consul-template-dc-failure

A simple ansible playbook which demonstrates how to handle the failure of a consul datacenter (in a distributed WAN setup) by using a plugin.

Execution

$ ansible-playbook -i localhost site.yml

Basics

This playbook:

1. Sets up a 3 datacenter consul setup:

• alpha
• beta
• gamma

2. Runs consul-template and validates that all 3 datacenters are mentioned in the outputted template.

3. Stops 2 of the 3 servers in the beta datacenter (thereby causing the cluster to lose consensus).

4. Runs consul-template and validates that the alpha and gamma dataceters are mentioned in the outputted template, and that the beta datacenter is not present in the outputted template.