On Fri, Mar 09, 2007 at 10:47:18AM +0000, Richard W.M. Jones wrote:
Daniel P. Berrange wrote:
Thinking about later RPM upgrades I think we need to think about whether it will be possible to restart the libvirt_qemud while guests & networks are running. There's a couple of issues:
- We do waitpid() to cleanup qemu & dnsmasq processes when we stop domains & networks, or to detect when they crash. For the former, we could may they daemons to avoid waitpid() cleanup, but we'd still need waitpid to be able to detect shutdowns. There is also the issue of enumerating running instances.
Maybe I'm missing something big here, but how would libvirt_qemud regain connections to the running qemu monitor ptys?
That's one of the challenges to be addressed :-) Fortunately the monitor is set to be exposed via /dev/pty/XXX, so if the restarted client can find out the path to the PTY, then it can re-open it. Maybe we just need to record a state file somewhere containing a PID & PTY path. Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|