[ovirt-users] Is it possible to recover from a failed Engine host?

[~Stack~]

On 05/02/2018 07:27 AM, Alexander Wels wrote:
> On Wednesday, May 2, 2018 8:03:53 AM EDT ~Stack~ wrote:
>> Greetings,
>>
>> I have a dev environment where it seems the hard drive on our Engine
>> host kicked the bucket (Yeah, I know. Smartmon. I watch it closely on
>> the systems I care about - this was a learning environment for me so I
>> didn't).
>>
>> The Hypervisors are fine and the VM's running on the Hypervisors are
>> fine...But I can't manage any of the Hypervisors. To make things a bit
>> more tricky, the SQL and the backups were on the drive that died. I
>> really don't have anything from that host. It's dev. I can rebuild. But
>> it is also a learning environment for me so might as well use this to learn.
>>
>> Is it possible for me to build a new Engine host and attach it to an
>> existing hypervisor environment? Better yet, would this be something I
>> could do as a hosted-engine-deploy? (something I haven't experimented
>> with yet.)
>>
>> Again, this is a play ground so if it goes horrifically wrong...oh well.
>> But I would really like to try to recover it for the learning
>> experience. I've been poking around in the documentation but I haven't
>> seen anything that seems to address this issue directly.
>>
>> Thoughts?
>>
>> Thanks!
>> ~Stack~
> 
> As long as the storage domain is in tact you should be able to recover 
> everything. And it does sound like this is the case as the VMs are still 
> running. Basically you just install a new engine somewhere and then do the 
> following:
> 
> - Create new Data Center
> - Create new Cluster
> - You will need a host to add to your cluster. Add this host.
> - Create a small temporary storage domain, this will allow you to bring up the 
> data center which in turn will allow you to IMPORT the existing storage 
> domain.
> - Once the DC is up, you can 'import' the existing storage domain, it will 
> warn you that the storage domain is still attached to another DC, but since 
> that engine is gone, you can ignore that.
> - Once the new DC is imported you can stop/detach/remove the small temporary 
> storage domain, which will make the imported storage domain, the master 
> domain.
> 
> Once all that is done, you can simply go to the storage domain, and 'import' 
> whatever VM/template you have stored on the storage domain, and it will show 
> up in the VM/template list. Then you add all your hosts and you should have a 
> running environment again.
> 

Thank you! I will give it a try and see what happens.
~Stack~


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