High Availability PostgreSQL with Patroni and HAproxy Cluster. Patroni is a tool for setting up PostgreSQL servers in high-availability configuration steps. It is written in Python and available on PyPi.

Sphinx-autobuild is a handy extension to have when producing documentation and want to check how it appears right away after making a change.

Haproxy cluster with Keepalived Installation Guide!, HAProxy is a free, open source HA load balancer and proxy server for TCP and HTTP-based applications that distributes requests across many servers with high availability. The connection is forwarded by HAProxy to whatever node is the master at the time.