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Diffstat (limited to 'content/blog/ansible/custom-fact.md')
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diff --git a/content/blog/ansible/custom-fact.md b/content/blog/ansible/custom-fact.md index 21e3300..10ab6bc 100644 --- a/content/blog/ansible/custom-fact.md +++ b/content/blog/ansible/custom-fact.md @@ -1,17 +1,19 @@ --- title: "Ansible custom facts" -linkTitle: "Ansible custom facts" date: 2018-09-25 -description: > - How to write custom facte with ansible +description: How to write custom facts with ansible +tags: + - ansible --- +## Introduction + Custom facts are actually quite easy to implement despite the lack of documentation about it. -## How they work +## How custom facts 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 +`/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 Ansible gathers. The facts will be available to ansible at `hostvars.host.ansible_local.<fact_name>`. @@ -31,7 +33,7 @@ This will give you the fact `hostvars.host.ansible_local.mysql.password` for thi ## 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. +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. First the fact from before, only slightly modified : {{< highlight sh >}} |