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        <h1>Deploying Rails</h1><p>Your &quot;Minimal Viable Product&quot; is finished, now you
want to publish it on the web.</p><p>After working through this guide you should be able to</p>
<ul>
<li>deploy a rails app to dokku (or heroku) using git</li>
<li>deploy a rails app to any unix server using capistrano</li>
</ul>

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              Chapters
            </h3>
            <ol class="chapters">
<li><a href="#deploying-with-git">Deploying with git</a></li>
<li><a href="#public-key-authentication-in-ssh">Public Key Authentication in SSH</a>

<ul>
<li><a href="#deploying-with-a-deploy-user">deploying with a deploy-user</a></li>
<li><a href="#authorized-keys2">authorized_keys2</a></li>
</ul></li>
<li><a href="#how-to-run-rails">How to run Rails</a>

<ul>
<li><a href="#webrick">WEBrick</a></li>
<li><a href="#mod-passenger">mod_passenger</a></li>
</ul></li>
<li><a href="#deploying-with-capistrano">Deploying with Capistrano</a>

<ul>
<li><a href="#warning">WARNING</a></li>
<li><a href="#capistrano-assumptions">capistrano assumptions</a></li>
<li><a href="#how-to-install">how to install</a></li>
<li><a href="#configuration-in-config-deploy-rb">configuration in <code>config/deploy.rb</code></a></li>
<li><a href="#example-task-in-capfile">example task in Capfile</a></li>
<li><a href="#prepare-capistranoe">prepare capistranoe</a></li>
<li><a href="#run-a-capistrano-task">run a capistrano task</a></li>
<li><a href="#capistrano-folders">capistrano folders</a></li>
<li><a href="#my-first-deploy">my first deploy</a></li>
</ul></li>
</ol>

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<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-0' href='slides_deploying_rails.html#/0'>◻</a></p>
<h2 id="deploying-with-git"><a class="anchorlink" href="#deploying-with-git"><span>1</span> Deploying with git</a></h2><p>heroku is one "Platform as a Service" provider that offers
to host your rails app.  Heroku uses git to push the code to
the production server.</p><p>(See also
<a href="http://railsbridge.projects.multimediatechnology.at/installfest/create_a_heroku_account">Railsbridge Installfest: Create A Heroku Account</a>
and
<a href="https://railsbridge.projects.multimediatechnology.at/installfest/deploy_a_rails_app">Railsbridge Installfest: Deploy A Rails App</a>
)</p>
<ul>
<li>create an account on <a href="https://heroku.com">https://heroku.com</a></li>
<li>add your public key to your heroku account</li>
<li>install the heroku toolbelt on your local development machine</li>
</ul>
<p>in your rails app, which is already using git:</p>
<ul>
<li>heroku create</li>
<li>make some changes in the Gemfile (rubyracer, pg instead of sqlite)</li>
<li>don't forget to commit all changes!</li>
<li>git push heroku master</li>
<li>heroku run rake db:migrate</li>
<li>heroku open</li>
<li>heroku logs</li>
</ul>
<p>That's it.   You should now have an app with a very strange URL, like
<a href="http://mighty-shore-1497.herokuapp.com/">http://mighty-shore-1497.herokuapp.com/</a></p></div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-1' href='slides_deploying_rails.html#/1'>◻</a></p>
<h2 id="public-key-authentication-in-ssh"><a class="anchorlink" href="#public-key-authentication-in-ssh"><span>2</span> Public Key Authentication in SSH</a></h2><p>(See also <a href="http://railsbridge.projects.multimediatechnology.at/installfest/create_an_ssh_key">Railsbridge Installfest</a>)</p><p><img src="images/public_key_crypto.svg" alt="public key login"></p>
<ul>
<li><a href="https://dougvitale.wordpress.com/2012/02/20/ssh-the-secure-shell/">learn about ssh</a></li>
<li>if you have a public + private key pair

<ul>
<li><code>id_rsa</code></li>
<li><code>id_rsa.pub</code></li>
</ul></li>
<li>and your private key is on your local computer

<ul>
<li>stored in <code>~/.ssh/id_rsa</code></li>
</ul></li>
<li>and your public key is on the server

