When restarting libvirt services and sockets *and* libvirt-guests.service is running, the latter will sometimes hang when trying to connect to libvirtd. Even though libvirt-guests has 'Wants=libvirtd.service' and 'After=libvirtd.service', we can see via journalctl that it is not shutdown before libvirtd when executing something like systemctl try-restart libvirtd.service libvirtd.socket \ libvirtd-ro.socket virtlockd.service virtlockd.socket \ virtlogd.service virtlogd.socket virt-guest-shutdown.target Oct 28 15:53:31 systemd[1]: Stopping Virtualization daemon... Oct 28 15:53:31 systemd[1]: libvirtd.service: Succeeded. Oct 28 15:53:31 systemd[1]: Stopped Virtualization daemon. Oct 28 15:53:31 systemd[1]: libvirtd-admin.socket: Succeeded. Oct 28 15:53:31 systemd[1]: Closed Libvirt admin socket. Oct 28 15:53:31 systemd[1]: Stopping Libvirt admin socket. Oct 28 15:53:31 systemd[1]: libvirtd-ro.socket: Succeeded. Oct 28 15:53:31 systemd[1]: Closed Libvirt local read-only socket. Oct 28 15:53:31 systemd[1]: Stopping Libvirt local read-only socket. Oct 28 15:53:31 systemd[1]: libvirtd.socket: Succeeded. Oct 28 15:53:31 systemd[1]: Closed Libvirt local socket. Oct 28 15:53:31 systemd[1]: Stopping Libvirt local socket. Oct 28 15:53:31 systemd[1]: Listening on Libvirt local socket. Oct 28 15:53:31 systemd[1]: Listening on Libvirt admin socket. Oct 28 15:53:31 systemd[1]: Listening on Libvirt local read-only socket. Oct 28 15:53:31 systemd[1]: virtlockd.socket: Succeeded. Oct 28 15:53:31 systemd[1]: Closed Virtual machine lock manager socket. Oct 28 15:53:31 systemd[1]: Stopping Virtual machine lock manager socket. Oct 28 15:53:31 systemd[1]: Listening on Virtual machine lock manager socket. Oct 28 15:53:31 systemd[1]: virtlogd.socket: Succeeded. Oct 28 15:53:31 systemd[1]: Closed Virtual machine log manager socket. Oct 28 15:53:31 systemd[1]: Stopping Virtual machine log manager socket. Oct 28 15:53:31 systemd[1]: Listening on Virtual machine log manager socket. Oct 28 15:53:31 systemd[1]: Stopping Suspend/Resume Running libvirt Guests... In this case, the try-restart command hung and libvirt-guests was stuck trying to connect to libvirtd. In the following case, the try-restart worked since libvirtd was started again before libvirt-guests was stopped! Oct 28 15:19:02 systemd[1]: Stopping Virtualization daemon... Oct 28 15:19:02 systemd[1]: Stopped Virtualization daemon. Oct 28 15:19:02 systemd[1]: Closed Libvirt admin socket. Oct 28 15:19:02 systemd[1]: Stopping Libvirt admin socket. Oct 28 15:19:02 systemd[1]: Closed Virtual machine lock manager socket. Oct 28 15:19:02 systemd[1]: Stopping Virtual machine lock manager socket. Oct 28 15:19:02 systemd[1]: Listening on Virtual machine lock manager socket. Oct 28 15:19:02 systemd[1]: Closed Libvirt local read-only socket. Oct 28 15:19:02 systemd[1]: Stopping Libvirt local read-only socket. Oct 28 15:19:02 systemd[1]: Closed Libvirt local socket. Oct 28 15:19:02 systemd[1]: Stopping Libvirt local socket. Oct 28 15:19:02 systemd[1]: Listening on Libvirt local socket. Oct 28 15:19:02 systemd[1]: Listening on Libvirt admin socket. Oct 28 15:19:02 systemd[1]: Listening on Libvirt local read-only socket. Oct 28 15:19:02 systemd[1]: Closed Virtual machine log manager socket. Oct 28 15:19:02 systemd[1]: Stopping Virtual machine log manager socket. Oct 28 15:19:02 systemd[1]: