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https://issues.apache.org/jira/browse/KARAF-2466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293110#comment-14293110
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Jean-Baptiste Onofré commented on KARAF-2466:
---------------------------------------------
AFAIR, we did some improvements about that. I have to double check the syntax
and update the documentation. I will do that for 3.0.4.
> 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
> Reporter: james strachan
> Assignee: Jean-Baptiste Onofré
> Fix For: 4.0.0, 2.4.2, 3.0.4
>
>
> 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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