First big articles reformatting now that I properly understand hugo
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---
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title: "Ansible custom facts"
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linkTitle: "Ansible custom facts"
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date: 2018-09-25
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description: >
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How to write custom facte with ansible
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description: How to write custom facts with ansible
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tags:
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- ansible
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---
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## Introduction
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Custom facts are actually quite easy to implement despite the lack of documentation about it.
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## How they work
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## How custom facts work
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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
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`/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
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`/etc/ansible/facts.d`. Inside this directory, you can place one or more `*.fact` files. These are files that must return JSON data, which will then be included in the raft of facts that
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Ansible gathers.
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The facts will be available to ansible at `hostvars.host.ansible_local.<fact_name>`.
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@ -31,7 +33,7 @@ This will give you the fact `hostvars.host.ansible_local.mysql.password` for thi
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## A more complex example
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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
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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.
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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 idempotent.
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First the fact from before, only slightly modified :
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{{< highlight sh >}}
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