> -----Original Message----- > From: Andy Davidson [mailto:andy@xxxxxxxxxxxx] > Sent: Friday, May 11, 2007 2:53 PM > To: users@xxxxxxxxxxxxxxxx > Subject: [Bulk] Apache 2.2 and proxy_balancer - > tcp session pipelining > > > Hi, > > I first posted this question to > comp.infosystems.www.servers.unix but had no response. > > mod_proxy_balancer is cool - I like this, guys, thank you. > > I want to load balance a number of back-end worker/target > servers that host one web application. This is easy to do : > > <Proxy balancer://mysite> > Order allow,deny > Allow from all > BalancerMember http://10.1.2.3:80 > BalancerMember http://10.1.2.4:80 > </Proxy> > ProxyPass /r balancer://mysite/ > ProxyPassReverse /r balancer://mysite/ > > Now, what I want to do this time is configure my reverse > proxy server to open several connections to each of the back > end worker servers when the proxy starts to my back end hosts > so that the tcp session can be pipelined, thus preventing the > burden of creating and tearing down tcp sessions on the back > end boxes for new visitor requests. > > I found some documentation on the httpd.apache.org website > which seemed to describe what I want to do : > > Parameter Default Description > min 0 Minumum number of connections > that will always be open to the backend server. > http://httpd.apache.org/docs/2.2/mod/mod_proxy.html > > However, this doesn't cleanly map on to the balancer model. > If I add 'min=4' to the BalancerMember line this is ignored, > and if I add the same to the 'ProxyPass' lines, apache does > not understand the configuration. > > > Anyone thought of a way around this ? Is it a feature request ? > > TIA > If you are using the preform MPM you have one server process for each Apache worker. Therefore each apache worker opens exactly one connection to the back end so max per worker always == 1 and your "real max" connections to the backend <= number of Apache workers. With the Prefork MPM, I don't believe there is way to limit the number of Apache workers which will actually open connections to the backend. If you want to avoid this issue and limit the conenctions to the backend you can use the "Worker" MPM which is multithreaded. In this case the "max" for the balancer should be respected. Ryan Murray managing director element^n berytech technology centre mkalles-beirut, lebanon +961 4 533 040 ext. 3030 (office) +961 3 767 083 (lebanon mobile) +973 3603 9118 (bahrain mobile) www.elementn.com This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure, or distribution is prohibited. If you are not the intended recipient(s) please contact the sender by reply email and destroy all copies of the original message and any attachments. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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