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How to use/access docker environment variables in Shibboleth xml files?

I am trying to inject my docker environment variables into my shibboleth2.xml file. Shibboleth does not recognize my environment variables at all.

For example

 <ApplicationDefaults entityID="${MY_ENV_VARIABLE}">

I am wondering if there is a way to make Shibboleth access these values?

Thank you.

Solution

  • Envsubst can be used for replacing environment variables in a file.

    envsubst < input.file > output.file