3:39 a.m.
Re-raising this for discussion.
As I commented on the bug, Hosted Engine is such a special use case in
terms of setup, configuration, and migration that I'm not sure engine
itself is the right place to handle this. We have the option of changing
the ha broker|agent to use the engine API to initiate migrations, but
there's still a risk that the hosts in the secondary cluster will not be
able to reach the storage, etc.
It would be great to get this resolved if there's not currently a way to do
it, but we need to decide on a long-term direction for it. Currently, HE
can run on additional hosts in the datacenter as an emergency fallback, but
it reverts once the HE cluster is back out of maintenance. My ideal would
be to extend the hosted-engine utility with an additional parameter which
reaches out to the Engine API in order to handle the needed database
updates after some safety checks (probably over ansible) to ensure that the
HE storage domain is reachable from hosts in the other cluster.
But I'm not a hosted engine expert. Is there currently a way to do this? If
there isn't, do we want to add additional logic to ha agent|broker, or
reach out to the Engine?
On Tue, Jan 15, 2019 at 8:27 AM Douglas Duckworth <dod2014(a)med.cornell.edu>
wrote:
Hi
I opened a BugZilla at https://bugzilla.redhat.com/show_bug.cgi?id=1664777
but no steps have been shared on how to resolve. Does anyone know how this
can be fixed without destroying the data center and building a new hosted
engine?
Thanks,
Douglas Duckworth, MSc, LFCS
HPC System Administrator
Scientific Computing Unit <https://scu.med.cornell.edu>
Weill Cornell Medicine
1300 York Avenue
New York, NY 10065
E: doug(a)med.cornell.edu
O: 212-746-6305
F: 212-746-8690
On Wed, Jan 9, 2019 at 10:22 AM Douglas Duckworth <dod2014(a)med.cornell.edu>
wrote:
> Hi
>
> Should I open a Bugzilla to resolve this problem?
>
> Thanks,
>
> Douglas Duckworth, MSc, LFCS
> HPC System Administrator
> Scientific Computing Unit <https://scu.med.cornell.edu>
> Weill Cornell Medicine
> 1300 York Avenue
> New York, NY 10065
> E: doug(a)med.cornell.edu
> O: 212-746-6305
> F: 212-746-8690
>
>
> On Wed, Dec 19, 2018 at 1:13 PM Douglas Duckworth <
> dod2014(a)med.cornell.edu> wrote:
>
>> Hello
>>
>> I am trying to migrate my hosted-engine VM to another cluster in the
>> same data center. Hosts in both clusters have the same logical networks
>> and storage. Yet migrating the VM isn't an option.
>>
>> To get the hosted-engine VM on the other cluster I started the VM on
>> host in that other cluster using "hosted-engine --vm-start."
>>
>> However HostedEngine still associated with old cluster as shown
>> attached. So I cannot live migrate the VM. Does anyone know how to
>> resolve? With other VMs one can shut them down then using the "Edit"
>> option. Though that will not work for HostedEngine.
>>
>>
>> Thanks,
>>
>> Douglas Duckworth, MSc, LFCS
>> HPC System Administrator
>> Scientific Computing Unit <https://scu.med.cornell.edu>
>> Weill Cornell Medicine
>> 1300 York Avenue
>> New York, NY 10065
>> E: doug(a)med.cornell.edu
>> O: 212-746-6305
>> F: 212-746-8690
>>
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