How To Install PostgreSQL 9.3 And phpPgAdmin In CentOS 6.5

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PostgreSQL is a powerful, open-source object-relational database system. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS, Solaris, Tru64), and Windows OS. In this handy tutorial, let us see how to install PostgreSQL on CentOS 6.5 server. This tutorial is same for other RPM based distros like RHEL/Scientific Linux 6.x and Fedora.

Install PostgreSQL

First, add the PostgreSQL repository depending upon your server architecture.

For 32bit:

rpm -Uvh http://yum.postgresql.org/9.3/redhat/rhel-6-i386/pgdg-centos93-9.3-1.noarch.rpm

For 64bit:

rpm -Uvh http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/pgdg-centos93-9.3-1.noarch.rpm

For other distros, head over to the following link and install the relevant repository.

Update the repository list using command:

yum update

Now, Install postgresql with the following command:

yum install postgresql93-server postgresql93-contrib

Initialize postgresql database using following command:

service postgresql-9.3 initdb

Then, start postgresql service and make it to start automatically on every reboot.

/etc/init.d/postgresql-9.3 start
chkconfig postgresql-9.3 on

Next, adjust iptables to access postgresql from outbound.

vi /etc/sysconfig/iptables

Add the following line:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 5432 -j ACCEPT

Save and exit the file. Restart iptables service.

service iptables restart

Access PostgreSQL command prompt

The default database name and database user are “postgres”. Switch to postgres user to perform postgresql related operations:

su - postgres

To login to postgresql, enter the command:

psql

psql (9.3.4)
Type "help" for help.

postgres=#

To exit from posgresql, type \q.

Set “postgres” user password:

Login to postgresql and set postgres password with following command:

postgres=# \password postgres 
Enter new password: 
Enter it again: 
postgres=# \q

To install PostgreSQL Adminpack, enter the command in postgresql prompt:

postgres=# CREATE EXTENSION adminpack;
CREATE EXTENSION

Create New User and Database

For example, here I create a new user called “senthil” with password “centos” and database called “mydb”.

Switch to postgres user with command:

su - postgres

Create user senthil.

$ createuser senthil

Create database:

$ createdb mydb

Set password and Grant access to the database mydb for senthil:

$ psql
psql (9.3.4)
Type "help" for help.

postgres=# alter user senthil with encrypted password 'centos';
ALTER ROLE

postgres=# grant all privileges on database mydb to senthil;
GRANT
postgres=#

Delete Users and Databases

To delete the database, switch to postgres user:

su - postgres

Enter command:

$ dropdb <database-name>

To delete a user, enter the following command:

$ dropuser <user-name>

Configure PostgreSQL-MD5 Authentication

By default, Posgresql uses ident authentication, so that the local system users can be granted access to databases own by them. If you want to set MD5 authentication to require users to enter passwords.

Open up the /var/lib/pgsql/9.3/data/pg_hba.conf file:

vi /var/lib/pgsql/9.3/data/pg_hba.conf

Add or Modify the lines as shown below

[...]
# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     md5
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
host    all             all             192.168.1.0/24          md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
[...]

Restart postgresql service to apply the changes:

/etc/init.d/postgresql-9.3 restart

Configure PostgreSQL-Configure TCP/IP

By default, TCP/IP connection is disabled, so that the users from another computers can’t access postgresql. To allow to connect users from another computers, Edit file /var/lib/pgsql/9.3/data/postgresql.conf:

vi /var/lib/pgsql/9.3/data/postgresql.conf

Find the lines:

[...]
#listen_addresses = 'localhost'
[...]
#port = 5432
[...]

Uncomment both lines and set the IP address of your postgresql server or set “*” to listen from all clients as shown below:

listen_addresses = '*'
port = 5432

Restart postgresql service to save changes:

/etc/init.d/postgresql-9.3 restart

Manage PostgreSQL with phpPgAdmin

phpPgAdmin is a web-based administration utility written in PHP for managing PosgreSQL.

phpPgAdmin is available only in PostgreSQL RPM repository. If you didn’t add PostgreSQL repository, you should add EPEL repository.

Follow the below link to install EPEL repository on CentOS.

Update the repository using command:

yum update

Now, Install phpPgAdmin, enter the following command:

yum install phpPgAdmin httpd

phpPgAdmin is case sensitive. Use upper and lower cases as shown in the above command.

By default, you can access phppgadmin using http://localhost/phpPgAdmin from your local system only. To access remotely, do the following.

Open up the file /etc/httpd/conf.d/phpPgAdmin.conf:

vi /etc/httpd/conf.d/phpPgAdmin.conf

Find the line:

deny from all

And, change it to look like below.

allow from all

Start or Restart Apache service:

service httpd start
chkconfig httpd on

Configure phpPgAdmin

open the file /etc/phpPgAdmin/config.inc.php:

vi /etc/phpPgAdmin/config.inc.php

Find the following line:

$conf['servers'][0]['host'] = '';

Change it as shown below:

$conf['servers'][0]['host'] = 'localhost';

And find the line:

$conf['extra_login_security'] = true;

Change the value to false:

$conf['extra_login_security'] = false;

Find the line:

$conf['owned_only'] = false;

Set the value as true.

$conf['owned_only'] = true;

Save and close the file. Restart postgresql service and Apache services.

/etc/init.d/postgresql-9.3 restart
service httpd restart

Now open your browser and navigate to http://ip-address/phpPgAdmin. You will be pleased when you see the following screen.

phpPgAdmin - Mozilla Firefox_001

Login with users that you’ve created earlier. I already have created a user called “senthil” with password “centos” before, so I log in with user “senthil”.

phpPgAdmin - Mozilla Firefox_002

This is how my phpPgAdmin dashboard looked.

 phpPgAdmin - Mozilla Firefox_003

That’s it. Now you’ll able to perform create, delete and alter databases graphically using phpPgAdmin easily.

For questions please refer to our Q/A forum at : http://ask.unixmen.com/


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