Re: [Xen-devel] RFC: making the xen startup integrate better with distros

[Nate Carlson <natecars@xxxxxxxxxxxxxxx>]

On Fri, 1 Jun 2007, Daniel P. Berrange wrote:
> What follows below is an outline of what we're changing in Xen startup 
> for Fedora 8. I know historically when getting into initscripts you tend 
> to hit distro specific issues. So I'm posting this to see if there's any 
> interest from others in having these changes integrated upstream. I'd 
> like to thing that with a few minor tweaks this is general enough to be 
> useful to other Linux distros at least - the init script is basically 
> making use of LSB defined functions...
Sounds like an excellent idea. Debian and Ubuntu don't ship with a 
'functions' file, but I think this could easily be made to work on both.
> * The individual daemons should each be started from the init scripts
>   directly. User can see exactly what's started & what's running. We
>   can then easily pass custom command line args to each one.
Agreed. The other advantage of this is that it would be easy to launch 
said programs from a daemon monitoring app (ie, daemontools, etc).
> * Drop a file in /etc/sysconfig/xen allowing user to customize the
>   startup options for individual daemons.
Like you said, also /etc/default/xen on Debian. Debian does already have 
an /etc/default/xendomains which control the way that domains are 
started/stopped.
> We can also trigger a reload by directly sending each reloadable daemon 
> a SIGHUP. This makes xend re-read its config file, and make xenconsoled 
> re-open its logfiles
Beautiful!

> The attached patch shows the changes to the init script to do this, as 
> well as killing off most of tools/misc/xend (what becomes 
> /usr/sbin/xend). It could probably go a bit further a kill off alot of 
> stuff in the python class tools/python/xen/xend/server/SrvDaemon.py 
> since much of that isn't needed now that its leveraging standard LSB 
> init functions to do most of the PID file handling for shutdown, reload, 
> status commands.
The Debian packaging for Xen also includes a pile of patches to allow 
python paths and such to be more configurable - this is because Debian 
allows you to have multiple versions of the tools and hypervisor 
installed. It'd be really nice to see these integrated upstream; they are 
the primary thing that takes awhile to patch up with each new Xen release 
to get Debian packages built. If you're interested in seeing what they 
are, I can post them, or convince one of the regular Deb developers to 
upload them.  :)
------------------------------------------------------------------------
| nate carlson | natecars@xxxxxxxxxxxxxxx | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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