[ovirt-users] hosted engine setup failed for 10 minutes delay.. engine seems alive

[Simone Tiraboschi]

On Mon, May 2, 2016 at 9:15 PM, Gianluca Cecchi
<gianluca.cecchi at gmail.com> wrote:
>
>
> On Mon, May 2, 2016 at 8:39 PM, Gianluca Cecchi <gianluca.cecchi at gmail.com>
> wrote:
>>
>> On Mon, May 2, 2016 at 11:14 AM, Simone Tiraboschi <stirabos at redhat.com>
>> wrote:
>>>
>>>
>>> >>>
>>> >>> Can you please check the entropy value on your host?
>>> >>>  cat /proc/sys/kernel/random/entropy_avail
>>> >>>
>>> >>
>>> >> I have not at hand now the server. I'll check soon and report
>>> >> Do you mean entropy of the physical server that will operate as
>>> >> hypervisor?
>>>
>>> On the hypervisor
>>>
>>> > That's a good question. Simone - do you know if we start the guest with
>>> > virtio-rng?
>>>
>>> AFAIK we are not.
>>>
>>
>> On the only existing hypervisor, just after booting and exiting global
>> maintenance, causing hosted engine to start, I have
>>
>> [root at ovirt01 ~]# uptime
>>  20:34:17 up 6 min,  1 user,  load average: 0.23, 0.20, 0.11
>>
>> [root at ovirt01 ~]# cat /proc/sys/kernel/random/entropy_avail
>> 3084
>>
>> BTW on the self hosted engine VM:
>> [root at ovirt ~]# uptime
>>  18:35:33 up 4 min,  1 user,  load average: 0.06, 0.25, 0.13
>>
>> [root at ovirt ~]# cat /proc/sys/kernel/random/entropy_avail
>> 14
>>
>> On the hypervisor:
>> [root at ovirt01 ~]# ps -ef | grep [q]emu | grep virtio-rng
>> [root at ovirt01 ~]#
>>
>> On engine VM:
>> [root at ovirt ~]# ll /dev/hwrng
>> ls: cannot access /dev/hwrng: No such file or directory
>> [root at ovirt ~]#
>>
>> [root at ovirt ~]# lsmod | grep virtio_rng
>> [root at ovirt ~]#
>>
>> May I change anything so that engine VM has virtio-rng enabled?
>>
>> Gianluca
>>
>>
>
> I verified very slow login time in webadmin after welcome page, with my
> configuration that is for now based on /etc/hosts.
> After reading a previous post, and having after about 30 minutes only 114 as
> entropy in hosted engine vm, I made this in engine VM:

Thanks for your report Gianluca,
adding virtio-rng or adding haveged daemon to the appliance is indeed
a good idea: could you please fill an RFE on bugzilla for that?

> yum install haveged
> systemctl enable haveged
>
> put host in global maintenance
> shutdown engine VM
> exit from maintenance
>
> engine VM starts and immediately I have:
>
> [root at ovirt ~]# uptime
>  19:05:10 up 0 min,  1 user,  load average: 0.68, 0.20, 0.07
>
> [root at ovirt ~]# cat /proc/sys/kernel/random/entropy_avail
> 1369
>
> And login in web admin page now almost immediate....
>
> Inside the thread I read:
> http://lists.ovirt.org/pipermail/users/2016-April/038805.html
>
> it wasn't clear if I can edit the engine VM in webadmin (or other mean) and
> enable the random generator option or if the haveged way is the one to go
> with in case of self hosted engine....
> Is there a list of what I can change (if any) and what not for the engine
> VM?
> For example I would like to change the time zone that is GMT now (I think
> inherited from the OVF of the appliance?)
>
> Thanks,
> Gianluca
>