PostgreSQL Installation


To install PostgreSQL, run the following command in the command prompt:


sudo apt-get install postgresql


Once the installation is complete, you should configure the PostgreSQL server based on your needs, although the default configuration is viable.


PostgreSQL supports multiple client authentication methods. IDENT authentication method is used for postgres and local users, unless otherwise configured. Please refer to the PostgreSQL Administrator's Guide if you would like to configure alternatives like Kerberos.

The following discussion assumes that you wish to enable TCP/IP connections and use the MD5 method for client authentication.PostgreSQLconfiguration files are stored in the /etc/postgresql//main directory. For example, if you install PostgreSQL 9.1, the configuration files are stored in the /etc/postgresql/9.1/main directory.

To configure ident authentication, add entries to the /etc/postgresql/9.1/main/pg_ident.conf file. There are detailed comments in the file to guide you.

To enable other computers to connect to your PostgreSQL server, edit the file /etc/postgresql/9.1/main/postgresql.conf

Locate the line #listen_addresses = 'localhost' and change it to:

listen_addresses = '*'

To allow both IPv4 and IPv6 connections replace 'localhost' with '::'

You may also edit all other parameters, if you know what you are doing! For details, refer to the configuration file or to thePostgreSQL documentation.

Now that we can connect to our PostgreSQL server, the next step is to set a password for the postgres user. Run the following command at a terminal prompt to connect to the default PostgreSQL template database:

sudo -u postgres psql template1

The above command connects to PostgreSQL database template1 as user postgres. Once you connect to the PostgreSQL server, you will be at a SQL prompt. You can run the following SQL command at the psql prompt to configure the password for the userpostgres.

ALTER USER postgres with encrypted password 'your_password';

After configuring the password, edit the file /etc/postgresql/9.1/main/pg_hba.conf to use MD5 authentication with the postgresuser:

local   all         postgres                          md5

Finally, you should restart the PostgreSQL service to initialize the new configuration. From a terminal prompt enter the following to restart PostgreSQL:

sudo service postgresql restart

The above configuration is not complete by any means. Please refer to the PostgreSQL Administrator's Guide to configure more parameters.

You can test server connections from other machines by using the PostgreSQL client.

sudo apt-get install postgresql-client
psql -h -U postgres -W 

Replace the domain name with your actual server domain name.


PostgreSQL databases should be backed up regularly. Refer to the PostgreSQL Administrator's Guide for different approaches.

asked Jun 9, 2015 in LINUX by rajesh
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