Hi David,
I encountered the UnsupportAnswer once before, when I made some changes in
the kvm plugin.
Normally there should be some network configurations in the agent.log but I
do not see it.
-Wei
2018-01-30 15:00 GMT+01:00 David Mabry <dma...@ena.com.invalid>:
> Hi Wei,
>
> I detached the iso and received the same error. Just out of curiosity,
> what leads you to believe it is something in the vxlan code? I guess at
> this point, attaching a remote debugger to the agent in question might be
> the best way to get to the bottom of what is going on.
>
> Thanks in advance for the help. I really, really appreciate it.
>
> Thanks,
> David Mabry
>
> On 1/30/18, 3:30 AM, "Wei ZHOU" <ustcweiz...@gmail.com> wrote:
>
> The answer should be caused by an exception in the cloudstack agent.
> I tried to migrate a vm in our testing env, it is working.
>
> there are some different between our env and yours.
> (1) vlan VS vxlan
> (2) no ISO VS attached ISO
> (3) both of us use ceph and centos7.
>
> I suspect it is caused by codes on vxlan.
> However, could you detach the ISO and try again ?
>
> -Wei
>
>
>
> 2018-01-29 19:48 GMT+01:00 David Mabry <dma...@ena.com.invalid>:
>
> > Good day Cloudstack Devs,
> >
> > I've run across a real head scratcher. I have two VMs, (initially 3
> VMs,
> > but more on that later) on a single host, that I cannot live migrate
> to any
> > other host in the same cluster. We discovered this after attempting
> to
> > roll out patches going from CentOS 7.2 to CentOS 7.4. Initially, we
> > thought it had something to do with the new version of libvirtd or
> qemu-kvm
> > on the other hosts in the cluster preventing these VMs from
> migrating, but
> > we are able to live migrate other VMs to and from this host without
> issue.
> > We can even create new VMs on this specific host and live migrate
> them
> > after creation with no issue. We've put the migration source agent,
> > migration destination agent and the management server in debug and
> don't
> > seem to get anything useful other than "Unsupported command".
> Luckily, we
> > did have one VM that was shutdown and restarted, this is the 3rd VM
> > mentioned above. Since that VM has been restarted, it has no issues
> live
> > migrating to any other host in the cluster.
> >
> > I'm at a loss as to what to try next and I'm hoping that someone out
> there
> > might have had a similar issue and could shed some light on what to
> do.
> > Obviously, I can contact the customer and have them shutdown their
> VMs, but
> > that will potentially just delay this problem to be solved another
> day.
> > Even if shutting down the VMs is ultimately the solution, I'd still
> like to
> > understand what happened to cause this issue in the first place with
> the
> > hopes of preventing it in the future.
> >
> > Here's some information about my setup:
> > Cloudstack 4.8 Advanced Networking
> > CentOS 7.2 and 7.4 Hosts
> > Ceph RBD Primary Storage
> > NFS Secondary Storage
> > Instance in Question for Debug: i-532-1392-NSVLTN
> >
> > I have attached relevant debug logs to this email if anyone wishes
> to take
> > a look. I think the most interesting error message that I have
> received is
> > the following:
> >
> > 468390:2018-01-27 08:59:35,172 DEBUG [c.c.a.t.Request]
> > (Work-Job-Executor-6:ctx-188ea30f job-181792/job-181802
> ctx-8e7f45ad)
> > (logid:f0888362) Seq 22-942378222027276319: Received: { Ans: ,
> MgmtId:
> > 14038012703634, via: 22(csh02c01z01.nsvltn.ena.net), Ver: v1,
> Flags: 110,
> > { UnsupportedAnswer } }
> > 468391:2018-01-27 08:59:35,172 WARN [c.c.a.m.AgentManagerImpl]
> > (Work-Job-Executor-6:ctx-188ea30f job-181792/job-181802
> ctx-8e7f45ad)
> > (logid:f0888362) Unsupported Command: Unsupported command issued:
> > com.cloud.agent.api.PrepareForMigrationCommand. Are you sure you
> got the
> > right type of server?
> > 468392:2018-01-27 08:59:35,179 ERROR [c.c.v.VmWorkJobHandlerProxy]
> > (Work-Job-Executor-6:ctx-188ea30f job-181792/job-181802
> ctx-8e7f45ad)
> > (logid:f0888362) Invocation exception, caused by:
> com.cloud.exception.AgentUnavailableException:
> > Resource [Host:22] is unreachable: Host 22: Unable to prepare for
> migration
> > due to Unsupported command issued: com.cloud.agent.api.
> PrepareForMigrationCommand.
> > Are you sure you got the right type of server?
> > 468393:2018-01-27 08:59:35,179 INFO [c.c.v.VmWorkJobHandlerProxy]
> > (Work-Job-Executor-6:ctx-188ea30f job-181792/job-181802
> ctx-8e7f45ad)
> > (logid:f0888362) Rethrow exception com.cloud.exception.
> AgentUnavailableException:
> > Resource [Host:22] is unreachable: Host 22: Unable to prepare for
> migration
> > due to Unsupported command issued: com.cloud.agent.api.
> PrepareForMigrationCommand.
> > Are you sure you got the right type of server?
> >
> > I've tracked this "Unsupported command" down in the CS 4.8 code to
> > cloudstack/api/src/com/cloud/agent/api/Answer.java which is the
> generic
> > answer class. I believe where the error is really being spawned
> from is
> > cloudstack/engine/orchestration/src/com/cloud/
> > vm/VirtualMachineManagerImpl.java. Specifically:
> > Answer pfma = null;
> > try {
> > pfma = _agentMgr.send(dstHostId, pfmc);
> > if (pfma == null || !pfma.getResult()) {
> > final String details = pfma != null ?
> pfma.getDetails() :
> > "null answer returned";
> > final String msg = "Unable to prepare for migration
> due to
> > " + details;
> > pfma = null;
> > throw new AgentUnavailableException(msg, dstHostId);
> > }
> >
> > The pfma returned must be in error or is never returned and therefore
> > still null. That answer appears that it should be coming from the
> > destination agent, but for the life of me I can't figure out what
> the root
> > cause of this error is beyond, "Unsupported command issued". What
> command
> > is unsupported? My guess is that it could be something wrong with
> the dxml
> > that is generated and passed to the destination host, but I have as
> yet
> > been unable to catch that dxml in debug.
> >
> > Any help or guidance is greatly appreciated.
> >
> > Thanks,
> > David Mabry
> >
> >
>
>
>
