Install PostgreSQL on CentOS

Installation
Rangson Sangboonruang
rangson.sng@gmail.com
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https://www.youtube.com/watch?v=yTsirtODBX8
You can find video demonstration on YouTube

 Update repository
 Creating a user group of sudoers
 Putting sudogroup in sudoer file
 Installing Postgresql
 Starting Postgresql Server
 Editing configuration files
 Connecting from local computer
 Connecting from other computers
 Configuring the firewall
Things to be covered
Installation of Postgresql on CentOS
Postgresql Sever 9.1 and CentOS 6.5
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It is assumed that you already had CentOS
Installed. Let’s log on to CentOS.
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Updating repository
ls
- Download pgdg-redhat91-9.1-5.noarch.rpm from this urlo –
http://yum.pgrpms.org/9.1/redhat/rhel-6-x86_64/pgdg-redhat91-9.1-5.noarch.rpm
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- Place the file in your preferred directory, e.g. /tmp.
- Open Terminal window and go to /tmp.
cd /tmp
- List all the files in the directory to ensure that pgdg-
redhat91-9.1-5.noarch.rpm is already there.
- The screen shall display something like the following.
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- Try updating repository.
rpm –Uvh pgdg-redhat91-9.1-5.noarch.rpm
Explanation:
You get this permission denied message because the user
you are logging on is not a privileged user. You can log
on using root but using root is not recommended because
root is super powerful and accidental damage can
potentially happen using root to perform admin tasks. On
CentOS you can use sudo to obtain supper user privilege
and the command will be like the following.
sudo rpm –Uvh pgdg-redhat91-9.1-5.noarch.rpm
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Explanation:
You get this message because the user you are using is not
listed in sudoers file. It is recommended that you create
a group called sudogroup (or anything you like) and add
the user you are using to this group and put the whole
group in sudoer file. To do all these, follow the
following steps.
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Creating a user group of sudoers
- From the menu bar choose System>Administration>Users and
Groups and you’ll be prompted to enter root’s password.
- For those you are familiar with Linux command line, you
can ignore this and perform the geek stuff.
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- Now, you should see User Manager window. Click Add
Group button and enter the group name then click OK.
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- Add your current user to “sudogroup” by choosing “Users”
tab, click Properties button (as highlighted). You
should see User Properties window. In the list box
scroll to the “sudogroup” and have it checked. Do not
forget to specify the Primary Group as “sudogroup”.
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Putting sudogroup in sudoer file
- Go back to Terminal window and type the following
command.
su root
Explanation:
“su” is used to switch user from one to another. Now you
are root. This is because to edit sudoer file you need
root’s privilege. Next command is as followed.
visudo
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Explanation:
The Terminal window is now a text editor called “vi”. Now
go through these steps
- Locate the cursor to the line that looks like
“root ALL=(ALL) ALL”.
- Press “i” on your keyboard insert text.
- Put “$sudogroup ALL=(ALL) ALL” underneath.
- Press “esc” on your keyboard then type :wq
- Press “Enter”
Explanation:
You have just exited the vi editor and are ready to
proceed the next step by typing the following command.
sudo rpm –Uvh pgdg-redhat91-9.1-5.noarch.rpm
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Explanation:
After running the previous command you should receive the
response like the above.
- Run the following command to list all available
Postgresql packages.
yum list postgresql*
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Installing Postgresql
Explanation:
Among all the listed packages the highlighted one is what
we are about to use for our installation.
- Type the following command
sudo yum install postgresql91-server.x86_64
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Explanation:
After running yum install you should see the screen like
the above and you’ll be prompted to say y (for yes) or n
(for no) to proceed downloading the package and finish
the installation.
- Type y for now and wait until the screen displays
“Complete!”
Explanation:
Now you have done with the installation. Next, let’s move
on to the next slide.
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Starting Postgresql Server
- Type the following command.
sudo service postgresql-9.1 start
Starting the server FAILED because you need to initialize
the database first. So let’s do it by typing the following
command.
sudo service postgresql-9.1 initdb
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You are supposed to see the following screen.
Now try starting the server again. This time you should
see the following screen.
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Editing configuration files
- Type the following command to edit postgresql.conf
sudo vi /var/lib/pgsql/9.1/data/postgresql.conf
- Edit the file by changing these two lines:
Uncomment by removing #, and
Change from ‘localhost’ to ‘*’
Uncomment
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- Type the following command to edit pg_hba.conf
sudo vi /var/lib/pgsql/9.1/data/pg_hba.conf
- Edit the file by changing these two lines:
Before
After
Insert
new
line
Change from
“indent” to
“md5”
The new line added contains the network address of you machine. This is to allow other
computer to connect to your sever.
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- Type the following command to restart the server.
sudo service postgresql-9.1 restart
- If successful you should see the following.
- Type the following command to test your server.
sudo su postgres
createdb test
psql test
Explanation:
You should see this screen after running
the command above.
sudo su postgres => To switch to user
postgres
createdb test => To create a database
called test
psql test => To login to test database
<<Successful screen>>
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Connecting from local computer
- Type the following command to crate a role for the
database.
CREATE ROLE testuser WITH SUPERUSER LOGIN PASSWORD ‘test’;
- Type the following command to test the connection to the
server.
psql -h localhost –U testuser test
- Type the following command to exit test database
q
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Connecting from other computers
Explanation:
I used pgAdmin III to connect to the Postgresql Server.
And, first, failed to connect saying the server was not
listening on port 5432. Of cause, there is something you
have to do with the server.
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Configuring the firewall (iptables)
- Type the following command to exit test database
q
- Type the following command to exit from postgres
exit
9
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- Type the following command to edit iptables
sudo vi /etc/sysconfig/iptables
Insert this line
(before –A INPUT –j
Reject….).
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- Type the following command to edit restart the firewall
sudo service iptables restart
- Try connecting to the server from other computer again.
This time you
should be able
to connect to
the server.
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Install PostgreSQL on CentOS

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