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

[aleksey.maksimov at it-kb.ru]

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.

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.