Replication using DRBD

In this recipe, we are going to cover block level replication using DRBD for Postgresql.

Getting ready

A working Linux machine is required for this setup. This setup requires network interfaces and the cLusterIP. These steps are carried out in a CentOS version 6 machine. Having covered the PostgreSQL setup in previous chapters, it is assumed that the necessary packages and prerequisites are already installed.

We will be using the following setup in our hierarchy:

• Node1.author.org uses the LAN IP address 10.0.0.181 and uses 172.16.0.1 for crossover

• Node2.author.org uses the LAN IP address 10.0.0.182 and uses the IP address 172.16.0.2 for crossover

• dbip.author.org uses the cluster IP address 10.0.0.180

How to do it...

The following are the steps for block level replication using DRBD:

1. First, temporarily disable SELINUX and set SELINUX to disabled and then save the file:

           vi /etc/selinux/config
           SELINUX=disabled
   

2. In the next step, change the hostname and gateway...