If you are using the latest version of Ubuntu (8.04 - Hardy Heron), you might find these slightly updated instructions useful.
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'
listen_addresses = '*'
and also change the line:
#password_encryption = on
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. (The following advice can also be given to you – plus you don’t even need to figure out IP addresses and subnet masks – from the latest versions of pgAdmin (1.6.x). However, this is not the version that ships with Ubuntu, so i’ll leave these instructions here.)
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:
# 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. 18.104.22.168). 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. 22.214.171.124 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.