Listening on Virtual machine log manager socket. Oct 28 15:19:02 systemd[1]: Starting Virtualization daemon... Oct 28 15:19:02 systemd[1]: Stopping Suspend/Resume Running libvirt Guests... Oct 28 15:19:02 systemd[1]: Started Virtualization daemon. Oct 28 15:19:02 libvirt-guests.sh[4912]: Running guests on default URI: no running guests. Oct 28 15:19:02 systemd[1]: Stopped Suspend/Resume Running libvirt Guests. Oct 28 15:19:02 systemd[1]: Stopped target Libvirt guests shutdown. Oct 28 15:19:02 systemd[1]: Stopping Libvirt guests shutdown. Oct 28 15:19:02 systemd[1]: Reached target Libvirt guests shutdown. Oct 28 15:19:02 systemd[1]: Starting Suspend/Resume Running libvirt Guests... Oct 28 15:19:02 systemd[1]: Started Suspend/Resume Running libvirt Guests. Adding 'Requires=libvirtd.service' to virt-guest-shutdown.target results in expected behavior Oct 28 15:40:00 systemd[1]: Stopping Suspend/Resume Running libvirt Guests... Oct 28 15:40:00 libvirt-guests.sh[5245]: Running guests on default URI: no running guests. Oct 28 15:40:00 systemd[1]: Stopped Suspend/Resume Running libvirt Guests. Oct 28 15:40:00 systemd[1]: Stopped target Libvirt guests shutdown. Oct 28 15:40:00 systemd[1]: Stopping Libvirt guests shutdown. Oct 28 15:40:00 systemd[1]: Stopping Virtualization daemon... Oct 28 15:40:00 systemd[1]: Stopped Virtualization daemon. Oct 28 15:40:00 systemd[1]: Closed Virtual machine log manager socket. Oct 28 15:40:00 systemd[1]: Stopping Virtual machine log manager socket. Oct 28 15:40:00 systemd[1]: Listening on Virtual machine log manager socket. Oct 28 15:40:00 systemd[1]: Closed Libvirt admin socket. Oct 28 15:40:00 systemd[1]: Stopping Libvirt admin socket. Oct 28 15:40:00 systemd[1]: Closed Libvirt local read-only socket. Oct 28 15:40:00 systemd[1]: Stopping Libvirt local read-only socket. Oct 28 15:40:00 systemd[1]: Closed Libvirt local socket. Oct 28 15:40:00 systemd[1]: Stopping Libvirt local socket. Oct 28 15:40:00 systemd[1]: Listening on Libvirt local socket. Oct 28 15:40:00 systemd[1]: Listening on Libvirt admin socket. Oct 28 15:40:00 systemd[1]: Listening on Libvirt local read-only socket. Oct 28 15:40:00 systemd[1]: Closed Virtual machine lock manager socket. Oct 28 15:40:00 systemd[1]: Stopping Virtual machine lock manager socket. Oct 28 15:40:00 systemd[1]: Listening on Virtual machine lock manager socket. Oct 28 15:40:00 systemd[1]: Starting Virtualization daemon... Oct 28 15:40:00 systemd[1]: Started Virtualization daemon. Oct 28 15:40:00 systemd[1]: Reached target Libvirt guests shutdown. Oct 28 15:40:00 systemd[1]: Starting Suspend/Resume Running libvirt Guests... Oct 28 15:40:00 systemd[1]: Started Suspend/Resume Running libvirt Guests. Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx> --- I asked about this on the dev list but it is probably best to send a patch for discussion instead. https://www.redhat.com/archives/libvir-list/2020-October/msg01492.html src/remote/virt-guest-shutdown.target | 1 + 1 file changed, 1 insertion(+) diff --git a/src/remote/virt-guest-shutdown.target b/src/remote/virt-guest-shutdown.target index 25d4aaa267..e2efa3e63a 100644 --- a/src/remote/virt-guest-shutdown.target +++ b/src/remote/virt-guest-shutdown.target @@ -1,3 +1,4 @@ [Unit] Description=Libvirt guests shutdown +Requires=libvirtd.service Documentation=https://libvirt.org -- 2.28.0
