Mongrel Cluster Plugin
Tool to help start/stop/restart multiple mongrel servers to use behind a load balancer like Apache 2.2 (mod_proxy_balancer), Lighttpd, Pound, Pen or Balance. This plugin adds an option to specify a number of Mongrel servers to launch, a range of ports, and a configuration file for the cluster. Use “-h” to see command syntax.
Configure cluster and write configuration file: mongrel_rails cluster::configure
Start cluster: mongrel_rails cluster::start
Restart cluster: mongrel_rails cluster::restart
Stop cluster: mongrel_rails cluster::stop
Capistrano Recipe
Add to config/deploy.rb: require ‘mongrel_cluster/recipes’
Example usage: cap -a configure_mongrel_cluster
Variables mongrel_servers: Number of Mongrel servers to start. mongrel_port: Starting port to bind to. mongrel_address: Address to bind to. mongrel_environment: Rails environment to run as. mongrel_conf: Path to conf file. Defaults to /etc/mongrel_cluster/app_name.conf mongrel_user: User to run mongrels in cluster as. Unset by default mongrel_group: Group to run mongrels in cluster as. Unset by default.
Tasks (performed on :app role) configure_mongrel_cluster: Configure the cluster with variables. start_mongrel_cluster: Start Mongrel processes on the app server. stop_mongrel_cluster: Stop the Mongrel processes on the app server. restart_mongrel_cluster: Restart the Mongrel processes on the app server by starting and stopping mongrel_cluster. restart: Calls restart_mongrel_cluster to allow Mongrel to be used with the standard Capistrano deploy task. spinner: Calls start_mongrel_cluster to allow Mongrel to be used with the standard Capistrano cold_deploy task.
Supporting starting clusters on boot.
-
Create mongrel_cluster conf directory (/etc/mongrel_cluster).
-
Assign ownership to your capistrano user.
-
Copy the init.d script from this gem’s resouces directory /etc/init.d.
-
chmod +x /etc/init.d/mongrel_cluster
-
Add to init.d startup. On RHEL/CentOS use: /sbin/chkconfig –level 345 mongrel_cluster on