Deploying Rails Applications
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Deploying Rails Applications

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Covers the different options for scaling Rails applications, Nginx, a light weight HTTP server / reverse proxy, using Cron for periodic scheduled task, and Monit for monitoring rails applications.

Covers the different options for scaling Rails applications, Nginx, a light weight HTTP server / reverse proxy, using Cron for periodic scheduled task, and Monit for monitoring rails applications.

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Deploying Rails Applications Deploying Rails Applications Presentation Transcript

  • Deploying Rails Applications Vivek Prahlad
  • Agenda
      • Typical Rails deployment scenarios
      • Mongrel
      • Nginx vs. Apache vs. Lighttpd
      • Shared vs. Virtual vs. Dedicated hosting
      • Monitoring Rails Applications
  • Typical Rails Deployment Setup Web Server (Static Content)‏ Rails App (Mongrel)‏ Database (MySQL / PostgreSQL)‏
  • Lots of Static content? Web Server (Static Content)‏ Rails App (Mongrel)‏ Database )‏ (MySQL / PostgreSQL)‏ Load Balancer Cluster
  • Heavy database load? Web Server (Static Content)‏ Rails App (Mongrel)‏ Database (MySQL / PostgreSQL)‏ Cluster
  • Very dynamic application? Web Server (Static Content)‏ Rails App (Mongrel)‏ Database (MySQL / PostgreSQL)‏ Cluster
  • Installing the stack using Deprec
      • cd /path/to/railsapp
      • deprec --apply-to . --name projectname --domain www.projectname.com
      • # edit config/deploy.rb to add svn details
      • cap install_rails_stack
      • cap setup
      • cap deploy_with_migrations
      • cap restart_apache
  • Mongrel
  • Mongrel
      • Pure Ruby web server for Ruby applications
      • Supports Rails, Camping, Og + Nitro
      • Need a cluster due to Rails threadsafety issue
      • Significant footprint increase with Rails 1.2
        • Approximately 60MB / Mongrel / Mephisto instance
      • Dash B logging for detecting memory leaks
  •  
  • Nginx
      • Web server from Igor Sysoev: best used as a reverse proxy
      • Rapidly becoming preferred choice of Rails community
      • 10MB footprint with 10,000 concurrent connections
      • Load balancing
      • Weighted load balancing
      • Relatively straightforward configuration
  • Nginx vs. Apache
      • Apache: Relatively Larger footprint
      • Thread per request
      • Nginx: Low footprint
      • Non blocking IO
  • Issues with Lighttpd
      • Stability
      • Memory leaks
      • Non-trivial URL rewriting
  • Nginx: configuring mongrel
      • upstream mongrel {
      • server 127.0.0.1:10000;
      • server 127.0.0.1:10001;
      • }
      • proxy_pass http://mongrel;
  • Nginx: load balancing
      • upstream backend {
      • server backend1.example.com weight=5;
      • server backend2.example.com:8080;
      • server unix:/tmp/backend3;
      • }
  • Nginx: Caveats
      • Primary documentation in Russian
        • (Documentation is rapidly improving, though)‏
      • No X-sendfile support (useful for serving large files)‏
      • Virtual host support poor
  • Rails Hosting
      • Rails 1.2+ unsuitable for shared hosting
      • Most shared hosts have published / unpublished memory caps
        • Textdrive: 47 MB per process
      • Dedicated hosting expensive
        • Starts at ~ $70 per month (e.g. ServerPronto)‏
  • Virtual Private Server (VPS) Hosting
      • Fits in between Shared and Dedicated hosting
      • Nice performance / price ratio (starts @ $20 / month)‏
      • Can potentially exploit superior hardware
      • Alternatives:
        • Xen
        • Virtuzzo
      • Baked in kernel level virtualization support is coming
      • Caveat: Need to manage your own setup
  • Advantages of VPS hosting
      • Entire CPU available when other users are idle.
      • Disk I/O usually faster than dedicated box (due to RAID etc.)‏
      • Can take advantage of SANs if required.
      • Hosting company takes care of the VPS server
      • Fairly easy to scale VPS setup (just add more VMs)‏
  • Monitoring Rails applications
      • Monit (http://www.tideslash.com/monit)‏
      • Process monitoring tool
      • Can monitor:
        • HTTP server
        • Processes
        • Databases (MySQL and PostgreSQL)‏
  • Cron Jobs
      • Clear stale sessions
      • Database maintenance
      • Clear logs
      • Best practice: get Cron to call out to a script
      • Don't hardcode commands in the crontab
      • Makes it easy to test
  • Putting it all together
      • Can use Monit to create 'self healing' setup
      • PostgresQL
      • Nginx
      • Mongrel
      • Cron
      • http://nginx.net/
      • http://railsexpress.de/blog (performance tuning)‏
      • http://hostingfu.com (blog on hosting)‏
      • http://www.slideshare.net/Georgio_1999/how-to-scale-your-web-app/ (scaling Rails)‏
    Additional Information
  • Thank You http://blog.vivekprahlad.com/