Re: [Xen-users] alternative ways to trigger a domain migration

[Robert Welz <welz@xxxxxxxxxxxx>]

mr_ala wrote:
> Hello 
>
> I wonder whether there are other ways than "xm migrate <domainname> ..." to
> migrate a domain somewhere else. It would be great if the migration could be
> triggered by the domain itself, not from dom0.
You could issue an ssh "forced command" from DomU to Dom0 which will do 
that.
You create a public/private keypair in DomU and put the public key in 
/root/.ssh/authorized_keys in Dom0.
Then you modify /root/.ssh/authorized_keys and put a 
command=/path/to/the/command in the first bytes of the key, f.e:
command="/root/bin/check_for_updates_ssh" ssh-rsa AAAAB3Nz+VKpU...

of course you have to configure /etc/sshd_config in Dom0.

Now from DomU you call
sss -i /homedir_dont_need_to_be_root/.ssh/mykey root@xxxxxxxxxxx

and that command would be executed. The command could be a shell-script 
or whatever you like. Even 2 or more commands are allowed f.e.
command="/usr/bin/updatedb; /usr/sbin/makewhatis -u" ssh-rsa 
C1yomIG4567XAme9...
Robert

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