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I am on Rails 3 with a local Postgres database. What we want to do is replicate the entire database onto a second server in real time. We are thinking of using Octopus.
I’m confused about what model I’m looking for and how the master-slave model applies.
Postgres 9.1 and later comes with streaming replication built in (for master-slave configurations). Check out http://www.postgresql.org/docs/9.2/static/warm-standby.html#STREAMING-REPLICATION for more information on configuration and setup.
There are other third-party solutions for configuration, but I’d start there and see if that meets your needs.