Re: Distributed CC with QEMU?

[Dan Rollo-2]

Hi Lothar,

Interesting idea. FWIW, I use a number of VirtualBox VMs with cc-agents
to perform builds, but I leave the VM/Agents running.

I think it should be possible to do what you suggest.
Have a look at the JMXBuildAgentUtility. This provides a way to
programmatically stop a BuildAgent. You'd want to make sure the Agent
stays alive long enough after a build to ensure all build results have
been returned (so make sure KillOrRestartAfterBuildFinished=true).

If the QEMU(or VBox ;) vm automatically starts a build agent when the
OS/User luanches, then I think it would all work.

You can probably use a CompoundBuilder to invoke the
JMXBuildAgentUtility to kill the agent - and not even have to customize
Builders at all.

If you get stuck, holler!

Dan

PS: I know cost is always an issue, but the time it takes a VM to load
may or may not be faster than leaving the VM running...but that tends to
want more RAM...


Subject: [Cruisecontrol-user] Distributed CC with QEMU?
To: cruisecontrol-user@...

Hi,

I like to use CC to build my project on multiple platforms, but I
haven't enough resources to run each platform at the same time.

I thought it could be possible to configure auto shutdown servers
running in a QEMU instance and talking to CC master.
So when the first server of this kind is started it waits for any
change in code and starts a build when a change occurs. Then
the server shuts it self down to let a script on the QEMU host rotate
to the next QEMU instance to run.

So my question is as follows: Could a build agent do such a one shot
build?

If the agent stops the parent script could halt the machine.

Thanks

Lothar

-- | Rapid Prototyping | XSLT Codegeneration | http://www.lollisoft.de
Lothar Behrens
Heinrich-Scheufelen-Platz 2
73252 Lenningen

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[Lothar Behrens]

Am 12.08.2009 um 20:48 schrieb Dan Rollo:

> Hi Lothar,
>
> Interesting idea. FWIW, I use a number of VirtualBox VMs with cc-
> agents
> to perform builds, but I leave the VM/Agents running.
>

I do not have endless memory and keeping scheduled build running at  
distinct time
is a bit more work than simply running some qemu instances serialized  
in a script. Another solution
would be freezing unused qemu instances and keep only one continuing.  
Using a ring list of
qemu PID's to shedule probably keeps the qemu guest install simpler :-)

> I think it should be possible to do what you suggest.
> Have a look at the JMXBuildAgentUtility. This provides a way to
> programmatically stop a BuildAgent. You'd want to make sure the Agent
> stays alive long enough after a build to ensure all build results have
> been returned (so make sure KillOrRestartAfterBuildFinished=true).
>

I haven't setup that scenario yet. I need to read some about the  
JMXBuildAgentUtility :-)

> If the QEMU(or VBox ;) vm automatically starts a build agent when the
> OS/User luanches, then I think it would all work.
>

Using init scripts would help. On a Windows host there are similar  
solutions to start...

> You can probably use a CompoundBuilder to invoke the
> JMXBuildAgentUtility to kill the agent - and not even have to  
> customize
> Builders at all.
>

Maybe working on a sample setup and publish?

> If you get stuck, holler!
>
> Dan
>
> PS: I know cost is always an issue, but the time it takes a VM to load
> may or may not be faster than leaving the VM running...but that  
> tends to
> want more RAM...

Ringlist structure, but then swap may grow. I only have 3GB and use  
other VM's for CVS and Mailserver :-)
I have setup this VM's to keep resetup a bit easier, if I need to move  
between hosts.

Lothar

-- | Rapid Prototyping | XSLT Codegeneration | http://www.lollisoft.de
Lothar Behrens
Heinrich-Scheufelen-Platz 2
73252 Lenningen









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