What if a remote environment variable doesn't exist? Ansible take this as an fatal error. How to avoid that?

[Zhenkai Jiang]

I want to do some check using remote environment variables, which can be read from format like this

{{ ansible_env.NGINX_HOME }}

This "path" or environment variable can be absent, and that's the purpose of that check anyway.

But Ansible treat this as a fatal error, showing error message like

One or more undefined variables: 'dict object' has no attribute 'NGINX_HOME'

What can I do to just skip this?

[Matt Martz]

You can use the |default jinja2 filter to help you out:

{{ ansible_env['NGINX_HOME']|default('') }}

This will default the value to '' if NGINX_HOME does not exist in the dict.

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Matt Martz
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[Zhenkai Jiang]

Thank you so much