[jira] [Commented] (KARAF-2466) make it easy to access environment variables inside karaf configuration properties files - via ${ENV.foo}?

["Michael Prieß (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KARAF-2466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15721707#comment-15721707 ] 

Michael Prieß commented on KARAF-2466:
--------------------------------------

I miss the part of using system properties and enviroment variables in the documentation.

> make it easy to access environment variables inside karaf configuration properties files - via ${ENV.foo}?
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: KARAF-2466
>                 URL: https://issues.apache.org/jira/browse/KARAF-2466
>             Project: Karaf
>          Issue Type: Improvement
>          Components: karaf-core
>            Reporter: james strachan
>            Assignee: Jean-Baptiste Onofré
>
> when using karaf in clouds & PaaS infrastructures like OpenShift, Docker, OpenStack et al; its common to use environment variables to pass in environment specific values; then keep a single disk image. It would be nice if there was an easy way to reference environment variables similar to the ${foo.bar} syntax for accessing system properties.
> Maybe karaf should support some kind of environment variable expansion like 
> {code}
> # define a property based on an env var
> foo = ${ENV.nameOfEnvVar} 
> # e.g. here's the host name
> host = ${ENV.HOSTNAME} 
> {code}



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