> On Fri, 2014-06-06 at 15:57 +0900, Yasunori Goto wrote:
> > Chen-san,
> >
> > > ping...
> >
> > I suppose it seems to be difficult for users to understand...
> > I think following order of description is desirable.
> >
> > - What is migrateuri?
> > - What is benefit?
> > - If it is ommited, what is happen?
> > The case of "migration_host" is specified.
> > The case of nothing specified
> >
> > How is the following example? I hope it is good hint for you.
> > (I'm newbie of man page of virsh, and may be I misunderstand
> > migrateuri/migration_host.
> > So please check and correct it.)
> >
> > ---
> > diff --git a/tools/virsh.pod b/tools/virsh.pod
> > index 02671b4..0ce0ca4 100644
> > --- a/tools/virsh.pod
> > +++ b/tools/virsh.pod
> > @@ -1236,9 +1236,8 @@ seen from the source machine.
> >
> > =back
> >
> > -When I<migrateuri> is not specified, libvirt will automatically determine
> > the
> > -hypervisor specific URI, by looking up the target host's configured
> > hostname.
> > -There are a few scenarios where specifying I<migrateuri> may help:
> > +I<migrateuri> is specifed for which IP/URL is used for transfer migration
> > data.
> > +Specifying I<migrateuri> may be helpful on some scenarios.
> >
> > =over 4
> >
> > @@ -1262,6 +1261,15 @@ order to comply with local firewall policies.
> >
> > =back
> >
> > +When I<migrateuri> is not specified, libvirt will ask destination side
> > whether
> > +"migration_host" is specified or not in qemu.conf at first. If
> > "migration_host"
> > +is specified in qemu.conf, libvirt will use its network for transfer
> > migration data.
> > +("migration_host" is useful when hosts has multiple network interface.)
> I think directly pointing out the specific file 'qemu.conf' is not
> good idea. because virsh man page is for all hypervisors including Xen,
> LXC, etc.
Ah, yes. I forgot it. Sorry.
> I think it should be said "For QEMU/KVM" to be better.
Ok.
Thanks,
>
>
> Thanks,
> Chen
>
> > +
> > +If "migration_host" is not specified too, then libvirt will automatically
> > +determine the hypervisor specific URI, by looking up the target host's
> > +configured hostname.
> > +
> > Optional I<graphicsuri> overrides connection parameters used for
> > automatically
> > reconnecting a graphical clients at the end of migration. If omitted,
> > libvirt
> > will compute the parameters based on target host IP address. In case the
> > --
> >
> > Thanks,
> >
> > >
> > > On Fri, 2014-05-30 at 14:54 +0800, Chen Fan wrote:
> > > > the 'migration_host' description maybe have a bit of difficulty to
> > > > understand for user, so add this manual for them.
> > > >
> > > > Signed-off-by: Chen Fan <chen.fan.f...@cn.fujitsu.com>
> > > > ---
> > > > tools/virsh.pod | 9 ++++++++-
> > > > 1 file changed, 8 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/tools/virsh.pod b/tools/virsh.pod
> > > > index de9a4f7..8d77a2f 100644
> > > > --- a/tools/virsh.pod
> > > > +++ b/tools/virsh.pod
> > > > @@ -1238,6 +1238,11 @@ seen from the source machine.
> > > >
> > > > When I<migrateuri> is not specified, libvirt will automatically
> > > > determine the
> > > > hypervisor specific URI, by looking up the target host's configured
> > > > hostname.
> > > > +In particular, some hypervisors support having this migration hostname
> > > > specified
> > > > +separately by setting 'migration_host' in definition file, if
> > > > 'migration_host'
> > > > +is specified, the hostname or IP address will be used to as the
> > > > default I<migrateuri>
> > > > +while running migration from source host. if 'migration_host' is not
> > > > specified,
> > > > +the migration hostname is set to the host's configured hostname by
> > > > default.
> > > > There are a few scenarios where specifying I<migrateuri> may help:
> > > >
> > > > =over 4
> > > > @@ -1251,7 +1256,9 @@ explicitly specified, using an IP address, or a
> > > > correct hostname.
> > > > interfaces, it might be desirable for the migration data stream to be
> > > > sent over
> > > > a specific interface for either security or performance reasons. In
> > > > this case
> > > > I<migrateuri> should be explicitly specified, using an IP address
> > > > associated
> > > > -with the network to be used.
> > > > +with the network to be used. In particular, Some hypervisors could be
> > > > easy to
> > > > +specify the default network interface by setting 'migration_host'.
> > > > then the
> > > > +I<migrateuri> can be omitted.
> > > >
> > > > =item * The firewall restricts what ports are available. When libvirt
> > > > generates
> > > > a migration URI, it will pick a port number using hypervisor specific
> > > > rules.
> > >
> >
>
--
Yasunori Goto <y-g...@jp.fujitsu.com>
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