Postgresql installing in ubuntu

This quick walk-through are my notes for installing the PostgreSQL
database server and the PgAdmin administration application on Ubuntu
Linux, and also set up the server so it allows access to other PC’s on
your network.

Before we move on, this guide was tested on the current release of
Ubuntu Linux, (7.10 - Gutsy Gibbon) and PostgreSQL 8.2, but it should
also be applicable to older versions (of Ubuntu and PostgreSQL) and
other Debian based distros.

Right for the basic installation, at the command-line, enter the
following commands (or search for the listed packages in synaptic if
you prefer that way of working):

$ sudo apt-get install postgresql postgresql-client postgresql-contrib
$ sudo apt-get install pgadmin3

This installs the database server/client, some extra utility scripts
and the pgAdmin GUI application for working with the database.

Now we need to reset the password for the ‘postgres’ admin account
for the server, so we can use this for all of the system administration
tasks. Type the following at the command-line (substitute in the
password you want to use for your administrator account):

$ sudo su postgres -c psql template1
template1=# ALTER USER postgres WITH PASSWORD 'password';
template1=# \q

That alters the password for within the database, now we need to do the same for the unix user ‘postgres’:

$ sudo passwd -d postgres
$ sudo su postgres -c passwd

Now enter the same password that you used previously.

Then, from here on in we can use both pgAdmin and command-line
access (as the postgres user) to run the database server. But before
you jump into pgAdmin we should set-up the PostgreSQL admin pack that
enables better logging and monitoring within pgAdmin. Run the following
at the command-line:

$ sudo su postgres -c psql < /usr/share/postgresql/8.2/contrib/adminpack.sql

Finally, we need to open up the server so that we can access and use
it remotely - unless you only want to access the database on the local
machine. To do this, first, we need to edit the postgresql.conf file:

$ sudo gedit /etc/postgresql/8.2/main/postgresql.conf

Now, to edit a couple of lines in the ‘Connections and Authentication’ section…

Change the line:

#listen_addresses = 'localhost'

to

listen_addresses = '*'

and also change the line:

#password_encryption = on

to

password_encryption = on

Then save the file and close gedit.

Now for the final step, we must define who can access the server. This is all done using the pg_hba.conf file.1

$ sudo gedit /etc/postgresql/8.2/main/pg_hba.conf

Comment out, or delete the current contents of the file, then add this text to the bottom of the file:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

# DO NOT DISABLE! # If you change this first entry you will need to make sure that the # database # super user can access the database using some other method. # Noninteractive # access to all databases is required during automatic maintenance # (autovacuum, daily cronjob, replication, and similar tasks). # # Database administrative login by UNIX sockets local all postgres ident sameuser # TYPE DATABASE USER CIDR-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 # IPv6 local connections: host all all ::1/128 md5 # Connections for all PCs on the subnet # # TYPE DATABASE USER IP-ADDRESS IP-MASK METHOD host all all [ip address] [subnet mask] md5

and in the last line, add in your subnet mask (i.e. 255.255.255.0)
and the IP address of the machine that you would like to access your
server (i.e. 138.250.192.115). However, if you would like to enable
access to a range of IP addresses, just substitute the last number for
a zero and all machines within that range will be allowed access (i.e.
138.250.192.0 would allow all machines with an IP address 138.250.192.x
to use the database server).

That’s it, now all you have to do is restart the server:

$ sudo /etc/init.d/postgresql-8.2 restart

And all should be working.

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