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jbonofre pushed a commit to branch karaf-4.2.x
in repository https://gitbox.apache.org/repos/asf/karaf.git
The following commit(s) were added to refs/heads/karaf-4.2.x by this push:
new 1996867 Update configuration user guide about system properties
1996867 is described below
commit 1996867916d0426ced6fbb83a74e982c7071de34
Author: jbonofre <jbono...@apache.org>
AuthorDate: Wed Sep 30 09:19:40 2020 +0200
Update configuration user guide about system properties
---
manual/src/main/asciidoc/user-guide/configuration.adoc | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/manual/src/main/asciidoc/user-guide/configuration.adoc
b/manual/src/main/asciidoc/user-guide/configuration.adoc
index b63f235..b35fe47 100644
--- a/manual/src/main/asciidoc/user-guide/configuration.adoc
+++ b/manual/src/main/asciidoc/user-guide/configuration.adoc
@@ -44,6 +44,14 @@ property3=${existing_property:-bar} # "baz"
property4=${existing_property:+bar} # "bar"
----
+Apache Karaf will look for system property as well. For instance, the
following:
+
+----
+key=${foo}
+----
+
+means that `key` will contain `bar` if you start Karaf with `-Dfoo=bar`.
+
Environment variables can be referenced inside configuration files using the
syntax `${env:<name>}` (e.g.
`property=${env:FOO}` will set "property" to the value of the enviroment
variable "FOO"). Default and alternate
values can be defined for them as well using the same syntax as above.
