Capistrano Deployment tool By Nagesh

What is Capistrano? Capistrano is an open source tool for running scripts on multiple servers;

Capistrano is an open source tool for running scripts on multiple servers;

Intro to Capistrano The main functionality of the Capistrano is to Deploy the rails application which you have already written. and we are using the "SVN" subversion to manage the code. Capistrano will transfer all the files of the rails application which you have developed in your local host to server directly by simply executing an simple command in your command prompt.

The main functionality of the Capistrano is to Deploy the rails application which you have already written. and we are using the "SVN" subversion to manage the code. Capistrano will transfer all the files of the rails application which you have developed in your local host to server directly by simply executing an simple command in your command prompt.

Hosting servers?

How Do I Install It? gem install capistrano

Installing Capistrano Cap –TV => Shows the all available options Create a rails application and capistranize your application using the following command capify . It will Creates two files: config/deploy.rb - capfile

Cap –TV => Shows the all available options

Create a rails application and capistranize your application using the following command

capify .

It will Creates two files:

config/deploy.rb

- capfile

deploy.rb set :application, “yourappname" set :repository, “your svn url" role :web, “your site address" role :app, " your site address " role :db, " your site address " set :deploy_to, “path to deploy" set :user, “username" set :svn_username, “svn username" set :svn_password, “svn password" desc "Restart the webserver/fcgi procs, however you do it" task :restart, :roles => :app do # I’m not going to restart anything for this example end task :after_deploy, :roles => :app do # Set my new dispatch.fcgi to be executable run "chmod 755 #{deploy_to}/current/public/dispatch.fcgi" end

set :application, “yourappname"

set :repository, “your svn url"

role :web, “your site address"

role :app, " your site address "

role :db, " your site address "

set :deploy_to, “path to deploy"

set :user, “username"

set :svn_username, “svn username"

set :svn_password, “svn password"

desc "Restart the webserver/fcgi procs, however you do it"

task :restart, :roles => :app do

# I’m not going to restart anything for this example

end

task :after_deploy, :roles => :app do

# Set my new dispatch.fcgi to be executable

run "chmod 755 #{deploy_to}/current/public/dispatch.fcgi"

end

Roles Named subsets of servers

Roles Named subsets of servers

Multiple applications on your host

Multiple applications on your host

Need a Deploy Target? Run once to create the deploy directories cap setup it will create the directory structure in server

cap setup

it will create the directory structure in server

First Time Deploy? Checks out the latest revision; makes it the current cap update_code symlink lighttpd -f /path/to/current/lighttpd.conf

cap update_code symlink

lighttpd -f /path/to/current/lighttpd.conf

New Release Ready? Updates code on all servers; restarts FCGI processes cap deploy

cap deploy

Deployed a Lemon? Goes back to last revision; restarts FCGI processes cap rollback

cap rollback

Need Some Downtime? Disables web access; puts up maintenance page cap disable_web cap enable_web

cap disable_web

cap enable_web

What’s the Current Revision? Tasks can access all configuration variables $ cap current_revision

Chaining Tasks $ cap status

$ cap status

Multiple Configurations $ cap -S where=production deploy

$ cap -S where=production deploy

Important commands 1) cap deploy:setup This command creates the appropriate directory structure for Capistrano on the deployment server based upon values set in your deploy.rb 2) cap deploy:check If everything is successful, you should see a message that reads something like… You appear to have all necessary dependencies installed 3) cap deploy:update push your code out to the server 4) cap deploy:start to start up your application

1) cap deploy:setup This command creates the appropriate directory structure for Capistrano on the deployment server based upon values set in your deploy.rb 2) cap deploy:check If everything is successful, you should see a message that reads something like… You appear to have all necessary dependencies installed

3) cap deploy:update push your code out to the server 4) cap deploy:start to start up your application

Capistrano Just Assumes... Same deploy directory structure and password on each machine Web app uses FastCGI with Apache or LightTPD As the number of machines and processes in your environment increases... you’re still typing exactly one command.

Same deploy directory structure and password on each machine

Web app uses FastCGI with Apache or LightTPD

As the number of machines and processes in your environment increases... you’re still typing exactly one command.

QUERIES?

QUERIES?

With Git? default_run_options[:pty] = true set :repository, "git@github.com:vanpelt/rails-app.git" set :scm, "git" set :scm_passphrase, "p@ssw0rd" set :user, "deployer"

default_run_options[:pty] = true

set :repository, "git@github.com:vanpelt/rails-app.git"

set :scm, "git"

set :scm_passphrase, "p@ssw0rd"

set :user, "deployer"

Thank You

Thank You