RE: [Xen-API] Some questions about XenAPI

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

 

The snapshot of XCP on xen.org includes a fairly recent xapi development build, which contains the VM.revert call. Binary .isos and sources are here:

 

http://www.xen.org/products/cloud_source.html

 

[ NB The development version of xapi will only work on XCP. At some point in future a stable version will become part of the next XenServer. ]

 

Cheers,

Dave

 

From: Lonangel [mailto:lonangel@xxxxxxxxx]
Sent: 22 November 2009 20:43
To: Dave Scott
Cc: xen-api@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-API] Some questions about XenAPI

 

Thanks for answering  so quickly.

Dave Scott wrote:

Hi,

Does anyone know if its possible to execute a command on a guest

through

the xenapi?

For example:

I want to test a group of programs written in java or c, the VM already

knows how to test this programs.

My main problem here is that i want to send data into the VM machine,

like the program file and start the command that evaluates those

programs, also get the output from the program.

You cannot do this through the XenAPI currently. I recommend doing something like this:

1. run a service inside your VM which accepts network connections; 

2. discover the VM's IP address via the XenAPI (VM_guest_metrics.networks map); 

3. connect to the service directly; and

4. transmit the command and receive the results via TCP/IP.

Would this work for you?

I think that if it's the only way, for now it has to work. :)

The second problem is, I need to revert the VM back to its initial

state

( clean all the damage the program might have done ) so it can be able

to test another program in the same conditions it tested the previous

program. The question is, can I revert a VM to a previous snapshot

using

the Xen API?

Yes: use the call

  VM.revert(session ref, VM ref)

where 'VM ref' is an existing snapshot (disk snapshot) or checkpoint (disk + memory snapshot)

Note that reverting to a checkpoint (disk + memory snapshot) will result in the VM being suspended. To make it run again you must call 'VM.resume'.

NB VM.revert is in the development version of xapi.

Hope that helps,

Dave

How exactly can i get the development version of the Xapi and does it work with Xenserver or only with XCP?

Thank you

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