look for other ways to use CentOS directly in the browser to access PostgreSQL's official website, there is a Direct RPM downloadword, find the following interface, download the rpm package in CentOS in:

Install and configure PostgreSQL

Sequentially according to the order must necessarily must follow several packages:

rpm -ivh  postgresql12-libs-12.2-1PGDG.rhel6.x86_64.rpm
rpm -ivh  postgresql12-12.2-1PGDG.rhel6.x86_64.rpm
rpm -ivh postgresql12-server-12.2-1PGDG.rhel6.x86_64.rpm

PostgreSQL initialization

The following command to initialize the database, need to see [OK]

[root@pg01 ~]#  service postgresql-12 initdb

Start the database

[root@pg01 ~]#  service postgresql-12 start

Check if the database start

[root@pg01 ~]# ps -ef | grep postgre
postgres  1825     1  0 16:24 ?        00:00:00 /usr/pgsql-12/bin/postmaster -D /var/lib/pgsql/12/data
postgres  1827  1825  0 16:24 ?        00:00:00 postgres: logger                                      
postgres  1829  1825  0 16:24 ?        00:00:00 postgres: checkpointer                                
postgres  1830  1825  0 16:24 ?        00:00:00 postgres: background writer                           
postgres  1831  1825  0 16:24 ?        00:00:00 postgres: walwriter                                   
postgres  1832  1825  0 16:24 ?        00:00:00 postgres: autovacuum launcher                         
postgres  1833  1825  0 16:24 ?        00:00:00 postgres: stats collector                             
postgres  1834  1825  0 16:24 ?        00:00:00 postgres: logical replication launcher                
root      2253  2233  0 16:25 pts/0    00:00:00 grep postgre

Database random start

chkconfig postgresql-12 on

Close the database

[root@pg01 ~]# service postgresql-12 stop

Configuration of users

• PostgresSQL after installation automatically creates the user postgres, no password
• When switching occurs -bash-4.1 $ faults, this is due to the postgres account is installed yum or rpm database is created automatically when the user, the lack of user environment variable file, use cp /etc/skel/.bash* ~ copy the template to the current user , log on again.

[root@pg01 ~]# su - postgres
-bash-4.1$ cp /etc/skel/.bash* ~
-bash-4.1$ exit
[root@pg01 ~]# su - postgres
[postgres@pg01 ~]$