[systemd-devel] QEMU and Socket Activation

[Jeremy]

I have libvirtd installed to handle QEMU instances (QEMU-KVM also)
  and find that any VMs I have need to be launch at system startup
  and can't be launch on demand (too slow to bootstrap a VM for a
network service)

On Thu, 2011-09-08 at 19:18 -0400, rektide wrote:
> Greetings systemd, I hope I'm in the right place--
> 
> Can anyone sketch out an outline for how, hypothetically, the following service 
> might be possible:
> 
> 1. Systemd understands that it needs to open a socket / socket activation kicks in.
> 2. When the socket is asked for, systemd launches a qemu instance and pipes data into
>    the running VM, which handles the request.
> 3. Further requests are fed into the same VM.
> 4. After an extended period of time with no activity, systemd asks the VM to shut down.
> 
> Partial credit answers are awarded points too!
> 
> 
> My naive idea;
> 
> 1. Systemd hosts a wrapper service, the wrapper service claims the port.
> 3. Inside the executable wrapper are two things, `systemd start my-qemu-guest`, `nc
>    my-qemu-guest 33333`.
>    Err, wait, there's got to be a long arsed `sleep` in between those two! :(
> 4. I have no idea how unloading is dealt with. It'd be nice to make qemu do it, but what I
>    would know how to script is making the guest shut itself down.
> 
> This seems workable and do-able, but not nearly as clean as I'd desire. Surely someone can
> come up with something nicer?  If this idea for implementation has holes, please illuminate
> me.
> 
> 
> The major cruft seems to be the idea of having a wrapper script manage the QEMU system,
> although I've already stated that wrapper is just poking another QEMU systemd service.  If 
> multiple services rely on the same VM, who can determine when the VM needs to be shut 
> down?
> 
> 
> 
> Keep kicking ass guys, systemd is the best process 1 ever.
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