Re: [rt-users] Load balancer and RT
Thierry: We don't use proxy , we use linux virtual servers and keepalived to balance the traffic into 2 RT web servers. I am sorry I have no real experience with using Proxy so cannot help you. In our case keepalived takes care of maintaining session state, when ever we tested a failure of the web servers, the users RT session were not interrupted with the exception of little glitch when the network adjusted itself. Our each RT instance is a VirtualHost rt.mycompany.com:443 , the rest of the RT apache configuration is similar to yours. Roy -Original Message- From: Thierry Thelliez [mailto:thierry.thelliez.t...@gmail.com] Sent: 03 February 2011 18:31 To: Raed El-Hames Cc: rt-users@lists.bestpractical.com Subject: Re: [rt-users] Load balancer and RT Roy, Thanks for your answer. Could you please tell me more about your proxy settings? We have a virtual host definition like the following. Yesterday we started adding the ProxyPreserveHost, ProxyVia, ProxyPassReverseCookieDomain while chasing the session mix up issues. It is still happening although very rarely. And it is hard to reproduce on demand... This virtual host points to two RT instances. RewriteEngine on RewriteRule ^/(.*) - [P,QSA] ProxyPreserveHost ON ProxyVia Full KeepAlive On ProxyPassReverseCookieDomain mydomain.com Proxy balancer://proxy-balancer BalancerMemberhttp://xxx.xxx.xxx.xx1/rt_demo BalancerMemberhttp://xxx.xxx.xxx.xx2/rt_demo /Proxy ProxyPass /rt_demo balancer://proxy-balancer And on each RT instance we have the 'classic' setup: Alias /rt_demo /opt/rt3/share/html PerlModule Apache2::compat PerlModule Apache::DBI PerlRequire /opt/rt3/bin/webmux.pl AddOutputFilterByType DEFLATE application/x-javascript text/css text/html Location /rt/NoAuth Order allow,deny Allow from all Satisfy any /Location Location /rt/REST/1.0/NoAuth Order allow,deny Allow from all Satisfy any /Location Directory /opt/rt3/share/html AllowOverride All Options ExecCGI FollowSymLinks AddDefaultCharset UTF-8 SetHandler perl-script PerlHandler RT::Mason /Directory Thanks, Thierry
Re: [rt-users] Load balancer and RT
Roy, Thanks for the info. May I ask you what you use for the backend? I am assuming that your 2 RT web servers are connected to the same MySQL? What redundancy architecture have you adopted? Thanks again. Thierry
Re: [rt-users] Load balancer and RT
Thierry: If you are storing the sessions data in the database you should n't have any problems. We 've been running our RT on 2 boxes behind LVS for the past few years without any major issues. The occasional keep alive hiccups which tend to be fixed pretty quickly without any major impact. Roy -Original Message- From: rt-users-boun...@lists.bestpractical.com [mailto:rt-users- boun...@lists.bestpractical.com] On Behalf Of Thierry Thelliez Sent: 03 February 2011 05:25 To: rt-users@lists.bestpractical.com Subject: [rt-users] Load balancer and RT Hello, For availability more than scalability, we would like to run two instances of RT (different hardware). Are there some issues to look for? Right now we have a simple Apache based load balancer but we are getting user session mix up. Any experience implementing such configuration? Thanks, Thierry
Re: [rt-users] Load balancer and RT
Roy, Thanks for your answer. Could you please tell me more about your proxy settings? We have a virtual host definition like the following. Yesterday we started adding the ProxyPreserveHost, ProxyVia, ProxyPassReverseCookieDomain while chasing the session mix up issues. It is still happening although very rarely. And it is hard to reproduce on demand... This virtual host points to two RT instances. RewriteEngine on RewriteRule ^/(.*) - [P,QSA] ProxyPreserveHost ON ProxyVia Full KeepAlive On ProxyPassReverseCookieDomain mydomain.com Proxy balancer://proxy-balancer BalancerMemberhttp://xxx.xxx.xxx.xx1/rt_demo BalancerMemberhttp://xxx.xxx.xxx.xx2/rt_demo /Proxy ProxyPass /rt_demo balancer://proxy-balancer And on each RT instance we have the 'classic' setup: Alias /rt_demo /opt/rt3/share/html PerlModule Apache2::compat PerlModule Apache::DBI PerlRequire /opt/rt3/bin/webmux.pl AddOutputFilterByType DEFLATE application/x-javascript text/css text/html Location /rt/NoAuth Order allow,deny Allow from all Satisfy any /Location Location /rt/REST/1.0/NoAuth Order allow,deny Allow from all Satisfy any /Location Directory /opt/rt3/share/html AllowOverride All Options ExecCGI FollowSymLinks AddDefaultCharset UTF-8 SetHandler perl-script PerlHandler RT::Mason /Directory Thanks, Thierry
[rt-users] Load balancer and RT
Hello, For availability more than scalability, we would like to run two instances of RT (different hardware). Are there some issues to look for? Right now we have a simple Apache based load balancer but we are getting user session mix up. Any experience implementing such configuration? Thanks, Thierry
