Install Procedure for PostgreSQL 9.2¶

Requirements¶

To install postgresql you will need the following:

• a installed and supported operating system (e.g. CentOS 7.x)
• root-access
• a fast internet connection

Preliminary Note¶

This procedure is based on a documentation supplied by

• https://www.if-not-true-then-false.com/2012/install-postgresql-on-fedora-centos-red-hat-rhel/
• https://www.linode.com/docs/databases/postgresql/how-to-install-postgresql-relational-databases-on-centos-7/

Install¶

Install postgresql and postgresql-server packages on CentOS 6.x:¶

yum install postgresql postgresql-server postgresql-libs postgresql-contrib postgresql-devel

Configure PostgreSQL 9.2 Database Server¶

Initialize the cluster first with initdb command:

/usr/bin/postgresql-setup initdb

Edit /var/lib/pgsql/data/postgresql.conf file:

vim /var/lib/pgsql/data/postgresql.conf

Set PostgreSQL server to listen all addresses and Change PostgreSQL port (default is 5432). Add/Uncomment/Edit following lines:

...
listen_addresses = '*'
...
port = 5432
...

Edit /var/lib/pgsql/data/pg_hba.conf file:

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

Add (example) your local network with md5 passwords:

...
# Local networks
local    all    all            trust
host    all    all    xx.xx.xx.xx/xx    md5
# Example
host    all    all    10.20.4.0/24    md5
host    all     mes     0.0.0.0/0       md5

manually start PostgreSQL Server:

systemctl start postgresql.service

automatically start the service at boot time:

systemctl enable postgresql.service

you can check the runlevels by

systemctl is-enabled postgresql.service

Change to postgres user:

su - postgres

Create test database (as postgres user):

createdb test

Login test database (as postgres user):

psql test

Create New “testuser” Role with Superuser and Password:

CREATE ROLE testuser WITH SUPERUSER LOGIN PASSWORD 'test';

logout from psql by \q

configure firewall¶

Open PostgreSQL Port (5432) on Iptables Firewall (as root user again)

firewall-cmd --permanent --add-port=5432/tcp --zone=public
firewall-cmd --reload

Usage¶

Test remote connection:

psql -h dbserver -U testuser test

Post Installation Steps¶

DON'T FORGET TO REMOVE testuser BEFORE GOING TO PRODUCTION

dropuser testuser

DON'T FORGET TO SETUP vacuum BEFORE GOING TO PRODUCTION

vacuumdb -a -U postgres -z -v

maybe with a cron-job

OR

as autovacuum is working by default, let's get some log-entries to see it actually working by changing postgres.conf

log_autovacuum_min_duration = 10

you can check the settings of the database by

su - postgres
psql test

psql# show all;