Sharing mod_proxy_balancer session data with multiple virtual hosts

[Jonathan Knight <j.knight@xxxxxxxxxxxxxxx>]

I'm building a load balancer using apache.  We have to support both SSl 
and non-SSL sessions and the problem I'm trying to solve is how to get 
both virtual hosts to share session data so that a when a connection is 
sent to the non-SSL port, it is proxied to the same server as the SSL 
session.

Here's a bit of httpd.conf.  This one will correctly proxy SSL and 
non-SSL sessions but won't necessarily use the same server from the same 
client.

My fallback plan is to force SSL for everything which will overcome the 
difficulty, but I am interested in knowing if there is a way of sharing 
session data between virtual hosts.



Listen 160.5.xx.yy:80
Listen 160.5.xx.yy:443

<VirtualHost 160.5.xx.yy:80>
  ServerName zzzz.keele.ac.uk
  ServerAdmin j.knight@xxxxxxxxxxxxxxx

  CustomLog /var/log/httpd/logs/staff/access_log common
  ErrorLog /var/log/httpd/logs/staff/error_log
  LogLevel debug

  <Proxy balancer://staffcluster/>
    BalancerMember http://server1.keele.ac.uk
    BalancerMember http://server2.keele.ac.uk
  </Proxy>

  ProxyRequests off
  ProxyPreserveHost on
  ProxyPass /balancer-manager !
  ProxyPass / balancer://staffcluster/ stickysession=JSESSIONID 
lbmethod=bybusyness
  ProxyPassReverse / balancer://staffcluster/

</VirtualHost>

<VirtualHost 160.5.xx.yy:443>
  ServerName zzzz.keele.ac.uk
  ServerAdmin j.knight@xxxxxxxxxxxxxxx

  CustomLog /var/log/httpd/logs/staff/access_log common
  ErrorLog /var/log/httpd/logs/staff/error_log
  LogLevel debug

  <Location /balancer-manager>
    SetHandler balancer-manager
    Order deny,allow
    Deny from all
    Allow from 160.5.zz
  </Location>

  <Proxy balancer://staffcluster/>
    BalancerMember https://server1.keele.ac.uk
    BalancerMember https://server2.keele.ac.uk
  </Proxy>

  ProxyRequests off
  ProxyPreserveHost on
  ProxyPass /balancer-manager !
  ProxyPass / balancer://staffcluster/ stickysession=JSESSIONID 
lbmethod=bybusyness
  ProxyPassReverse / balancer://staffcluster/

  SSLEngine on
  SSLProxyEngine on
#  SSLCipherSuite 
ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL
  SSLCertificateFile /usr/local/apache2/conf/cert.crt
  SSLCertificateKeyFile /usr/local/apache2/conf/key.crt
  SSLCACertificateFile /usr/local/apache2/conf/cacert.crt

</VirtualHost>



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