[ovirt-users] Slow first opening web portal when the ovirt-engine.service is restarted

[Simone Tiraboschi]

On Mon, Oct 3, 2016 at 12:17 PM, <aleksey.maksimov at it-kb.ru> wrote:

> Wow. I have installed and enabled the service on Hosted Engine VM:
>
> # yum -y install haveged
> # service haveged start
> # systemctl enable haveged.service
> # service haveged status
>
> Redirecting to /bin/systemctl status  haveged.service
> ● haveged.service - Entropy Daemon based on the HAVEGE algorithm
>    Loaded: loaded (/usr/lib/systemd/system/haveged.service; enabled;
> vendor preset: disabled)
>    Active: active (running) since Mon 2016-10-03 12:56:24 MSK; 2min 12s ago
>      Docs: man:haveged(8)
>            http://www.issihosts.com/haveged/
>  Main PID: 5304 (haveged)
>    CGroup: /system.slice/haveged.service
>            └─5304 /usr/sbin/haveged -w 1024 -v 1 --Foreground
>
> Oct 03 12:56:24 KOM-AD01-OVIRT1 systemd[1]: Started Entropy Daemon based
> on the HAVEGE algorithm.
> Oct 03 12:56:24 KOM-AD01-OVIRT1 systemd[1]: Starting Entropy Daemon based
> on the HAVEGE algorithm...
> Oct 03 12:56:24 KOM-AD01-OVIRT1 haveged[5304]: haveged: ver: 1.9.1; arch:
> x86; vend: GenuineIntel; build: (gcc 4.8.2 ITV); collect: 128K
> Oct 03 12:56:24 KOM-AD01-OVIRT1 haveged[5304]: haveged: cpu: (L4 VC);
> data: 32K (L2 L4 V); inst: 32K (L2 L4 V); idx: 21/40; sz: 32709/60538
> Oct 03 12:56:24 KOM-AD01-OVIRT1 haveged[5304]: haveged: tot tests(BA8):
> A:1/1 B:1/1 continuous tests(B):  last entropy estimate 8.00013
> Oct 03 12:56:24 KOM-AD01-OVIRT1 haveged[5304]: haveged: fills: 0,
> generated: 0
>
>
> And now after restarting the ovirt-engine.service, first open the web
> portal pages is instantaneous!
> It works.
> Thank you.
>

Yes, the issue was the lack of entropy.
haveged on a VM works but the quality of its entropy is still debated.
A better solution is to use the paravirtualized VirtIO RNG device.

We already have it on the first boot; we are working to ensure it's always
there also after the engine imported the engine VM:
https://gerrit.ovirt.org/#/c/62334/


>
> But now the question arises, in what cases can be a helpful
> ovirt-warmup.service (https://github.com/geertj/
> ravstack/blob/master/share/ovirt-warmup.service) ?
>
> 03.10.2016, 12:32, "Sandro Bonazzola" <sbonazzo at redhat.com>:
> > This looks like not enough entropy on the host / guest running
> ovirt-engine.
> > If you're on Hosted Engine I suggest to install haveged (in EPEL repo)
> and run it to ensure enough entropy is available for the VM.
> > Adding Simone.
>
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