Hi Igor, I use mod-proxy to balance the apaches/httpds. I use mod-jk t balance the tomcats. For the tomcats f course I also have the workers.properties files in the apache2/conf directory. When invoke the URL to the individual balance members, everything works fine. It is when I try to use the reverse proxy then every attempt to any of the tomcats creates a new session, so fail over does not work.
Thanks, János On Mar 22, 2011, at 6:59 PM, Igor Cicimov wrote: > Interesting I had no idea you can mix mod_proxy and mod_jk, thought you > should use the one or the other. What I do I have workers.properties file in > the Apache conf directory with load-balancer worker that takes care of the > load balancing ans sticky sessions. > > On Wed, Mar 23, 2011 at 8:54 AM, János Löbb <janos.l...@yale.edu> wrote: > >> Hi, >> >> I have two machines bml0065.yalepath.org and bml0066.yalepath.org. Both >> have OSX 10.6.6, apache 2.2.17 and mod_jk 1.2.31 installed. Tomcat is >> 7.0.10 on both. >> >> Apache was compiled on both machines with proxy, proxy-balancer, proxy-http >> and proxy-ajp enabled. >> >> The bml0065 machine is configured as a reverse proxy. >> >> The theory is, that users hit the bml0065 machine like >> >> http://bml0065.yalepath.org/tc/examples/servlets/servlet/SessionExample >> >> and using mod-proxy and mod-proxy-http it will select either bml0065 or >> bml0066 depending on the lbmethod configured. Then let say it selects >> bml0065. Then it comes to this machine as: >> >> http://bml0065.yalepath.org/examples/servlets/servlet/SessionExample >> >> From here, because there is a JkMount for examples in its httpd.conf, it >> connects via mod_jk to the Tomcat instance on this machine, in this case >> tomcat3. >> >> The problem is that as soon the reverse proxy is involved new sessions are >> created all the time, so session failover do not work. If I take the >> reverse proxy out from the picture, everything works. >> >> Here is the reverse proxy config from httpd.conf of the bml0065 machine >> >> JkLogLevel info >> JkMount /examples/* lb >> JkMount /examples/servlets/servlet/* lb >> JkMount /jkmanager/* jkstatus >> JkWorkersFile "/usr/local/apache2/conf/workers.properties" >> JkLogFile "/usr/local/apache2/logs/mod_jk.log >> >> ProxyRequests Off >> <Proxy balancer://pathCluster> >> BalancerMember http://bml0065.yalepath.org loadfactor=10 >> route=tomcat3 >> BalancerMember http://bml0066.yalepath.org loadfactor=10 >> route=tomcat1 >> ProxySet lbmethod=bytraffic >> </Proxy> >> ProxyPass /tc/ balancer://pathCluster/ >> stickysession=JSESSIONID|jsessionid >> ProxyPassReverse /tc/ balancer://pathCluster/ >> >> >> <Location /balancer-manager> >> SetHandler balancer-manager >> Order Deny,Allow >> Allow from .yalepath.org >> </Location> >> >> A very similar setup worked in 2009 with Tomcat 6.0.18 and httpd 2.2.11. >> >> Here are the snippets from both machine catalina.out file >> >> <snip bml0065> >> Mar 22, 2011 5:06:11 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> sessionCreated('0409F29D221545DB0BB5F62205B24471.tomcat3') >> Mar 22, 2011 5:06:11 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> attributeAdded('0409F29D221545DB0BB5F62205B24471.tomcat3', 's1', 't3') >> Mar 22, 2011 5:07:06 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> sessionCreated('DE7A014A0F1659F0B777E0DF4A2355D4.tomcat3') >> Mar 22, 2011 5:07:06 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> attributeAdded('DE7A014A0F1659F0B777E0DF4A2355D4.tomcat3', 's2', 't3') >> </snip> >> >> <snip bml0066> >> Mar 22, 2011 5:06:11 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> sessionCreated('0409F29D221545DB0BB5F62205B24471.tomcat3') >> Mar 22, 2011 5:06:11 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> attributeAdded('0409F29D221545DB0BB5F62205B24471.tomcat3', 's1', 't3') >> Mar 22, 2011 5:07:06 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> sessionCreated('DE7A014A0F1659F0B777E0DF4A2355D4.tomcat3') >> Mar 22, 2011 5:07:06 PM org.apache.catalina.core.ApplicationContext log >> INFO: SessionListener: >> attributeAdded('DE7A014A0F1659F0B777E0DF4A2355D4.tomcat3', 's2', 't3') >> </snip> >> >> >> Here is the last access session from the access_log: >> <snip bml0065> >> 10.84.2.65 - - [22/Mar/2011:17:06:11 -0400] "POST >> /examples/servlets/servlet/SessionExample HTTP/1.1" 200 1114 >> 10.84.2.41 - - [22/Mar/2011:17:06:11 -0400] "POST >> /tc/examples/servlets/servlet/SessionExample HTTP/1.1" 200 1114 >> 10.84.2.65 - - [22/Mar/2011:17:06:11 -0400] "GET >> /examples/servlets/images/code.gif HTTP/1.1" 304 - >> 10.84.2.41 - - [22/Mar/2011:17:06:11 -0400] "GET >> /tc/examples/servlets/images/code.gif HTTP/1.1" 304 - >> 10.84.2.65 - - [22/Mar/2011:17:06:11 -0400] "GET >> /examples/servlets/images/return.gif HTTP/1.1" 304 - >> 10.84.2.41 - - [22/Mar/2011:17:06:11 -0400] "GET >> /tc/examples/servlets/images/return.gif HTTP/1.1" 304 - >> ::1 - - [22/Mar/2011:17:06:18 -0400] "OPTIONS * HTTP/1.0" 200 - >> ::1 - - [22/Mar/2011:17:06:19 -0400] "OPTIONS * HTTP/1.0" 200 - >> 10.84.2.65 - - [22/Mar/2011:17:07:06 -0400] "POST >> /examples/servlets/servlet/SessionExample HTTP/1.1" 200 1114 >> 10.84.2.41 - - [22/Mar/2011:17:07:06 -0400] "POST >> /tc/examples/servlets/servlet/SessionExample HTTP/1.1" 200 1114 >> </snip> >> >> The 10.84.2.41 is my machine. In the log above looks like the hit to the >> reverse proxy - with the /tc/ start - inserted later than the converted url >> for the given balance member. >> >> There is nothing interesting in the apache error_log. >> >> What am I doing wrong ? >> >> This is a test cluster. The application developer wants to test his app's >> failover by pulling the ethernet plug out from the non reverse proxy when >> the session is on that machine. >> >> Thanks ahead, >> >> János >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
