Re: [Xen-devel] Suggestion for merging xl save/restore/migrate/migrate-receive

[Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>]

On 09/16/2013 12:40 PM, George Dunlap wrote:
> On 16/09/13 17:20, Ian Jackson wrote:
>> Zhigang Wang writes ("Re: [Xen-devel] Suggestion for merging xl 
>> save/restore/migrate/migrate-receive"):
>>> ---- xl-migrate.rst ----
>> ...
>>> * Current xl migrate command is not intuitive, especially the `-s` option::
>>>
>>>        # xl migrate
>>>        Usage: xl [-v] migrate [options] <Domain> <host>
>>>        
>>>        Save a domain state to restore later.
>>>        
>>>        Options:
>>>        
>>>        -h              Print this help.
>>>        -C <config>     Send <config> instead of config file from creation.
>>>        -s <sshcommand> Use <sshcommand> instead of ssh.  String will be 
>>> passed
>>>                        to sh. If empty, run <host> instead of ssh <host> xl
>>>                        migrate-receive [-d -e]
>>>        -e              Do not wait in the background (on <host>) for the 
>>> death
>>>                        of the domain.
>>>
>>>    It's a little hard to adapt other tools as transport.
>> Perhaps the documentation needs to be improved.  But you can just say
>>     xl migrate -s '' 42 'nc remotehost 1234'
> 
> Actually, that's a pretty bizarre interface -- I don't think I would 
> have gotten that from the help.
> 
> If we had a new "transport" option that could take format strings, we 
> could even set the default transport in xl.conf, like so:
> 
> migrate.default.transport="myssh %h %r"
> 
> migrate.default.transport="nc %h 1234"
> 
> migrate.default.transport="socat - OPENSSL:%h:8005,verify=0"
> 
> (Where %h would be the remote host, and %r the remote command to execute 
> -- i.e., xl recieve.)
> 
> Or of course:
> 
> xl migrate -t "nc %h 1234" 42 remotehost
> 
> Zhigang, would that work better for you guys?

Yes. I think it's a improvement to the -s option anyways.

I was thinking the same thing when I work on the example. With this, the
example doesn't need the customized command any more
(xl-migrate-command/xl-ssl-migrate-command).

(But haven't decided how to do the migration yet; the socat just a
example)

Thanks,

Zhigang

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