[Hawkular-dev] Property passing into Hawkular(-metrics)

[Matt Wringe]

On 16/06/15 04:29 AM, Heiko W.Rupp wrote:
> Hey,
>
> currently one can pass properties/options like the C* to use
> via -Dkey=value pairs to standalone.sh/bat
>
> This is a bit cumbersome and also does not work in cases, where
> the command line is set at "compile time" like in a Dockerfile,
> but the property needs to be set at run time (when docker run
> a pre-made image).

You can specify the default start options in the dockerfile, which 
allows for a simple install of that image.

But you can also pass your own options when you go to first start your 
docker image, as well as overwrite them in the kubernetes configuration.

Setting the options via a command line option is the easiest option when 
dealing with docker images and kubernetes, otherwise you need to jump 
through a bunch of hoops. I would really like to keep this option 
available if possible.

>
> There would be the option to set JAVA_OPTS before starting
> the script, but JAVA_OPTS is
> a) something that may apply to multiple java programs on a machine
> and is thus not specific
> b) inside standalone.conf not additive, so one has to repeat all the
> options from standalone.conf on JAVA_OPTS
>
> So I propose hat we add (similar to RHQ) some HAWKULAR_OPTS
> that are additive to JAVA_OPTS.
>
> We need to modify standalone.sh/bat to source them (and keep the
> modified versions in our git repo.
>
> Alternatives could be
> - create wrapper scripts that set JAVA_OPTS and call standalone.sh,
>    but that only indirectly solves [1]
> - as the WildFly team to add some WF_LOCAL_OPTS in upcoming releases.
>    I fear that may take too long.
>
> Opinions?
>
>
> [1] https://issues.jboss.org/browse/HAWKULAR-288
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