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The location of PID files has changed in recent versions of Rails. This can occasionally cause problems with mongrel_cluster when you try to deploy your application. During deployment you may see errors such as "Path to pid file not valid" or you may see an error creating a symbolic link to /var/www/apps/yourapp/shared/pids. In either case, we're going to fix it by installing the latest version of mongrel_cluster and updating your deploy.rb file to put mongrel pid files in /var/run/mongrel_cluster. On your server: <pre><code>sudo su - gem install mongrel_cluster cp /usr/lib/ruby/gems/1.8/gems/mongrel_cluster-1.0.2/resources/mongrel_cluster /etc/init.d/ chmod +x /etc/init.d/mongrel_cluster chkconfig --levels 235 mongrel_cluster on mkdir -p /var/run/mongrel_cluster chown deploy.deploy /var/run/mongrel_cluster</code></pre> Now on your local system add this line to config/deploy.rb: <pre><code>set :mongrel_pid_file, "/var/run/mongrel_cluster/#{application}.pid"</code></pre> And then run: <pre><code>svn commit -m "updated pid_file location" cap app:setup deploy</code></pre>

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