Re: [ovirt-users] oVirt 4.0.x - hosted-engine was not starting properly

Hi, please take a look at my inline comments: On Tue, Sep 27, 2016 at 7:23 PM, Gervais de Montbrun < gervais(a)demontbrun.com&gt; wrote: > Hey All, > > Since updating to 4.0.x of oVirt, I have had an issue with my hosted > engine. After a some poking around, I think I have figured out my issue and > thought I would share to see what others think. > The issue has existed with 4.0, 4.0.1, 4.0.2, 4.0.3, and still exists in > 4.0.4. > > Description: > When my hosted engine starts it reports that it is in a degraded state > with 7 or 8 services still not started when I run systemctl status. It > takes about 6 or 7 minutes to eventually start all the services and come > online. If I don't set my cluster to Global-Maintenance mode it eventually > thinks that my hosted-engine needs to be rebooted and restarts it before it > can start everything. > ​Could you please share with us logs gathered by ovirt-log-collector? It's just a guess but could you please take a look if you HE VM has enough entropy? cat /proc/sys/kernel/random/entropy_avail If the value is low (below or around 200), you really need to install and configure some entropy generator such as haveged > Solution: > I realized that Apache was the culprit and found that the proxy to the > ovirt-engine in /etc/httpd/conf.d/z-ovirt-engine-proxy.conf has a super > long timeout with many retries. I changed the settings and now everything > works for me. > > -> Before change: > > <LocationMatch ^/(ovirt-engine($|/)|api($|/)| > RHEVManagerWeb/|OvirtEngineWeb/|ca.crt$|engine.ssh.key.txt$| > rhevm.ssh.key.txt$)> > ProxyPassMatch ajp://127.0.0.1:8702 timeout=3600 retry=5 > > <IfModule deflate_module> > AddOutputFilterByType DEFLATE text/javascript text/css > text/html text/xml text/json application/xml application/json > application/x-yaml > </IfModule> > </LocationMatch> > > > -> After change: > > <LocationMatch ^/ovirt-engine($|/)> > ProxyPassMatch ajp://127.0.0.1:8702 timeout=5 retry=2 > > <IfModule deflate_module> > AddOutputFilterByType DEFLATE text/javascript text/css > text/html text/xml text/json application/xml application/json > application/x-yaml > </IfModule> > </LocationMatch> > > ​This one is correct for 4.0​ ​, not sure why it was not updated during upgrade from 3.6. @Simone? ​

> If I read the timeout settings correctly, it will wait 60 minutes with 5 > retries. 5 hours is way too long for my little server to hold onto all > those apache processes. > The change I made allows for there to be an error, and also releases > apache's hold on the process. Once everything is ready, apache is ready to > serve requests and everything/everyone is happy. Before making the change, > I just get a whitescreen in my browser and then nothing works until I > restart Apache (or I end up in an endless loop of ovirt-ha services > restarting my hosted-engine. > ​Well, if you have an issue with too many apache processes waiting for engine to respond, then there's some issue in engine. As I wrote above please share the logs with us and check entropy. Thanks Martin Perina ​ > > I noticed that this setting reverts to the original setting, so oVirt > must be writing this file. Perhaps these number can be changed in oVirt? If > not, I will just setup and ansible play to revert the settings with working > values and restart apache on my engine. > :-) > > Cheers, > Gervais > > > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >