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Re: mod_jk failover and preferring localhost

by daneturner :: Rate this Message:

I just tested with mod_jk 1.2.19 and it still seems as though the distance parameter is being ignored. Output from the status/monitor.page shows mod_jk alternating between tomcats with different distance values in workers.properties.

How can I troubleshoot this further?

Here's my workers.properties...

dane@nuked:/usr/local/etc/apache$ cat workers.properties
workers.tomcat_home=/usr/local/tomcat5.5
workers.java_home=/usr/local/jdk
ps=/
worker.list=tomcat

worker.tomcat.type=lb
worker.tomcat.socket_timeout=195
worker.tomcat.balance_workers=localhost,ritin
worker.tomcat.sticky_session=False

worker.localhost.port=8009
worker.localhost.socket_timeout=195
worker.localhost.host=localhost
worker.localhost.type=ajp13
workers.localhost.distance=10
worker.localhost.lbfactor=1

worker.ritin.port=8009
worker.ritin.host=ritin
worker.ritin.type=ajp13
workers.localhost.distance=20
worker.ritin.lbfactor=1

And some version information...

dane@nuked:~$ grep mod_jk /var/log/apache/error_log |tail -1
[Thu Dec 7 16:13:04 2006] [notice] Apache/1.3.37 (Unix) mod_perl/1.29 mod_ssl/2.8.28 OpenSSL/0.9.7e-p1 mod_jk/1.2.19 configured -- resuming normal operations

Dane

Rainer Jung-3 wrote:

The new attribute distance will help you. It was first implemented for
version 1.2.16, which is in the process of being released (see my other
answer).

Please test and let us know your results.

thuss2 schrieb:
> We have 10 web servers with Tomcat's running on them and a mod_jk
> configuration to prefer the tomcat on localhost and only failover to another
> machine if the local one fails. This worked fine under our older mod_jk,
> however, we just upgraded to 1.2.15 and now it that the local_worker
> properties are no longer supported, it's load balancing every request.
>
> So I checked out the workers.properties options page:
> http://tomcat.apache.org/connectors-doc/config/workers.html and noticed the
> new distance option so that I can give localhost a distance of 0 and
> everything else a greater distance so that the load balancer should always
> prefer localhost. However, it seems to be ignoring the distance property
> completely and load balancing every request. Can anyone suggest what I might
> try to get it to always use the local tomcat for requests unless it fails:
>
> worker.list=tomcat
> worker.tomcat.type=lb
> worker.tomcat.socket_timeout=195
> worker.tomcat.balance_workers=localhost,latin1,latin2,...
> worker.tomcat.sticky_session=False
>
> worker.localhost.port=8009
> worker.localhost.host=localhost
> worker.localhost.type=ajp13
> worker.localhost.lbfactor=1
> worker.localhost.distance=0
>
> worker.latin1.port=8009
> worker.latin1.host=latin1
> worker.latin1.type=ajp13
> worker.latin1.lbfactor=1
> worker.latin1.distance=1
>
> worker.latin2.port=8009
> worker.latin2.host=latin2
> worker.latin2.type=ajp13
> worker.latin2.lbfactor=1
> worker.latin2.distance=1
>
> Thanks,
> Todd
>
> --
> View this message in context: http://www.nabble.com/mod_jk-failover-and-preferring-localhost-t1825380.html#a4979143
> Sent from the Tomcat - User forum at Nabble.com.
>
>
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