Apache

Apache does not support Websockets, see this post. Therefore you'll have to use Apache as a forward-proxy to thin. Your Apache will need the following modules enabled:

• mod_proxy
• mod_proxy_wstunnel

<VirtualHost *:80>
  ServerName YOUR.SERVER.NAME
  DocumentRoot /PATH/TO/APP_NAME/public

  ProxyRequests Off
  ProxyPreserveHost On

  # a2enmod proxy_wstunnel
  ProxyPass /socket  ws://localhost:3001/socket
  ProxyPassReverse /socket  ws://localhost:3001/socket
  ProxyPass / http://localhost:3001/
  ProxyPassReverse / http://localhost:3001/

  LogLevel warn

  CustomLog ${APACHE_LOG_DIR}/APP_NAME_access.log combined
  ErrorLog ${APACHE_LOG_DIR}/APP_NAME_error.log
</VirtualHost>

Install this as a service with thin install and add the following configuration file inside /var/thin/volt.yml

---
chdir: "/PATH/TO/APP_NAME"
environment: production
address: 0.0.0.0
port: 3001
timeout: 30
log: "/var/log/thin-expenses.log"
pid: tmp/pids/thin.pid
max_conns: 1024
max_persistent_conns: 100
require: []
wait: 30
threadpool_size: 20
servers: 1
daemonize: true

Start thin afterwards with sudo /etc/init.d/thin start