In the last Ansible post I’ve noted that there’s a difference when choosing between
include_vars. So, let’s explore the differences on a surface level.
- vars_files is a directive which can only be used on a playbook level.
- vars_files is a type of import, so it’s considered as static reuse, meaning
- It’s pre-processed during playbook parsing.
- Cannot be used in a loop.
- include_vars is an Ansible module.
- include_vars is a type of include, so it’s considered as dynamic reuse, meaning
- Processed at runtime.
- Mostly used when you want to include variables dynamically.
- It has a higher priority than vars_files, thus can override default variable values.
Which one to use then? It’s not kind of a straight forward answer. Mostly, it all comes down to static vs dynamic reuse.
Comparing includes and imports: dynamic and static re-use.
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