Automate creation of Elastic IPs

[krisdante]

Background

Currently, Elastic IPs are created manually by us and provided as IP in settings.

Need

This process could be updated and a new setting to generate EIP added.

With ec2_eip and ec2_eip_info automation can discover (using tags) the proper EIP and use it or create a new one when required.

[krisdante]

We did not do it yet, because our workflow is as follows:

1. We generate EIP
2. We send EIP do customer and customer assigns it to a domain
3. We start provisioning with the domain already pointing to an IP

But if the domain would be in Route 53 we could update R53 with autogenerated IP.

We could also have a small maintenance playbook just to generate EIP so there is no need to log in to AWS Console.

[pinkeen]

This feature, potentially, suffers from a similar problem as #1 - the newly created EIPs need to be added to project vars (infrastructure configuration). This is a manual step that might be forgotten causing new EIPs to be created on each run.

It'd be best to find a good way to update infrastructure configuration with such runtime generated values.

[krisdante]

EIP supports tags, so instead of putting EIP in settings, we can "find it" by tags.