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.
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>
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.
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
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