[ovirt-users] heavy webadmin

Tue Apr 5 02:00:45 UTC 2016

On Mon, 2016-04-04 at 14:51 -0400, Alexander Wels wrote:
> On Monday, April 04, 2016 02:34:33 PM you wrote:
> > It is a hosted engine setup with the host on a physical  server.  I
> > wasn't
> > aware  that the engine used the entropy.  What do
> > you  recommend  to fix
> > it?
> > 
> 
> Okay, if it is a 3.6 then you should be able edit the hosted engine
> VM in the 
> UI itself. I haven't done any self hosted engine myself but there are
> some 
> things you can't edit, not sure if the rng is one of them. Anyway if
> you can 
> edit the hosted engine VM then open up the advanced options (bottom
> left 
> button in popup), then click the random generator side tab, and check
> the 
> random generator enabled button (if it is not checked already that
> is).
> 
> As far as I know that should be enought to have the random passed
> from the 
> host to the VM and that should improve the entropy on the host
> engine. You 
> might have to restarted the hosted engine VM for it to take effect.
> 
> If the above is not possible or doesn't work, I would go with yum
> install 
> haveged, then chkconfig haveged on, service haveged start or if it is
> centos 7 
> then its systemctl haveged enable and systemctl haveged start.
> 
> > 
> > Sent from my Verizon Wireless 4G LTE smartphone-------- Original
> > message
> > --------From: Alexander Wels <awels at redhat.com> Date:
> > 04/04/2016  13:57 
> > (GMT-05:00) To: biholcomb at l1049h.com Subject: Re: [ovirt-users]
> > heavy
> > webadmin
> > On Monday, April 04, 2016 12:55:55 PM you wrote:
> > > On Mon, 2016-04-04 at 08:41 -0400, Alexander Wels wrote:
> > > > On Sunday, April 03, 2016 03:30:29 PM Brett I. Holcomb wrote:
> > > > > On Sun, 2016-04-03 at 21:20 +0200, Nicolas Ecarnot wrote:
> > > > > > Le 03/04/2016 17:13, Greg Sheremeta a écrit :
> > > > > > > We have patches in review that should fix this in 3.6.5.
> > > > > > > The
> > > > > > > underlying
> > > > > > > problem is a couple of JavaScript memory leaks.
> > > > > > 
> > > > > > God bless you!
> > > > > > 
> > > > > > Since 3.6.2 or 3.6.3, the web admin is getting close to
> > > > > > unusable
> > > > > > after
> > > > > > some minutes (Firefox or Chrome, windows or Linux).
> > > > > > Alex Wels helped me try to debug this, but though much time
> > > > > > spent
> > > > > > on
> > > > > > this, we failed.
> > > > > > In a way, I'm satisfied other people are also expressing
> > > > > > the
> > > > > > same
> > > > > > frustration about this issue, if that can help to debug.
> > > > > > 
> > > > > > Thank you.
> > > > > 
> > > > > Thank you also.  I'm on 3.6.4 just released version and it
> > > > > can take
> > > > > 5+
> > > > > minutes to go from the welcome page to the admin login page
> > > > > and
> > > > > then
> > > > > the interface is slow and frequently throws exceptions. 
> > > > 
> > > > Two things to check if going from the welcome page to the login
> > > > page
> > > > is THAT
> > > > show.
> > > > 
> > > > 1. Make 100% sure your DNS is setup correctly (or your
> > > > /etc/hosts if
> > > > that is
> > > > what you use). If the engine cannot resolve itself, it will
> > > > create
> > > > lots of
> > > > issues.
> > > > 2. If you are running hosted engine, make sure you have enough
> > > > entropy, the
> > > > login page generates a couple of tokens using secure random,
> > > > which
> > > > eats away
> > > > at your entropy budget heavily and since hosted engine is a VM
> > > > it is
> > > > possible
> > > > that you don't have enough entropy. You can check your entropy
> > > > level
> > > > with
> > > > this:
> > > > 
> > > > cat /proc/sys/kernel/random/entropy_avail
> > > > 
> > > > There are several options for solving the entropy problem if
> > > > that is
> > > > the case.
> > > 
> > > DNS is 200% working  .  All hosts are resolvable from any
> > > where on
> > > the network and host can see engine and vice versa.
> > > Entropy problems makes more sense.  I'd forgotten about this
> > > being a VM
> > > and I've run into the issue generating certs on VMware guests.  I
> > > have
> > > entropy_avail value of 159.  Is that good or bad and if bad what
> > > do I
> > > need to do.
> > 
> > 159 is horrible to be honest, that is most likely the cause of your
> > problems. Anything below around 300 is bad.
> > 
> > I am assuming this is not a hosted engine since you said you forgot
> > this is
> > actually a virtual machine. So you are running some other kind of
> > VM manager
> > to host the engine. The best thing to do is check if there is a way
> > for
> > your manager to pass sources of random to the VM. In oVirt its a
> > couple of
> > check boxes in the cluster setup and the VM setup. Obviously I
> > don't know
> > what you are using so I can't comment on that.
> > 
> > Another thing you can do is install some kind of psuedo random
> > generator
> > like haveged or rngd. I know for a fact you can simply 'yum install
> > haveged' and it will work (someone else had the same problem and
> > solved it
> > that way).
> > 
> > It all depends on your level of needed security and VM manager,
> > there are
> > also physical sources of random generation like usb sticks and
> > stuff.
> 
I installed haveged and the available is up around 2500+ now.  The
server has a mouse and keyboard but it's not used much since
connections are done via ssh.
Thanks.
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