[Mongrel] Mongrel stops responding after period of inactivity

Piyush Ranjan piyush.pr at gmail.com
Tue Jul 31 02:57:57 EDT 2007


had there been a error, things would have been very easier then :P

On 7/30/07, Matt Zukowski <mzukowski at urbacon.net> wrote:
>
> Check two things:
>
> - Database connection might be getting closed by the DB server (we've
> had this exact problem with MySQL)
> - Logs might be getting rotated (although you'd probably get a different
> error if this were the case)
>
>
> Olly Lylo wrote:
> > Hi
> > I posted this to the Ruby on Rails Talk group but I thought I'd post it
> here
> > too as it's probably a more appropriate group.  Hope this is ok.
> >
> > I'm running a 2-instance Mongrel cluster behind Apache 2.2.4 with Rails
> > 1.2.3.  If no requests are received by the application for several hours
> > (this usually happens overnight) then Mongrel stops
> > responding and no requests are detected by Rails (at least nothing is in
> the
> > Rails log).  Nothing untoward is in the Mongrel log.
> >
> > If you try and visit the application, the request times out with a 502
> Proxy
> > Error.  Apache is still up and running and serving static files without
> a
> > problem, but the following is present in the Apache error log (from
> trying
> > to hit the SessionController, identified by / sessions) which may
> provide a
> > clue:
> >
> >     [Sun Jul 29 08:37:36 2007] [error] proxy: error reading status line
> from
> > remote server 127.0.0.1
> >     [Sun Jul 29 08:37:36 2007] [error] proxy: Error reading from remote
> > server returned by /sessions
> >
> > Restarting the Mongrel cluster resolves the problem until the next time
> it
> > happens.  I have done a lot of reading about this issue online and a
> number
> > of sources -- including the Mongrel FAQ -- point to being able to fix a
> > 'hanging mongrel' situation by setting this value in environment.rb:
> >
> >     ActiveRecord::Base.verification_timeout = 14400
> >
> > This make the ActiveRecord timeout value less than the MySQL default of
> > 28800.  I have made this change and it doesn't appear to make a
> difference.
> >
> > Can anyone advise me on what to try next to diagnose this issue?
> >  I'm quickly running out of ideas and I'd appreciate a bit of help!
> >
> > Here are the vitals from our Ubuntu 6.0.6 server:
> >
> >     MySQL
> >         Ver 14.12 Distrib 5.0.22, for pc-linux-gnu (x86_64) using
> readline
> > 5.1
> >         connect_timeout                 5
> >         interactive_timeout             28800
> >         max_connect_errors           10
> >         max_connections               100
> >         max_user_connections       0
> >         wait_timeout                      28800
> >
> >     ruby 1.8.6 (2007-03-13 patchlevel 0) [x86_64-linux]
> >         cgi_multipart_eof_fix (2.2)
> >         fastthread (1.0)
> >         mongrel (1.0.1)
> >         mongrel_cluster (1.0.2)
> >
> >     Apache/2.2.4 (Unix)
> >
> >     Mongrel Cluster Config:
> >         port: "8000"
> >         environment: production
> >         address: 127.0.0.1
> >         pid_file: log/mongrel.pid
> >         servers: 2
> >         user: [the user]
> >         group: [the group]
> >
> >     Apache Load Balancer setup:
> >         <Proxy balancer://appname_cluster>
> >         BalancerMember http://127.0.0.1:8000
> >         BalancerMember http://127.0.0.1:8001
> >         </Proxy>
> >
> >     Apache Loaded Modules:
> >         core_module (static)
> >         authn_file_module (static)
> >         authn_default_module (static)
> >         authz_host_module (static)
> >         authz_groupfile_module (static)
> >         authz_user_module (static)
> >         authz_default_module (static)
> >         auth_basic_module (static)
> >         cache_module (static)
> >         include_module (static)
> >         filter_module (static)
> >         deflate_module (static)
> >         log_config_module (static)
> >         env_module (static)
> >         headers_module (static)
> >         setenvif_module (static)
> >         proxy_module (static)
> >         proxy_connect_module (static)
> >         proxy_ftp_module (static)
> >         proxy_http_module (static)
> >         proxy_ajp_module (static)
> >         proxy_balancer_module (static)
> >         ssl_module (static)
> >         mpm_prefork_module (static)
> >         http_module (static)
> >         mime_module (static)
> >         status_module (static)
> >         autoindex_module (static)
> >         asis_module (static)
> >         cgi_module (static)
> >         negotiation_module (static)
> >         dir_module (static)
> >         actions_module (static)
> >         userdir_module (static)
> >         alias_module (static)
> >         rewrite_module (static)
> >         so_module (static)
> >         php5_module (shared)
> >         info_module (shared)
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
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> > Mongrel-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/mongrel-users
>
>
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