Re: [libvirt] [PATCH v3 00/48] Split the libvirtd daemon into per-driver daemons

On 30 Jul 2019, at 11:38, Daniel P. Berrangé <berrange(a)redhat.com&gt; wrote: On Tue, Jul 30, 2019 at 11:05:25AM +0200, Christophe de Dinechin wrote: > > Daniel P. Berrangé writes: > >> This is what all the driver refactoring I've done has been about >> enabling. >> >> We gain new daemons for each driver, for the primary virt drivers: >> >> virtlibxld > > virtxend? > >> virtlxcd >> virtqemud >> virtvboxd >> virtvzd >> >> And again for the secondary drivers >> >> virtinterfaced >> virtnetworkd >> virtnodedevd >> virtnwfilterd >> virtsecretd >> virtstoraged >> >> Finally to support IP connectivity, and also the legacy lbivirtd UNIX >> domain socket (for the old libvirt remote driver SSH tunnelling): >> >> virtproxyd >> >> The the sake of facilitating upgrades, the existing libvirtd still >> exists and works the same way it always has. >> >> You either run libvirtd, or you run the per-driver daemons, never both. > > What happens if you run both? > (I'll try to figure out by reviewing the rest of the code and/or testing) The drivers acquire an exclusive lock, causing the 2nd daemon to fail to startup $ ./src/libvirtd & $ ./src/virtqemud 2019-07-30 09:36:34.339+0000: 22809: info : libvirt version: 5.6.0 2019-07-30 09:36:34.339+0000: 22809: info : hostname: dhcp-16-132.lcy.redhat.com 2019-07-30 09:36:34.339+0000: 22809: error : virPidFileAcquirePath:376 : Failed to acquire pid file '/run/user/501/libvirt/qemu/run/driver.pid': Resource temporarily unavailable 2019-07-30 09:36:34.339+0000: 22809: error : virStateInitialize:688 : Initialisation of QEMU state driver failed: Failed to acquire pid file '/run/user/501/libvirt/qemu/run/driver.pid': Resource temporarily unavailable 2019-07-30 09:36:34.339+0000: 22809: error : daemonRunStateInit:821 : Driver state initialisation failed The same works the other way around too $ ./src/virtqemud & $ ./src/libvirtd 2019-07-30 09:37:45.398+0000: 23109: info : libvirt version: 5.6.0 2019-07-30 09:37:45.398+0000: 23109: info : hostname: dhcp-16-132.lcy.redhat.com 2019-07-30 09:37:45.398+0000: 23109: error : virPidFileAcquirePath:376 : Failed to acquire pid file '/run/user/501/libvirt/qemu/run/driver.pid': Resource temporarily unavailable 2019-07-30 09:37:45.398+0000: 23109: error : virStateInitialize:688 : Initialisation of QEMU state driver failed: Failed to acquire pid file '/run/user/501/libvirt/qemu/run/driver.pid': Resource temporarily unavailable 2019-07-30 09:37:45.398+0000: 23109: error : daemonRunStateInit:821 : Driver state initialisation failed the systemd unit files also have Conflicts rules which should prevent even getting that far

Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list