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Installing Rails, mongrel and mongrel_cluster on Debian

Tagged ruby, rails, mongrel, debian, install, sqlite3, mongrel_cluster  Languages bash


Install RubyGems


tar zxvf rubygems-1.0.1.tgz

cd rubygems-1.0.1

ruby setup.rb

Install Rails

gem install rails

Install sqlite3 (optional)

apt-get install sqlite3 libsqlite3-dev
gem install sqlite3-ruby

Install mongrel and mongrel_cluster

$ gem install mongrel mongrel_cluster

$ mongrel_rails cluster::configure -e production \
  -p 8000 \
  -a \
  -N 3 \
  -c /var/www/xyz/current

$ mongrel_rails cluster::start

$ useradd -g www-data -d /var/www mongrel

Surviving reboots

sudo mkdir /etc/mongrel_cluster

sudo ln -s /var/www/xyz/config/mongrel_cluster.yml /etc/mongrel_cluster/xyz.yml

sudo cp /usr/local/lib/ruby/gems/1.8/gems/mongrel_cluster-1.0.5/resources/mongrel_cluster /etc/init.d/

sudo chmod +x /etc/init.d/mongrel_cluster

sudo /usr/sbin/update-rc.d -f mongrel_cluster defaults

mongrel_cluster_ctl status

Stale pids

If your mongrels crash or if you kill them, mongrel_cluster won't start your mongrels because mongrel_cluster believes the processes are still running, instead mongrel_cluster complains and does nothing:

** !!! PID file tmp/pids/mongrel.8000.pid already exists.  Mongrel could be running already.  Check your log/mongrel.8000.log for errors.
** !!! Exiting with error.  You must stop mongrel and clear the .pid before I'll attempt a start.

To fix this simply add the --clean switch to the /usr/local/lib/ruby/gems/1.8/gems/mongrel_cluster-1.0.5/resources/mongrel_cluster startup script:

mongrel_cluster_ctl start -c $CONF_DIR --clean