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ansible-starter

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Ansible Playbooks Starter Kit

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# Ansible Starter Kit

This Ansible Playbooks Starter Kit is a collection of ideas and best practices in organizing and using Ansible. I used Ansible for several projects in many companies and stumbled across different approaches to organize all the mess. This is the essence of my learnings so I won't forget it.

This repo only includes two roles for demonstration purposes. I maintain a repository with my essential
roles in another repository. (That can be includes in `ansible.cfg`.)

## Installation

You need a working Python installation and `pip` installed.

```bash
pip install -r requirements.txt
```

## Usage

I add every host to at least one group in `ansible_hosts`. This can be cluster groups (e.g. consul-servers) or groups for a special purpose (e.g. streaming-servers).

Every role has a group too (e.g. role `apache` to install Apache on a server). So I can add hosts or groups to a group that belong to a specific role to execute the tasks of this role on this hosts.

Assume a group `webservers` with 4 hosts in `ansible_hosts` and a group `workers`:

```yaml
[webservers]
web1 ansible_host=web1.servers.local primary_ipv4=192.168.1.1
web2 ansible_host=web2.servers.local primary_ipv4=192.168.1.2
web3 ansible_host=web3.servers.local primary_ipv4=192.168.1.3
web4 ansible_host=web4.servers.local primary_ipv4=192.168.1.4

[workers]
worker1 ansible_host=worker1.servers.local primary_ipv4=192.168.2.1
```

(I use short names like `web1` and explicitly set a long name with `ansible_host`. The variable `primary_ipv4` is no official Ansible variable like `ansible_host`. But it's often a good choice to see the IP address of a host at frist sight and I use it in some roles.)

If I need to install Aapche on all webservers and worker hosts I add them to the `apache` group:
```yaml
[apache:children]
webservers
workers
```

In `site.yaml` every role gets an entry like this:

```yaml

- name: Install Apache
  hosts: apache
  become: yes
  gather_facts: yes
  strategy: free
  roles:
  - { role: apache, tags: ['apache'] }

```

After that it's easy to work on a specific host or group:

```bash
ansible-playbook site.yaml --limit webservers
````

Or execute a specific tag like `apache`:

```bash
ansible-playbook site.yaml --tags "apache"
````

If you need to set variables for groups or hosts create a folder with the name of the group in `group_vars` or of the host in `host_vars`. Put YAML files with your settings in these folders.

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