User Story

As an EAP server user (developer or sys admin), I want to be able to override management attribute values with environment variables to resolve management model expressions.

Purpose

EAP on OpenShift in the cloud relies on container environment variables to customize its configuration to the container platform. It is difficult to change the value of a management attribute from the standalone configuration if the attribute does not provide a default value with an expression that can be resolved at runtime. For example, the user wants to update the `proxy-address-forwarding` attribute on the `/subsystem=undertow/server=default-server/http-listener=default` resource. It is not possible to achieve this with our existing configuration as the value is not specified in standalone.xml and defaults to `false`. If we want to allow our users to change this attribute, we must explicitely set its value with an expression that defaults to its default value.

+ I want to improve configuration flexibility, simplify cloud deployment

Expected Outcome

I can override management attributes with environment variables.

General Notes/Links

EPIC - EAPDOC-107

STORY - EAPDOC-187

EAP7-1733
Engineering analysis

WildFly core doc

SME: Jeff Mesnil

Tester: Vojtěch Šalbaba