High Availability Postgres on Fly

This is a ready to go HA Postgres app that runs on Fly.

Prepare your app

flyctl init

Init gets you going with a Fly application and generates a config file.

Set secrets

This app requires SU_PASSWORD and REPL_PASSWORD environment variables.

SU_PASSWORD is the PostgreSQL super user password, the username is flypgadmin. You can use this to administer the database once it's running. You should create less privileged users for your applications to use.

REPL_PASSWORD is used to replicate between instances.

flyctl secrets set SU_PASSWORD=<PASSWORD> REPL_PASSWORD=<PASSWORD>

Deploy one instance

1. flyctl volumes create pg_data --region ord --size 10
2. flyctl deploy

Add a replica

1. flyctl volumes create pg_data --region ord --size 10
2. flyctl scale count 2

Add a replica in another region

1. flyctl volumes create pg_data --region syd --size 10
2. flyctl scale count 2