What are application and web servers. What and how to configure application server. Basic fundamental and how it works for me.

1. Application/Web
Server
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2. 1
Simple Rails Setup
 One Rails instance handles all requests Rails is
single-threaded: There is only one concurrent
request
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3. 2
Rails Setup
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4. 3
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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5. 4
Deployment Questions
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6. 5
Deployment Questions
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7. 6
SERVERS
Rails Application Server Proxy/Web Server
 FastCGI  Apache2
 Mongrel  Nginx
 mod_rails / Phussion  Lighttpd
Passenger
 HA-Proxy
 JRuby + Glassfish & Co.
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8. FastCGI 7
 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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9. FastCGI 8
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10. 9
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11. 10
Mongrel
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12. 11
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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13. 12
Mongrel
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14. 13
Mongrel
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15. 14
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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16. 15
Mod_rails a.k.a Phusion Passenger
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17. Mod_rails a.k.a Phusion 16
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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18. 17
Install Phusion Passenger
 Install Apache module
 Load and activate in Apache
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19. 18
Customized Phusion Passenger
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20. 19
Control Phusion Passenger
Restart after deployment:
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21. 20
Phusion Passenger
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22. 21
Phusion Passenger
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23. 22
Phusion Passenger
 Ready for production
 Makes setup easier – on the single machine level
 Multiple servers still require load balancer
 Suitable for mass-hosting
 upcoming standard way of deploying Rails
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24. 23
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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25. 24
Setups
Recommended
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26. 25
Small Site
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27. 26
Medium Site
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28. 27
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29. Heavy Static Files 28
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30. 29
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31. 30
Application Server Handler
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32. 31
RACK
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33. 32
Rack Handler
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34. 33
Rack Supports
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35. 34
What 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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36. Where our applications reside? 35
Login to VPS 214
Sudo su - deploy
cd /var/www/apps/
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37. 36
How to debug?
Host <domainname>
Checkout ip address serving it
APACHE CONF file (path to app)
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38. 37
DEPLOYMENT
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39. 38
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40. 39
We prefer
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41. 40
How to DEPLOY?
CAPISTRANO
CUSTOM TASKS
EASIEST AND TRUSTED WAY
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42. 41
CAPISTRANO Requirements
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43. 42
What does Capistrano do?
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44. 43
Capistrano Deployment Cycle
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45. 44
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