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----
-title: "Ansible custom facts"
-linkTitle: "Ansible custom facts"
-date: 2018-09-25
-description: >
-  How to write custom facte with ansible
----
-
-Custom facts are actually quite easy to implement despite the lack of documentation about it.
-
-## How they work
-
-On any Ansible controlled host — that is, the remote machine that is being controlled and not the machine on which the playbook is run — you just need to create a directory at
-`/etc/ansible/facts.d`. Inside this directory, you can place one or more `*.fact` files. These are files that return JSON data, which will then be included in the raft of facts that
-Ansible gathers.
-
-The facts will be available to ansible at `hostvars.host.ansible_local.<fact_name>`.
-
-## A simple example
-
-Here is the simplest example of a fact, let's suppose we make it `/etc/ansible/facts.d/mysql.fact` :
-{{< highlight sh >}}
-#!/bin/sh
-set -eu
-
-echo '{"password": "xxxxxx"}'
-{{< /highlight >}}
-
-This will give you the fact `hostvars.host.ansible_local.mysql.password` for this machine.
-
-## A more complex example
-
-A more interesting example is something I use with small webapps. In the container that hosts the frontent I use a small ansible role to generate a mysql password on its first run, and
-provision a database with a user that has access to it on a mysql server. This fact ensures that on subsequent runs we will stay idempotents. Here is how it works.
-
-First the fact from before, only slightly modified :
-{{< highlight sh >}}
-#!/bin/sh
-set -eu
-
-echo '{"password": "{{mysql_password}}"}'
-{{< /highlight >}}
-
-This fact is deployed with the following tasks :
-{{< highlight yaml >}}
-- name: Generate a password for mysql database connections if there is none
-  set_fact: mysql_password="{{ lookup('password', '/dev/null length=15 chars=ascii_letters') }}"
-  when: (ansible_local.mysql_client|default({})).password is undefined
-
-- name: Deploy mysql client ansible fact to handle the password
-  template:
-    src: ../templates/mysql_client.fact
-    dest: /etc/ansible/facts.d/
-    owner: root
-    mode: 0500
-  when: (ansible_local.mysql_client|default({})).password is undefined
-
-- name: reload ansible_local
-  setup: filter=ansible_local
-  when: (ansible_local.mysql_client|default({})).password is undefined
-
-- name: Ensures mysql database exists
-  mysql_db:
-    name: '{{ansible_hostname}}'
-    state: present
-  delegate_to: "{{mysql_server}}"
-
-- name: Ensures mysql user exists
-  mysql_user:
-    name: '{{ansible_hostname}}'
-    host: '{{ansible_hostname}}'
-    priv: '{{ansible_hostname}}.*:ALL'
-    password: '{{ansible_local.mysql_client.password}}'
-    state: present
-  delegate_to: '{{mysql_server}}'
-{{< /highlight >}}
-
-## Caveat : a fact you deploy is not immediately available
-
-Note that installing a fact does not make it exist before the next inventory run on the host. This can be problematic especially if you rely on facts caching to speed up ansible. Here
-is how to make ansible reload facts using the setup tasks (If you paid attention you already saw me use it above).
-{{< highlight yaml >}}
-- name: reload ansible_local
-  setup: filter=ansible_local
-{{< /highlight >}}
-
-## References
-
-- https://medium.com/@jezhalford/ansible-custom-facts-1e1d1bf65db8