Questions[mongrel-cluster](server)

I've defined the following config to proxy Apache traffic to Mongrel to run Redmine.

At this point all the php scripts are now downloaded by the browser instead of being parsed. Once I remove this config every thing goes back to normal.

Is there anything I might be missing or is there a miss configuration ? Unfortunately there are no errors in neither apache error_log nor in php_error.log.

#define mongrel cluster
<proxy balancer://mongrelcluster>
  BalancerMember http://127.0.0.1:81
</proxy>



#forward requests to mongrel cluster
<virtualhost *:80>
  ServerName domain.com
  ServerAlias  host.domain.com
  ServerAlias <server ip>  

  ProxyPreserveHost on
  ProxyPass / balancer://mongrelcluster/
  ProxyPassReverse / balancer://mongrelcluster/  
</virtualhost>

We are trying to deploy mongrel instances on a machine. What is the optimal number of mongrel instances for a server? Since an instance can handle concurrent connections, I do not see any benefit in starting more than 1 per core. Any more than that and the threads will just fight for CPU. Our predecessors have assigned 10 instances for 4 cores, but I think it will just cause CPU contention. Any definitive answers / opinions?

I have seen this question: How many mongrel instances?

But it is really not specific enough.

HI

I have an Email Marketing Rails application running on a CentOS QuadCore 16GB RAM server. But currently our webserver is taking too long to respond to requests on rush hours (Mongrel Cluster + Apache ). We monitoring it using ScoutApp ( www.scoutapp.com ).

Scout Alerts Maximum Time(3 sec) exceeded on 668 requests Maximum Time(3 sec) exceeded on 120 requests

I contracted another server Dual Xeon 4GB RAM .

What is the best setup for distributing this application between 2 servers? I'm thinking about using the SERVER-1 (16GB RAM) with Mysql and Exim and migrate the application to SERVER-2 (4GB RAM) and use it as the WEB SERVER (Mongrel cluster + Apache) only.

Can anyone suggest me a better setup , tips or ideas?

I am using a load balancer to server a cluster. I can't get it to function.

LoadModule authz_host_module    modules/mod_authz_host.so
LoadModule mime_module          modules/mod_mime.so
LoadModule dir_module           modules/mod_dir.so
LoadModule log_config_module    modules/mod_log_config.so
LoadModule alias_module         modules/mod_alias.so
LoadModule setenvif_module      modules/mod_setenvif.so
LoadModule proxy_module         modules/mod_proxy.so
LoadModule ssl_module           modules/mod_ssl.so
LoadModule headers_module       modules/mod_headers.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module    modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so

    RequestHeader set X_FORWARDED_PROTO 'https'
    ProxyPreserveHost on
    <Proxy balancer://redminecluster>
           BalancerMember http://127.0.0.1:3000
      #     BalancerMember http://127.0.0.1:3001
      #     BalancerMember http://127.0.0.1:3002
    </Proxy>
    ProxyPass / balancer://redminecluster
    ProxyPassReverse / balancer://redminecluster

The above code serves a mobile looking page with CSS styles broken, and internal server errors when navigating to pages. This works fine if I comment all the proxy lines above:

ProxyPass / http://127.0.0.1:3000/
ProxyPassReverse / http://127.0.0.1:3000/

Any ideas?

I am trying to get mongrel cluster working on my Ubuntu Server Karmic box in preparation to setup Capistrano. I've been trying to get the two to work all day and finally decided to completely remove Capistrano and see if I can just get Mongrel Cluster to work.

I ran this to install mongrel cluster:

gem install mongrel mongrel_cluster

Everything installed fine, when I change into my app's directory...

# mongrel_rails
-bash: mongrel_rails: command not found

I can run it from its install location:

# /var/lib/gems/1.8/bin/mongrel_rails               
Usage: mongrel_rails <command> [options]
Available commands are:
...

It lets me build the cluster configuration file fine, but when I run the clister:start command:

# /var/lib/gems/1.8/bin/mongrel_rails cluster::start                               
starting port 8000
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31: command not found: mongrel_rails start -d -e production -p 8000 -P tmp/pids/mongrel.8000.pid -l log/mongrel.8000.log

starting port 8001
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31: command not found: mongrel_rails start -d -e production -p 8001 -P tmp/pids/mongrel.8001.pid -l log/mongrel.8001.log

starting port 8002
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31: command not found: mongrel_rails start -d -e production -p 8002 -P tmp/pids/mongrel.8002.pid -l log/mongrel.8002.log

It seems it isnt calling it from the right directory after that command, what can I do to fix this? I tried setting the path previously when trying to set up Capistrano, but the path didnt stay set when Capistrano used ssh to run the commands.