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One Rails instance handles all requests Rails is single-threaded: There is only one concurrent request

Simple Rails Setup

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Rails Setup

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Typical Rails Setup

A load-balancer distributes the incoming requests

Some load-balancers will deliver static requests themselves

Several Rails instances handle all requests

Number of concurrent requests equals number of Rails instances

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Deployment Questions

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Deployment Questions

SERVERS

Rails Application Server

FastCGI

Mongrel

mod_rails / Phussion Passenger

JRuby + Glassfish & Co.

Proxy/Web Server

Apache2

Nginx

Lighttpd

HA-Proxy

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FastCGI

Protocol to communicate with long-running CGI applications

Usage of either mod_fcgi with Apache 1.3 or mod_fcgi with Lighttpd

Proxy local and remote FastCGI instances

Oldest way of deploying Rails

Deprecated and unstable

Hard to debug (FastCGI protocol)

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9FastCGI

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Mongrel

Mongrel

Developed by Zed Shaw as an alternative to FastCGI

Complete HTTP-Server that can load arbitrary Ruby-servlets

Built-in Rails support

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13Mongrel

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Mongrel

Very robust

Strict HTTP parser

Easy to debug (HTTP!)

Used to be defacto deployment setup with Apache 2.2 and mod_proxy_balancer

Can be a bit difficult to setup (mongrel_cluster, ports, Apache)

Not so easy on mass/virtual hosting

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Mod_rails a.k.a Phusion Passenger

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Mod_rails a.k.a Phusion Passenger

Module for Apache 2.2 (and Nginx)

Allows Apache to control Rails instances

Apache starts and stops application instances depending on the application load

Able to run any Rack-compatible Ruby application (Merb, Sinatra & Co.)

Only manages Rails on one host - no remote instances

Combine with HTTP-Proxy / balancing solution

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Install Phusion Passenger Install Apache module

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Load and activate in Apache

Customized Phusion Passenger

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Control Phusion Passenger

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Restart after deployment:

Phusion Passenger

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Phusion Passenger

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Phusion Passenger

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Apache 2.2

Apache 2.2 introduced mod_proxy_balancer

mod_proxy_balancer can speak to multiple backends and balance requests

Apache can acts as a pure proxy or can also serve static files

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Reco

mm

ended

Setu

ps

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Small Site

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Medium Site

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29Heavy Static Files

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31Application Server Handler

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32RACK

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33Rack Handler

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34Rack Supports

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35What are we using?

Speedy Rails (vps213 and vps214) (Canada)

Apache2

Ruby Enterprise(1.8)

Phusion Passenger

MySql

Build, Staging and Production Environments

Every RAILS APP log maintained

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Where our applications reside?

cd /var/www/apps/

Login to VPS 214

Sudo su - deploy

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APACHE CONF file (path to app)

Host <domainname>

Checkout ip address serving it

DEPLOYMENT

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We prefer

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41How to DEPLOY?

EASIEST AND TRUSTED WAY

CAPISTRANO

CUSTOM TASKS

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42CAPISTRANO Requirements

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43What does Capistrano do?

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44Capistrano Deployment Cycle

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