ArcGIS Help 10.1 - Configuring a PostgreSQL database cluster on Linux to accept connections

After you install PostgreSQL, you must configure the database cluster to accept client connections.

PostgreSQL uses a configuration file, pg_hba.conf, to store connection information.

Note:

You may have to add the IP address of the local computer before you can start an ArcSDE service.

Steps:

Make a backup copy of the pg_hba.conf file before you alter it.
If the PostgreSQL postmaster is already running, stop it using the pg_ctl stop command.
Open the pg_hba.conf file in a text editor.
Add the IP addresses of connecting client machines and the client authentication methods used for connections.
For example, to allow any user who supplies a valid password to connect to a database named habitat from addresses beginning with 10.2.12 using an md5 connection, add the following line to the pg_hba.conf file:
```
host habitat all 10.2.12.0/24 md5
```
If you want to allow all users who supply a valid password to connect to any of the databases on the PostgreSQL instance from addresses beginning with 100, you would add a line similar to the following to the pg_hba.conf file:
```
host all all 100.0.0.0/8 md5
```
The preceding examples were for IPV4 addresses. If you need to configure the database cluster to accept connections from machines with an IPV6 address, the format would be as follows:
```
host all all fe60::61f9:1253:c522:9b92%10/128 md5
```
To allow any machines with an address beginning with fe60 to connect, you would add this line to the pg_hba.conf file:
```
host all all fe60::0000:0000:0000:0000%10/8 md5
```
If your PostgreSQL database cluster is set up on a machine that has an IPV6 address and you want machines with an IPV4 address to connect to it, you need to uncomment the following line in the pg_hba.conf file:
```
host all all ::1/128 md5
```
Use pg_ctl to start (or restart) the PostgreSQL postmaster.

8/21/2013