Ansible inventory vars. Part 2: Ansible and variables 2018-09-24

Ansible inventory vars Rating: 7,2/10 1495 reviews

Ansible

ansible inventory vars

Michael DeHaan did not like it, and he was right. This post will probably help you if you are new to Ansible, trying to figure out what to put and where. The inventory In the inventory file I created a new group. Sorry it has taken me so long to get back. The opinions expressed in this blog are my own and not those of my employer.

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Ansible

ansible inventory vars

Files that are relative to the main inventory file. There are many of these inbuilt variables on offer to the user when constructing the file. Instead of taking twenty to thirty minutes to build a new server when using an Ansible playbook with a few manual steps , the process can be completed in just a few minutes, with no manual intervention. Anything in the vars directory of the role overrides previous versions of that variable in namespace. Read Ansible for DevOps, available on LeanPub:. These variables are normally defined per host or group in inventory, but they behave like other variables.

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Ansible Inventory

ansible inventory vars

Why might this be useful? The following is an excerpt from Chapter 7 of , a book on Ansible by Jeff Geerling. Variables Some variables alter the behavior of ansible see for a list. There has been no 'official' way to use dynamic 'play vars, as the vars dictionary is not a supported way to access them and it is something we might remove. The smallest piece of steps to execute is written in block. Effectively registered variables are just like facts. Executing the playbook on non-development inventories will force you tu use the -i, which is a good safety measure. Other useful magic variables refer to the current play or playbook, including: New in version 2.

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How do I read Ansible variables from inventory files?

ansible inventory vars

Variable in playbooks are very similar to using variables in any programming language. Like in the case checking {{Output. Variable precedence is detailed in a later chapter. For instance, you could have hosts www1 and www2, assembled in group webservers, and later reference the group or individual hosts, depending on your needs. The contains many examples of how variables are used in Ansible.

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Playbook vars are not present in hostvars[inventory_hostname] dict · Issue #31679 · ansible/ansible · GitHub

ansible inventory vars

Sign up for a free GitHub account to open an issue and contact its maintainers and the community. All in all, it is just a mechanism to take those values out of tasks files readability and role life cycle. This has advantages in scaling Ansible in push mode with very large numbers of systems, mainly, or if you are using Ansible on experimental platforms. ExampleInventory Save the above as inventory. You should be using roles for sure.

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Using Variables — Ansible Documentation

ansible inventory vars

Variable names should be letters, numbers, and underscores. With dynamic inventory script hosts. Inside those directories, you can put a single with the same name as a host or group respectively and Ansible will use those definitions. Thanks for contributing an answer to Server Fault! There are a few other things that go on with roles. Currently, Ansible ships with two persistent cache plugins: redis and jsonfile. All directories are optional besides tasks.

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Creating custom dynamic inventories for Ansible

ansible inventory vars

The role The role sslcerts has one task file and one handler restart haproxy. The shebang line at the top of the file! Do not rely on types set during definition, always make sure you specify type with a filter when needed when consuming the variable. It helps you to use and assign a value to a variable and use that anywhere in the playbook. How could we handle sensitive variables - like a database password? This variable defaults to 1 if not set. I guess that after going down this trial and error path, I finally came up with something I will stick to. So you need to try something extra like jq after trimming the output to make it valid json. So my issue is as follows: I want to use vault for storing ssh key pairs.

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Ansible Variables

ansible inventory vars

If you are not sharing your role with others, app specific behaviors like ports is fine to put in here. To avoid this, Ansible 1. Editing two yaml files one for the appservers and one for the loadbalancers was not an option in this situation. But the parameterized roles and parameterized includes are more akin to parameter passing and so the state is not shared. If your deployment requires specific variables in addition to the already defined vars, one can specify others based on host groups. I was summoned here kinda from the left field, but oh well.

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