Create multiple Postgres instances on same machine

Question

To test streaming replication, I would like to create a second Postgres instance on the same machine. The idea is that if it can be done on the test server, then it should be tr

Answer 1

I assume you can work your way out on using postgresql utilities.

Create the clusters

$ initdb -D /path/to/datadb1
$ initdb -D /path/to/datadb2

Run the instances

$ pg_ctl -D /path/to/datadb1 -o "-p 5433" -l /path/to/logdb1 start
$ pg_ctl -D /path/to/datadb2 -o "-p 5434" -l /path/to/logdb2 start

Test streaming

Now you have two instances running on ports 5433 and 5434. Configuration files for them are in data dirs specified by initdb. Tweak them for streaming replication.
Your default installation remains untouched in port 5432.