Main motivation here is to have a cheap and simple Postgres Database server with backups, but without the failover. And in order to get cheap (in terms of memory) connections - use the PgBouncer. Why without the failover? Because in my case I didn't need a 100% stable cluster, but I needed a cheap and simple solution, which in case of disaster could be recovered in some X hours. If you are looking for a failover cluster - there is nice automation here: https://github.com/vitabaks/postgresql_cluster
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