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Re: [libvirt] [PATCH] Leave all child processes running when stopping systemd service



On Thu, 2012-03-22 at 14:22 +0000, Daniel P. Berrange wrote:
> On Thu, Mar 22, 2012 at 02:10:30PM +0000, Mark McLoughlin wrote:
> > On Thu, 2012-03-22 at 14:03 +0000, Daniel P. Berrange wrote:
> > > From: "Daniel P. Berrange" <berrange redhat com>
> > > 
> > > Currently the libvirt.service unit file for systemd does not
> > > specify any kill mode. So systemd kills off every process
> > > inside its cgroup. ie all dnsmasq processes, all virtual
> > > machines. This obviously not what we want. Set KillMode=process
> > > so that it only kills the top level process of libvirtd
> > > 
> > > * daemon/libvirtd.service.in: Add KillMode=process
> > 
> > I was still looking through this. Try doing:
> > 
> >   $> systemctl restart libvirtd.service
> > 
> > It's killing the existing processes in the cgroup when starting the
> > service. From poking at an strace, this looks like the code that's doing
> > it:
> > 
> >   http://cgit.freedesktop.org/systemd/systemd/tree/src/service.c?id=75c8e3cf#n2093
> 
> It didn't kill guests/dnsmasq in my testing.  Are you sure you did
> a 'systemctl daemon-reload' after adding the KillMode flag to the
> unit file ?

Yep:

[markmc zig ~]$ sudo systemctl show libvirtd.service | grep KillMode
KillMode=process
[markmc zig ~]$ systemd-cgls /system/libvirtd.service
/system/libvirtd.service:
├ 12660 /usr/sbin/libvirtd
├ 20598 /usr/bin/qemu-kvm -S -M pc-0.15 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name instance-00000021 -uuid 39e9ec0e-2...
└ 20665 /sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface ...
[markmc zig ~]$ sudo systemctl restart libvirtd.service
[markmc zig ~]$ systemd-cgls /system/libvirtd.service
/system/libvirtd.service:
└ 20742 /usr/sbin/libvirtd

Cheers,
Mark.


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