[ClusterLabs] Ocassionally IPaddr2 resource fails to start

[Donat Zenichev]

Hello and sorry for soo late response of mine, I somehow missed your answer.

Sure let me share a bit of useful information on the count.
First of all the system specific things are:
- Hypervisor is a usual VMware product - VSphere
- VMs OS is: Ubuntu 18.04 LTS
- Pacemaker is of version: 1.1.18-0ubuntu1.1

And yes it's IProute, that has a version - 4.15.0-2ubuntu1

To be mentioned that after I moved to another way of handling this (with
set failure-timeout ) I haven't seen any errors so far, on-fail action
still remains "restart".
But it's obvious, failure-timeout just clears all fail counters for me, so
I don't see any fails now.

Another thing to be mentioned, that monitor functionality for IPaddr2
resource was failing in the years past as well, I just didn't pay much
attention on that.
That time VM machines under my control were working over Ubuntu 14.04 and
hypervisor was - Proxmox of the branch 5+ (cannot exactly remember the
version, perhaps that was 5.4+).

For one this could be a critical case indeed, since sometimes an absence of
IP address (for a certain DB for e.g. with loading of hundreds of thousands
SQL requests) can lead to a huge out age.
I don't have the first idea of how to investigate this further. But, I have
a staging setup where my hands are not tied, so let me know if we can
research something.

And have a nice day!

On Mon, Oct 7, 2019 at 7:21 PM Jan Pokorný <jpokorny at redhat.com> wrote:

> Donat,
>
> On 07/10/19 09:24 -0500, Ken Gaillot wrote:
> > If this always happens when the VM is being snapshotted, you can put
> > the cluster in maintenance mode (or even unmanage just the IP
> > resource) while the snapshotting is happening. I don't know of any
> > reason why snapshotting would affect only an IP, though.
>
> it might be interesting if you could share the details to grow the
> shared knowledge and experience in case there are some instances of
> these problems reported in the future.
>
> In particular, it'd be interesting to hear:
>
> - hypervisor
>
> - VM OS + if plain oblivious to running virtualized,
>   or "the optimal arrangement" (e.g., specialized drivers, virtio,
>   "guest additions", etc.)
>
> (I think IPaddr2 is iproute2-only, hence in turn, VM OS must be Linux)
>
> Of course, there might be more specific things to look at if anyone
> here is an expert with particular hypervisor technology and the way
> the networking works with it (no, not me at all).
>
> --
> Poki
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-- 

Best regards,
Donat Zenichev
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