perfSONAR User Q&A and Other Discussion

[Trond Endrestøl <>]

On Fri, 6 Oct 2017 20:18+0200, Trond Endrestøl wrote:

> On Fri, 6 Oct 2017 10:49-0400, Andrew Lake wrote:
> 
> > I think there is indeed an issue with cassandra’s default config and
> > IPv6-only hosts. Can you try the following:
> > 
> > 1. Open  /etc/cassandra/conf/cassandra-env.sh
> > 2. Find and comment-out the line JVM_OPTS=“$JVM_OPTS -Djava.net
> > .preferIPv4Stack=true”
> > 3. Save the changes.
> > 4. Restart cassandra with systemctl restart cassandra
> > 
> > Might want to double check there are no other references to
> > -Djava.net.preferIPv4Stack=true
> > in that file, mine just had the one. Also since you have been changing
> > /etc/hosts, make sure localhost still resolves to ::1. Its possible we may
> > need to play with the Java opts some more, but hopefully that is all you
> > need. Seems to be a known issue with cassandra. We aren’t the authors of
> > the cassandra RPM, but if that indeed fixes your issue we can look at
> > having one of our packages correct that issue on install (it won’t be the
> > first time we have had to some hand-holding for cassandra’s RPM).
> > 
> > Also, as an aside, there should be no requirement to disable your 
> > firewall.
> > I think you said that didn’t work anyways but all communication with
> > cassandra is done on localhost and should not be affected by the host
> > firewall.
> 
> I reverted all my IPv4 perversion, commented out the IPv4Stack line in 
> /etc/cassandra/conf/cassandra-env.sh, and rebooted the whole system.
> 
> Cassandra might be running IPv6 only now, but the web interface shows 
> Error loading test listing: Internal Server Error. Previously it 
> showed something else, but no results from any test.

I added my fake IPv4 address, and restarted Apache. Still no 
improvement. I made the IPv4 address resolvable via /etc/hosts, and 
restarted Apache again. Now the web interface shows "Test Results (No 
Results)". Maybe it's time to tinker with /etc/httpd/*.

-- 
Trond.