Re: [libvirt-users] The Format Of URI when Migrating
On Fri, Sep 23, 2011 at 04:41:40PM +0800, huachao yao wrote:
Hi, when I try to use such API:
virDomainPtr
<http://www.libvirt.org/html/libvirt-libvirt.html#virDomainPtr> virDomainMigrate (virDomainPtr
<http://www.libvirt.org/html/libvirt-libvirt.html#virDomainPtr>
domain,
virConnectPtr
<http://www.libvirt.org/html/libvirt-libvirt.html#virConnectPtr>
dconn,
unsigned long flags,
const char * dname,
const char * uri,
unsigned long bandwidth)
to achieve the domain to the remote host. I set the "const char * uri"
as "qemu+ssh://root@116.56.142.199/system".
But the Error "libvir: QEMU error : invalid argument in only tcp URIs
are supported for KVM/QEMU migrations" happened.
I want to know when i want the migrate ,how can i set the URI ? offer
a example is better. :-)
The answer depends on the way you invoke migration. There are essentially
two ways libvirt supports
- "Normal" - the libvirt client co-ordinates the process, talking to
both the source and target libvirtd daemons.
- "Peer2Peer" - the libvirt client talks to the source libvirtd daemon.
The source libvirtd daemon co-ordinates the process directly with
the target libvirtd.
In the Normal case, the URI you need to give is a QEMU migration
URI such as 'tcp://hostname-of-target-host'.
In the Peer2Peer case (if you set VIR_MIGRATE_PEER2PEER in the flags
parameter), the URI you need is a normal libvirt URI such as the
'qemu+ssh://root@hostname-of-target-host/system'.
From the error message you are attempting a normal migration, so need
to give the tcp style URI i show above.
Daniel
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