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From John_Deli...@ceridian.ca
Subject [users@httpd] mod_balancer_proxy not balancing as expected (not sticky)
Date Wed, 18 Aug 2010 20:34:48 GMT
Hello,

I'm trying to configure Apache as a reverse proxy to load balance across 3 
web/app servers.  It must be sticky for sessions to work properly, and 
JSESSIONID is apparently the value I should use for this app.

For some reason, even though it detects the JSESSIONID value and assigns 
the request to the correct route, the request is routed to an incorrect 
(ie didn't remain sticky) server.  For example, it sends me to app1 then 
app2.  I thought if I started with app1 it would stick with app1 assuming 
it detected my JSESSIONID.  For some reason, it's jumping all around.  See 
debug log below and you'll see the way it's doing this.

RHEL 5.5
Server version: Apache/2.2.3
Server built:   Mar  4 2010 09:57:54
Server's Module Magic Number: 20051115:3
Server loaded:  APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/etc/httpd"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="run/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="logs/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

Here's my config:
----------------------
NameVirtualHost *:80
NameVirtualHost *:8080

ProxyVia Full

<VirtualHost *:80>
  ServerName bwd1finpxy01.corpadds.com
</VirtualHost>

<VirtualHost *:8080>
  LogLevel Debug
  ServerName oebs.finprod.ceridian.net

  ProxyRequests     Off

  <Proxy *>
    Order deny,allow
    Allow from all
  </Proxy>

  <Location /balancer-manager>
        SetHandler balancer-manager
        Order Deny,Allow
        Deny from all
        Allow from 10.0.0.0/8
        Allow from 170.153.0.0/16
        Allow from 127.0.0.1
  </Location>


  ProxyPreserveHost On
  ProxyPass /balancer-manager !
  ProxyPass / balancer://internalapp/ lbmethod=byrequests 
stickysession=JSESSIONID|jsessionid nofailover=On
  ProxyPassReverse  / balancer://internalapp/

  <Proxy balancer://internalapp>
        BalancerMember http://bwd1finapp01.corpadds.com:8001 route=app01 
loadfactor=1
        BalancerMember http://bwd1finapp02.corpadds.com:8001 route=app02 
loadfactor=1
        BalancerMember http://bwd1finapp03.corpadds.com:8001 route=app03 
loadfactor=1
  </Proxy>

</VirtualHost>

---------------------------------------

and here's some output from the debug log, where you see it sending 
requests to different bancer members:

-------------------------------------
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(276): proxy: 
BALANCER: Found value 
de92e7414f39683a7a8066a272f1271fe0e55951b07c202f1799f225c14459b8.e38Lax8PchqPbO0TbhqNahmRc3b0

for stickysession JSESSIONID|jsessionid
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(286): proxy: 
BALANCER: Found route e38Lax8PchqPbO0TbhqNahmRc3b0
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(535): proxy: 
BALANCER (balancer://internalapp) worker (
http://bwd1finapp02.corpadds.com:8001) rewritten to 
http://bwd1finapp02.corpadds.com:8001/OA_HTML/AppsLogin
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(276): proxy: 
BALANCER: Found value 
de92e7414f39683a7a8066a272f1271fe0e55951b07c202f1799f225c14459b8.e38Lax8PchqPbO0TbhqNahmRc3b0

for stickysession JSESSIONID|jsessionid
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(286): proxy: 
BALANCER: Found route e38Lax8PchqPbO0TbhqNahmRc3b0
[Wed Aug 18 13:57:49 2010] [debug] mod_proxy_balancer.c(535): proxy: 
BALANCER (balancer://internalapp) worker (
http://bwd1finapp03.corpadds.com:8001) rewritten to 
http://bwd1finapp03.corpadds.com:8001/OA_HTML/AppsLocalLogin.jsp?langCode=US
[Wed Aug 18 13:57:54 2010] [debug] mod_proxy_balancer.c(276): proxy: 
BALANCER: Found value 
de92e7414f39683a7a8066a272f1271fe0e55951b07c202f1799f225c14459b8.e38Lax8PchqPbO0TbhqNahmRc3b0

for stickysession JSESSIONID|jsessionid
[Wed Aug 18 13:57:54 2010] [debug] mod_proxy_balancer.c(286): proxy: 
BALANCER: Found route e38Lax8PchqPbO0TbhqNahmRc3b0
[Wed Aug 18 13:57:54 2010] [debug] mod_proxy_balancer.c(535): proxy: 
BALANCER (balancer://internalapp) worker (
http://bwd1finapp03.corpadds.com:8001) rewritten to 
http://bwd1finapp03.corpadds.com:8001/OA_HTML/RF.jsp?function_id=28566&resp_id=-1&resp_appl_id=-1&security_group_id=0&lang_code=US&params=PxXpiqMs416s7FG5eW95o8UFiVkywaIKgiQWsKNGTFY&oas=L2Ypksutic3wM1XKz7SKEg.
.
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(276): proxy: 
BALANCER: Found value 
de92e7414f39683a7a8066a272f1271fe0e55951b07c202f1799f225c14459b8.e38Lax8PchqPbO0TbhqNahmRc3b0

for stickysession JSESSIONID|jsessionid
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(286): proxy: 
BALANCER: Found route e38Lax8PchqPbO0TbhqNahmRc3b0
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(535): proxy: 
BALANCER (balancer://internalapp) worker (
http://bwd1finapp01.corpadds.com:8001) rewritten to 
http://bwd1finapp01.corpadds.com:8001/OA_HTML/cabo/styles/cache/swanEXTN-custom-2_3_6_5-en-gecko.css
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(276): proxy: 
BALANCER: Found value 
de92e7414f39683a7a8066a272f1271fe0e55951b07c202f1799f225c14459b8.e38Lax8PchqPbO0TbhqNahmRc3b0

for stickysession JSESSIONID|jsessionid
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(286): proxy: 
BALANCER: Found route e38Lax8PchqPbO0TbhqNahmRc3b0
[Wed Aug 18 13:57:55 2010] [debug] mod_proxy_balancer.c(535): proxy: 
BALANCER (balancer://internalapp) worker (
http://bwd1finapp02.corpadds.com:8001) rewritten to 
http://bwd1finapp02.corpadds.com:8001/OA_HTML/cabo/jsLibs/Common2_3_6_5.js
----------------------------------------


Any suggestions or tips regarding debugging this would be appreciated.




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