If you use the Network Security Toolkit Web User Interface (NST WUI) to setup PostgreSQL, you will have a simple check box which allows you to choose whether or not to enable TCP connections and what systems are permitted to connect.
By default, the setup_postgresql script starts the PostgreSQL database such that it only accepts Unix-domain connections. This means you will not be able to connect to the database from external machines.
To enable the PostgreSQL server to accept TCP connections, you must modify two configuration files and then restart the server.
You must add the -i option to the
/etc/sysconfig/pgsql/postgresql
configuration file which is used to start the server.
Figure 6.1. Configuring PostgreSQL for TCP Connections
PGDATA=/mnt/ram4/var/lib/pgsql/data
PGPORT=5432
PGOPTS="-i"
Simply adding the -i option is not
enough. You must also update
/var/lib/pgsql/data/pg_hba.conf and add
configuration lines indicating what host(s) you wish to permit
access via TCP connections. The following
shows the two lines that need to be added to the end of this
file to enable the localhost and all of the machines on the
192.168.100 network access.
Figure 6.2. Allowing External Hosts To Access PostgreSQL
host all all 127.0.0.1 255.255.255.255 md5 host all all 192.168.100.0 255.255.255.0 md5
Once you've updated the configuration files, you will need to restart the PostgreSQL server.
Figure 6.3. Restarting the PostgreSQL Server
[root@probe root]#/etc/rc.d/init.d/postgresql restartStopping postgresql service: [ OK ] Starting postgresql service: [ OK ][root@probe root]#