Ansible Primer Repo
This is my ansible primer repository that I've put together to reference when I need it.
This example includes a ansible role called "promtail-for-linux" wich installs the grafana promtail agent on 3 nodes, which is grouped into 3 groups:
[prod] prod.example.com[staging] staging.example.com[dev] dev.example.com
It requires a Grafana Loki server, but it's beyond the scope of this example.
The directory structure generated with tree:
.
├── EXTRAS.md
├── README.md
├── ansible.cfg
├── group_vars
│ ├── dev
│ │ └── vars
│ ├── prod
│ │ └── vars
│ └── staging
│ └── vars
├── host_vars
│ ├── dev.example.com
│ │ └── vars
│ ├── prod.example.com
│ │ └── vars
│ └── staging.example.com
│ └── vars
├── hosts
├── playbooks
│ └── promtail.yml
└── roles
└── promtail-for-linux
├── defaults
│ └── main.yml
├── files
│ └── promtail.service
├── handlers
│ └── main.yml
├── tasks
│ ├── main.yml
│ └── task-ubuntu.yml
├── templates
│ └── linux-promtail-config.yml.j2
└── vars
└── main.yml
17 directories, 18 filesVariable Precendence (only the ones I'm interested in - see the docs at the bottom for a detailed overview):
1. Role defaults (<role-name>/defaults/main.yml)
2. Inventory file or script group vars
3. Playbook group_vars
4. Playbook host_vars
5. Role vars (defined in <role-name>/vars/main.yml)
6. Task vars (only for the task)
7. Extra vars (-e "foo=bar") (always win precedence)