[ovirt-users] Recovering hosted-engine

[Yedidyah Bar David]

On Mon, Jul 3, 2017 at 3:46 PM, Andrew Dent <adent at ctcroydon.com.au> wrote:
> Has anyone successfully completed a hosted-engine recovery on a multiple
> host setup with production VMs?

I'd like to clarify that "recovery" can span a large spectrum of
flows, from a trivial "I did some change to the engine database
that broke stuff and I want to restore a backup I took prior to
this change" to a full system restoration including purchasing
and deploying new (perhaps different) hosts/network/storage
hardware, including many other flows in between.

So when you plan for recovery, you should define very well what
flows you plan to handle, and how you handle each.

The linked procedure correctly says it's "providing an example".

>
> Kind regards
>
>
> Andrew
>
>
>
> ------ Original Message ------
> From: "Andrew Dent" <adent at ctcroydon.com.au>
> To: "users" <users at ovirt.org>
> Sent: 2/07/2017 2:22:16 PM
> Subject: [ovirt-users] Recovering hosted-engine
>
> Hi
>
> A couple of questions about hosted-engine recovery.
> Part way through this URL, in the section "Workflow for Restoring the
> Self-Hosted Engine Environment"
> http://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self-Hosted_Environment/
> it looks like once the hosted-engine is recovered on Host 1, the VMs on Host
> 2 and 3 will be running, but not accessible to the recovered Hosted Engine.
> Is that correct?

I am pretty certain that the procedure assumed that all hosts need restoration,
not that some are still up-and-running.

> If so, how to you remove host 2 and host 3 from the environment, then add
> back in again while keeping the VMs running?

That's a good question.

Please try to describe the exact flow you have in mind. What's broken and
needs restoration, and how do you plan to do that?

>
> Host 2 and Host 3 are not recoverable in their current state. These hosts
> need to be removed from the environment, and then added again to the
> environment using the hosted-engine deployment script. For more information
> on these actions, see the Removing Non-Operational Hosts from a Restored
> Self-Hosted Engine Environment section below and Chapter 7: Installing
> Additional Hosts to a Self-Hosted Environment.
>
> BTW: The link referring to chapter 7 is broken.

You are right. The link in the bottom of the page seems working.
Now pushed [1] to fix. Thanks for the report!

[1] https://github.com/oVirt/ovirt-site/pull/1056

Best,
-- 
Didi