###Step 1 安装foreman和unicorn
添加gem在Gemfile中
gem 'foreman'
gem 'unicorn'
###Step 2 添加配置文件
####For unicorn
配置文件路径 ./config/unicorn.rb
# Preloads application before forking worker processes
preload_app true
# Amount of unicorn workers to spin up
worker_processes 2
# Restarts workers that hang for that many seconds
timeout 10
####For foreman
配置文件路径 ./Procfile
web: bundle exec unicorn -p 3000 -c ./config/unicorn.rb
注： 在3000端口启动unicorn
