How to Install and Connect to PostgreSQL on CentOS 7

Step 1: Add the PostgreSQL 9.3 Repository

In this case we want to install PostgreSQL 9.3 directly from the Postgres repository. Let’s add that repo:

rpm -iUvh http://yum.postgresql.org/9.3/redhat/rhel-7-x86_64/pgdg-centos93-9.3-1.noarch.rpm


Step 2: Install PostgreSQL

First, you’ll follow a simple best practice: ensuring the list of available packages is up to date before installing anything new.

yum -y update


Then it’s a matter of just running one command for installation via apt-get:

yum -y install postgresql93 postgresql93-server postgresql93-contrib postgresql93-libs --disablerepo=* --enablerepo=pgdg93


PostgreSQL should now be installed.

Step 3: Start PostgreSQL

Configure Postgres to start when the server boots:

systemctl enable postgresql-9.3


Start Postgres:

/usr/pgsql-9.3/bin/postgresql93-setup initdb

systemctl start postgresql-9.3


Step 4: Switch to the Default PostgreSQL User

As part of the installation Postgres adds the system user postgres and is setup to use “ident” authentication. Rolesinternal to Postgres (which are similar to users) match with a system user account.


Let’s switch into that system user:

su – postgres


And then connect to the PostgreSQL terminal (in the postgres role):

psql


That’s it! You’re connected and ready to run commands in PostgreSQL as the postgres role. In future (Sept 2014) articles we’ll delve into creating new roles, changing a role’s password, creating/deleting databases, backups, etc.

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