Re: Daemontools question.

["Karl E. Jorgensen" <karl@fizzback.net>]

On Wed, 2010-10-06 at 12:29 +0200, Friedrich Clausen wrote: 
> Hi All,
>
> I am trying to run some Java programs under daemontools and it is
> working quite well. Except they are running as root and I would like
> to make them run as www-data. I found the daemontools "setuidgid"
> program which works for well for starting up the application but then
> daemontools cannot shut the application down again. Here is an example
> of the daemontools run job -
>
> #!/bin/bash
> # /etc/service/myapplication/run startup script
> source /etc/default/myapplication
> exec setuidgid www-data java  -jar /opt/webapps/myapplication.jar
> --port 9000 --headless >> /opt/logs/myapplication.log 2>&1
You may want to look into jsvc - this has some similar capabilities. For example, have a look at the init script for tomcat - this should be a good template

> when I leave out the setuidgid stuff then I am able to start and stop
> the application. But with the above example the shutdown signal does
> not seem to reach the Java process even though I am using exec.

Java processes tend to be a bit nasty here: e.g. tomcat is intended to shut down when told (nicely) to shut down - by receipt of a message. But if it is wedged, then it will not reply and needs to be killed. Again, the init script for tomcat should be instructive here.

Hope this helps

--
Karl E. Jørgensen
Geek