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Rails Hosting and Deployment. Action Items. Choosing a Linux variety for your server Selecting a hosting solution for your server Building your server Installing and configuring your web server Clustering and load balancing your application servers Monitoring your application server

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Presentation Transcript
slide2
Action Items
  • Choosing a Linux variety for your server
  • Selecting a hosting solution for your server
  • Building your server
  • Installing and configuring your web server
  • Clustering and load balancing your application servers
  • Monitoring your application server
  • Automating deployment
  • Deploy!
slide3
Linux Varieties
  • Choosing a Linux variety with a great community support around Ruby and Rails is important
  • Debian based and Red Hat Linux are of some the most common choices amongst the Rails community
  • Debian based and Red Hat Linux have excellent package managers that ease server setup without having to compile necessary libraries from source
  • Forums are abundant with information and troubleshooting advice
  • Other Linux varieties include CentOS, Gentoo, SUSE, Mandrake
  • All working examples will be with Ubuntu
slide4
Hosting Solutions
  • Virtualized server solutions are a very attractive and cost effective way to host your Rails app
    • Check out Slicehost and EngineYard
  • Amazon Elastic Cloud Computing (EC2) as an option has the best scalability for firing up additional server instances as needed in an affordable way
    • Ubuntu has an excellent forum focused on EC2 setup
    • Wide variety of Linux distributions are available in AMI form (Amazon Machine Image)
  • Dedicated servers are still the most common and familiar way to go
slide5
Server Setup

Part 1 Ruby and Database(s)

sudo apt-get install build-essential

sudo apt-get install ruby rirdoc ruby1.8-dev irb1.8 libnet-daemon-perllibplrpc-perl libreadline-ruby1.8 libruby1.8 rdoc1.8 ri1.8 ruby1.8 irblibopenssl-ruby libopenssl-ruby1.8 psmisc

sudo apt-get install mysql-server libmysql-ruby libdbd-mysql-perllibdbi-perl libmysql-ruby1.8 libmysqlclient15off libmysqlclient-dev mysql-client-5.0 mysql-common mysql-server-5.0

sudo apt-get install libsqlite3-dev sqlite3 libsqlite3-ruby

sudo apt-get install openssllibssl-dev

slide6
Server Setup

Part 2 Gems

  • Unpack your gems into your application to ensure that none are forgotten, only those with C bindings need to be installed on the server
  • environment.rb should define those that are specific to application and throw an error if not available
  • rake -T

wget http://rubyforge.org/frs/download.php/56227/rubygems-1.3.3.tgz

sudoln -s /usr/bin/gem1.8 /usr/local/bin/gem

sudoln -s /usr/bin/ruby1.8 /usr/local/bin/ruby

sudoln -s /usr/bin/rdoc1.8 /usr/local/bin/rdoc

sudoln -s /usr/bin/ri1.8 /usr/local/bin/ri

sudoln -s /usr/bin/irb1.8 /usr/local/bin/irb

sudo gem install rails --no-rdoc --no-ri

sudo gem install mongrel --no-rdoc --no-ri

sudo gem install mongrel_cluster --no-rdoc --no-ri

sudo gem install mysql --no-rdoc --no-ri

sudo gem install sqlite3-ruby --no-rdoc --no-ri

slide7
Server Setup

Part 3 Web Server

  • Many options are available for web servers including
    • Apache
    • LightHttp
    • Nginx
  • We are going to setup Nginx which has become the preferred web server for Rails applications

sudo aptitude install libc6 libpcre3 libpcre3-dev libpcrecpp0 libssl0.9.8 libssl-dev zlib1g zlib1g-dev lsb-base

Build it from source

wgethttp://sysoev.ru/nginx/nginx-0.6.36.tar.gz

./configure --sbin-path=/usr/local/sbin --with-http_ssl_module

make

sudo make install

slide8
Server Setup

Part 4 SSH / SCP / SFTP enabled

We need to ensure SSH is enabled on the target deployment server(s)

sudo apt-getopenssh-server openssh-client

slide9
Web Server Configuration

sudo vi /etc/init.d/nginx

Article for creating the nginx start/stop script: http://articles.slicehost.com/2009/3/4/ubuntu-intrepid-adding-an-nginx-init-script

Try:

sudo /etc/init.d/nginx start

sudo /etc/init.d/nginx stop

sudo /etc/init.d/nginx restart

slide10
More Web Server Configuration
  • Debian like folder configuration with symlinks => sites-available and sites-enabled
  • Document root and GZIP’ing your static files
  • Re-write rules
  • SSL certificates
  • Load balancing your application servers with nginx upstream
slide11
Mongrel Clustering
  • Create a mongrel directory under your config folder
  • Each environment that your application deploys to should have a “mongrel cluster” YAML
  • Configure
  • mongrel_railscluster::configure
  • Start up
  • mongrel_railscluster::start -C /home/railsuser/demo/current/config/mongrel/production.yml
  • Shut down
  • mongrel_railscluster::stop -C /home/railsuser/demo/current/config/mongrel/production.yml
slide12
Mongrel Load Balancing with Nginx
  • Nginx provides a load balancing module called “upstream”
  • Works in a round robin distribution
  • Pros and cons
  • Offset with additional software called haproxy or load balancer hardware

upstream demo_cluster {

server 127.0.0.1:3000;

server 127.0.0.1:3001;

server 127.0.0.1:3002;

server 127.0.0.1:3003;

}

slide13
Monitoring your Application
  • monit is a very popular and configurable monitoring solution
  • sudo apt-get install monit
  • sudo vi /etc/monit/monitrc
  • God is alternative monitoring solution

monit example confiiguration:

check process app-mongrel-5200 with pidfile /home/railsuser/demo/shared/tmp/mongrel.3000.pid

start program = "/usr/bin/mongrel_railscluster::start -C /home/railsuser/demo/current/config/mongrel/production.yml --clean --only 3000" as uidrailsuser and gidrailsuser

stop program = "/usr/bin/mongrel_railscluster::stop -C /home/railsuser/demo/current/config/mongrel/production.yml --clean --only 3000" as uidrailsuser and gidrailsuser

if totalmem is greater than 100.0 MB for 2 cycles then restart

if failed port 5200 protocol http # check for response

with timeout 10 seconds

then restart

if cpu is greater than 80% for 3 cycles then restart

if cpu is greater than 50% for 2 cycles then alert

group app-mongrel

slide14
Deployment
  • Capistrano is still the most widely used Rails deployment framework
  • Vlad the Deployer is rising in usage and is very similar to Capistrano
  • For Jruby projects that need to bundled in a WAR, Warbler is an excellent tool
  • You can get creative with traditional tools like Ant, Maven, and Makefiles but not recommended
slide15
Capistrano Installation

Execute this on the server(s) your deploying from:

sudo gem install capistrano

Other gem dependencies include:

sudo gem install net-scp

sudo gem install net-ssh

sudo gem install net-ssh-gateway

sudo gem install net-sftp

Execute this at the root of your Rails stack:

capify

slide16
Capistrano Tasks

Default commands are usually enough for the simplest Rails

Applications

Need a new script called script/spin

Custom tasks need to be created for:

monit, various deployment environments (test, staging, etc)

cap deploy:setup

cap deploy:check

cap deploy:update

cap deploy:start, stop, restart

cap deploy

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