Letting Ansible manage ssh config
Python Ruby
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README.md

ansible-ssh-config

A module for Ansible for configuring ssh configuration files.

Why?

We have several libraries that carry shared functionality between projects at work. These libraries are on GitHub and they're in their own repo. Our deploy users don't have access to every single repo but only the ones they need to deploy a specific project.

To manage this we have added in fake hostnames to our ~/.ssh/config files on the line of:

Host: internal-lib.github.com
  Hostname: github.com
  IdentityFile: id_rsa.internal-lib

When I started out with Ansible I tried just adding in our lines with lineinfile, but it didn't work out for me since several lines needed to be added.

Usage

The usage is fairly straightforward and it handles the normal use cases of adding, changing and removing hosts from your config file.

- name: Add internal-lib.github.com to ssh config
  ssh_config: host=internal-lib.github.com hostname=github.com
              identity_file=id_rsa.internal-lib port=222 state=present
- name: Remove old-internal-lib.github.com from ssh config
  ssh_config: host=old-internal-lib.github.com state=absent

For the full set of options please look at the top of the module file.

Installation

Note: The module needs to be installed into your library folder for Ansible to pick it up.

Requirements file

Add the following line to your requirements.yml:

- src: gaqzi.ssh-config
  path: library/

Ansible Galaxy

Alternatively install it from Ansible Galaxy by doing:

$ ansible-galaxy install gaqzi.ssh-config -p library/

Your directory structure should then look like this:

.
├── library
│   └── gaqzi.ssh-config
│       ├── CHANGELOG.md
│       ├── library
│       │   └── ssh_config.py
│       ├── meta
│       │   └── main.yml
│       └── README.md
└── site.yml

Manual

Copy ssh_config into the library directory at the root of your Playbook.

.
├── library
│   └── ssh_config
└── site.yml

Credits

For managing the config files I blatantly copied ConfigParser from stormssh and paramiko which implemented all the functionality, but since I want to keep everything in one file to be easily reusable/shareable with Ansible we ended up here.