Why is the Rails app under Passenger occasionally grinding to a halt

apache-2.2phusion-passengerruby-on-rails

I have a Rails 2.3.2 app running on Apache with Passenger, and recently, the strangest thing has started happening.

Every so often, the app will just stop processing requests entirely and they'll all back up until they time out. Restarting Apache seems to be the only way out. The system is under relatively light load until this happens, at which point it's under no load at all.

I realize this isn't a lot to go on, but how can I even figure out what's causing this? Of note, global queuing is turned on; Ruby is ruby-enterprise-1.8.6-20080610; and Passenger is the version that came with the aforementioned Ruby Enterprise Edition.

Best Answer

One resource that I found useful was the section of the Passenger users guide where they talk about this:

If one of your application instances is frozen (stopped responding), then you can figure out where it is frozen by killing it with SIGABRT. This will cause the application to raise an exception, with a backtrace.

Related Solutions

Passenger “Missing the Rails 2.3.4 gem” after Apache restart

I solved this a while ago by restarting apache with the command /etc/init.d/httpd restart rather than service httpd restart. Not sure why that worked, but it did. None of the environment.rb changes did anything.

I Can’t Get Ruby on Rails + Passenger + Apache to Work

If mod_rails is properly installed & loaded, the only configuration you need in apache is to point the document root to the public folder. mod_rails is smart enough to realize where the rest comes from. in apache: the <Directory> statement refers to the physical file location rather than the perceived path. This should also be your public folder for your rails app.

i.e.

<Directory /var/www/syyborg.com/ruby/blog/public>
     Options FollowSymLinks
     AllowOverride None
     Order Allow,Deny
     Allow from All
</Directory>

and your RailsBaseURI should be the path you're looking to use.

i.e.

RailsBaseURI "/rails"

Your alias statement looks fine.

Best Answer

Related Solutions

Passenger “Missing the Rails 2.3.4 gem” after Apache restart

I Can’t Get Ruby on Rails + Passenger + Apache to Work

Related Topic