[one-users] Why no hooks for migration?

[Carlos Martín Sánchez]

Hi Richard,

You can create a hook on RUNNING and then check the VM history to detect if
it has reached that state after a migration. Use $TEMPLATE as one of the
arguments to get the VM information. You have the life-cycle reference here
[1,2].

Below is a sample xml of a VM migrated from (1 localhost) to (0 vm). Note
that the HISTORY record with SEQ 0 has a REASON value of 3, that means that
the execution on that host ended because the user requested it.

Possible values for the REASON element are (see [3]):

    enum MigrationReason
    {
        NONE,       /** < Normal termination in host */
        ERROR,      /** < The VM was migrated because of an error */
        STOP_RESUME,/** < The VM was migrated because of a stop/resume
request*/
        USER,       /** < The VM was migrated because of an explicit
request */
        CANCEL      /** < The VM was migrated because of an explicit cancel
*/
    };


<VM>
...
  <HISTORY_RECORDS>
    <HISTORY>
      <SEQ>0</SEQ>
      <HOSTNAME>localhost</HOSTNAME>
      <VM_DIR>/var/lib/one/</VM_DIR>
      <HID>1</HID>
      <STIME>1324391103</STIME>
      <ETIME>1324392594</ETIME>
      <VMMMAD>vmm_dummy</VMMMAD>
      <TMMAD>tm_shared</TMMAD>
      <PSTIME>1324391103</PSTIME>
      <PETIME>1324391103</PETIME>
      <RSTIME>1324391103</RSTIME>
      <RETIME>1324392594</RETIME>
      <ESTIME>0</ESTIME>
      <EETIME>0</EETIME>
      <REASON>3</REASON>
    </HISTORY>
    <HISTORY>
      <SEQ>1</SEQ>
      <HOSTNAME>vm</HOSTNAME>
      <VM_DIR>/var/lib/one/</VM_DIR>
      <HID>0</HID>
      <STIME>1324392594</STIME>
      <ETIME>0</ETIME>
      <VMMMAD>vmm_dummy</VMMMAD>
      <TMMAD>tm_shared</TMMAD>
      <PSTIME>1324392594</PSTIME>
      <PETIME>1324392594</PETIME>
      <RSTIME>1324392594</RSTIME>
      <RETIME>0</RETIME>
      <ESTIME>0</ESTIME>
      <EETIME>0</EETIME>
      <REASON>0</REASON>
    </HISTORY>
  </HISTORY_RECORDS>
</VM>

Regards.

[1]
http://opennebula.org/documentation:rel3.0:vm_guide_2#virtual_machine_life-cycle
[2] http://opennebula.org/_media/documentation:rel3.0:states-complete.png
[3]
http://dev.opennebula.org/projects/opennebula/repository/revisions/one-3.0/entry/include/History.h
--
Carlos Martín, MSc
Project Engineer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org | cmartin at opennebula.org |
@OpenNebula<http://twitter.com/opennebula><cmartin at opennebula.org>


On Sat, Dec 17, 2011 at 11:15 PM, richard -rw- weinberger <
richard.weinberger at gmail.com> wrote:

> Ruben,
>
> On Sat, Dec 17, 2011 at 10:52 PM, Ruben S. Montero <rubensm at dacya.ucm.es>
> wrote:
> > Hi Richard,
> >
> > This is now ready in 3.2 beta1. The networking hooks have been moved to a
> > driver form with better integration with the VM life-cycle. Among other
> > things this fixes the issues with live migrations stop/resumes etc...
>
> Good to know. But I guess 3.2 is not yet production ready.
>
> Is there a way to install iptables rules for a guest upon migration on 3.0?
> I don't fear writing my own scripts...
>
> --
> Thanks,
> //richard
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>
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