Example Salt states for provisioning the infrastructure of a REST API implemented in Python with SQL persistence.

The DB used is PostgreSQL and runs in a single machine.

The API runs on a single machine.

The API uses the database from the DB machine.

The API is configured as a WSGI application and executed by gunicorn.

The gunicorn instance is watched by the supervisor service.

Nginx runs as a reverse proxy of gunicorn.

Salt runs on:

• A Salt master machine
• The REST API machine (running a Salt minion)
• The DB machine (running a Salt minion)

• Python
• Ruby
• A VM Manager, either: ** VirtualBox or ** libvirt with vagrant-libvirt Vagrant plugin installed(vagrant plugin install vagrant-libvirt)
• Vagrant

The Vagrantfile already exist in this project. In order to create the VMs execute:

vagrant up

When finished working on this project, execute:

vagrant destroy -f

file_roots is set to directory saltstack/salt and pillar_roots to saltstack/pillar, both settings defined in saltstack/etc/master

Log into Salt master:

vagrant ssh master

Change to root user:

sudo su

Accept the keys of Salt minions:

salt-key -A

Provision all minions:

salt '*' state.apply

All the actions described below are performed automatically by Salt during provision.

The application code is cloned from a Github repository into a local directory.

The application relies on an .env file, which is filled with information read by Salt from Pillar and Mine.

Salt Pillar contains DB credentials.

Salt Mine provides the IP address of each machine, in particular the IP address of the DB server. Salt uses the DB IP address informed by Mine and fills the DB host parameter in the .env file.