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110 lines
3.9 KiB
Markdown
110 lines
3.9 KiB
Markdown
# Ansible
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Ansible playbooks, roles, modules, etc will come here. This wiki will reflect the layout, structure, and potential standards that should be followed when making playbooks and roles.
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Each playbook should have comments or a name descriptor that explains what the playbook does or how it is used. If not available, README-... files can be used in place, especially in the case of adhoc playbooks that take input. Documentation for each playbook/role does not have to be on this wiki. Comments or README's should be sufficient.
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## Management Node Structure
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Loosely copied from the CentOS ansible infrastructure.
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```
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.
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├── ansible.cfg
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├── files -> playbooks/files
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├── handlers -> playbooks/handlers
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├── inventory
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├── pkistore
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├── playbooks
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│ ├── files
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│ ├── group_vars
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│ ├── host_vars
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│ ├── handlers
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│ ├── tasks
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│ ├── templates
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│ ├── vars
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│ └── requirements.yml
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├── roles
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│ └── <role-name>
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├── tasks -> playbooks/tasks
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├── templates -> playbooks/templates
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└── vars -> playbooks/vars
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```
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## Structure
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What each folder represents
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```
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files -> As the name implies, non-templated files go here. Files that are
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dropped somewhere on the file system should be laid out in a way
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that represents the file system (eg. ./etc/sysconfig/)
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group_vars -> Group Variables go here if they are not fulfilled in an inventory.
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Recommended that group_vars be used over inventory vars.
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host_vars -> Host variables go here
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inventory -> All static inventories go here
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roles -> Custom roles can go here
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tasks -> Common tasks come here
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templates -> Templates go here
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vars -> Global variables that are called with vars_files go here. This
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```
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## Current Playbook Naming
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```
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init-* -> Starting infrastructure playbooks that run solo or import other
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playbooks that start with import-
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adhoc -> These playbooks are one-off playbooks that can be used on the CLI or
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in AWX. These are typically for basic tasks.
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import -> Playbooks that should be imported from the top level playbooks
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role-* -> These playbooks call roles specifically for infrastructure tasks.
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Playbooks that do not call a role should be named init or adhoc based
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on their usage.
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```
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## Designing Playbooks
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### Pre flight and post flight
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At a minimum, there should be `pre_tasks` and `post_tasks` that can judge whether ansible has been can or has been run on a system. Some playbooks will not necessarily need this (eg if you're running an adhoc playbook to create a user). But operations done on a host should at least have these in the playbook, with an optional handlers include.
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```
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handlers:
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- include: handlers/main.yml
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pre_tasks:
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- name: Check if ansible cannot be run here
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stat:
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path: /etc/no-ansible
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register: no_ansible
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- name: Verify if we can run ansible
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assert:
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that:
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- "not no_ansible.stat.exists"
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msg: "/etc/no-ansible exists - skipping run on this node"
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# Import roles/tasks here
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post_tasks:
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- name: Touching run file that ansible has ran here
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file:
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path: /var/log/ansible.run
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state: touch
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```
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### Comments
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Each playbook should have comments or a name descriptor that explains what the playbook does or how it is used. If not available, README-... files can be used in place, especially in the case of adhoc playbooks that take input. Documentation for each playbook/role does not have to be on this wiki. Comments or README's should be sufficient.
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### Roles
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If you are using roles that are not part of this repository in the `roles` directory, you will need to list them in the `requirements.yml`. For example, we use the IPA role.
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```
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---
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- src: freeipa.ansible_freeipa
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```
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Otherwise, custom roles for the infrastructure will sit in `ansible/roles`.
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