<ul>
<li>stored in <code>~/.ssh/authorized_keys2</code></li>
</ul></li>
<li>then ssh will let you log in without giving a password</li>
</ul>
<p><img src="images/ssh_login_with_public_key.svg" alt="public key login"></p></div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-2' href='slides_deploying_rails.html#/2'>◻</a></p>
<h3 id="deploying-with-a-deploy-user"><a class="anchorlink" href="#deploying-with-a-deploy-user"><span>2.1</span> deploying with a deploy-user</a></h3>
<ul>
<li>alice and bob both want to deploy project x</li>
<li><code>deploy_x</code> is set up as an account on the server</li>
<li>alice adds her public key to <code>~deploy_x/.ssh/authorized_keys2</code></li>
<li>bob adds his public key to <code>~deploy_x/.ssh/authorized_keys2</code></li>
<li>both can deploy (from different machines) using the same capistrano setup</li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-3' href='slides_deploying_rails.html#/3'>◻</a></p>
<h3 id="authorized-keys2"><a class="anchorlink" href="#authorized-keys2"><span>2.2</span> authorized_keys2</a></h3><div class="interstitial code">
<pre><code class="highlight plaintext">ssh-rsa AAAAB3NzaC...2EAAAABI== alice@fh-salzburg.ac.at
ssh-rsa AAAAB8NzaC...DVj3R4Ww== bob@fh-salzburg.ac.at
</code></pre>
<button class="clipboard-button" data-clipboard-text="ssh-rsa AAAAB3NzaC...2EAAAABI== alice@fh-salzburg.ac.at
ssh-rsa AAAAB8NzaC...DVj3R4Ww== bob@fh-salzburg.ac.at
">Copy</button>
</div>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-4' href='slides_deploying_rails.html#/4'>◻</a></p>
<h2 id="how-to-run-rails"><a class="anchorlink" href="#how-to-run-rails"><span>3</span> How to run Rails</a></h2>
<ul>
<li>WEBrick (built in web server)</li>
<li>apache/nginx + mod_passenger</li>
<li>apache/nginx + mod_passenger + capistrano</li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-5' href='slides_deploying_rails.html#/5'>◻</a></p>
<h3 id="webrick"><a class="anchorlink" href="#webrick"><span>3.1</span> WEBrick</a></h3>
<ul>
<li>rails s</li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-6' href='slides_deploying_rails.html#/6'>◻</a></p>
<h3 id="mod-passenger"><a class="anchorlink" href="#mod-passenger"><span>3.2</span> mod_passenger</a></h3>
<ul>
<li>install <a href="https://www.phusionpassenger.com/">mod_passenger</a></li>
<li>upload your code</li>
<li>create files not in git (e.g. database.yml)</li>
<li>apache config:

<ul>
<li>set <code>DocumentRoot</code> to <code>public/</code></li>
<li>set <code>RailsEnv production</code></li>
</ul></li>
<li>restart apache</li>
<li>if you change the code:

<ul>
<li>touch <code>tmp/restart.txt</code> to force reload of code</li>
</ul></li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-7' href='slides_deploying_rails.html#/7'>◻</a></p>
<h2 id="deploying-with-capistrano"><a class="anchorlink" href="#deploying-with-capistrano"><span>4</span> Deploying with Capistrano</a></h2><p><img src="images/capistrano-deploy.svg" alt="Deploying with Javascript"></p></div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-8' href='slides_deploying_rails.html#/8'>◻</a></p>
<h3 id="warning"><a class="anchorlink" href="#warning"><span>4.1</span> WARNING</a></h3>
<ul>
<li>capistrano is a command line tool</li>
<li>you need to read the output!</li>
<li>you need to read every line of the output!</li>
<li>you seriously need to read every line of the output!</li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-9' href='slides_deploying_rails.html#/9'>◻</a></p>
<h3 id="capistrano-assumptions"><a class="anchorlink" href="#capistrano-assumptions"><span>4.2</span> capistrano assumptions</a></h3>
<ul>
<li>You are using SSH to access your remote machines</li>
<li>your remote servers have a shell called sh</li>
<li>authentication through password or public key</li>
<li>Capistrano reads its instructions from a <code>capfile</code></li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-10' href='slides_deploying_rails.html#/10'>◻</a></p>
<h3 id="how-to-install"><a class="anchorlink" href="#how-to-install"><span>4.3</span> how to install</a></h3><div class="interstitial code">
<pre><code class="highlight sh"><span class="nv">$ </span><span class="nb">sudo gem install </span>capistrano
Fetching: capistrano-2.13.5.gem <span class="o">(</span>100%<span class="o">)</span>
Successfully installed capistrano-2.13.5
1 <span class="nb">gem </span>installed
<span class="nv">$ $ </span>cap <span class="nb">install
mkdir</span> <span class="nt">-p</span> config/deploy
create config/deploy.rb
create config/deploy/staging.rb
create config/deploy/production.rb
<span class="nb">mkdir</span> <span class="nt">-p</span> lib/capistrano/tasks
create Capfile
Capified
</code></pre>
<button class="clipboard-button" data-clipboard-text="$ sudo gem install capistrano
Fetching: capistrano-2.13.5.gem (100%)
Successfully installed capistrano-2.13.5
1 gem installed
$ $ cap install
mkdir -p config/deploy
create config/deploy.rb
create config/deploy/staging.rb
create config/deploy/production.rb
mkdir -p lib/capistrano/tasks
create Capfile
Capified
">Copy</button>
</div>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-11' href='slides_deploying_rails.html#/11'>◻</a></p>
<h3 id="configuration-in-config-deploy-rb"><a class="anchorlink" href="#configuration-in-config-deploy-rb"><span>4.4</span> configuration in <code>config/deploy.rb</code></a></h3><p>local information, see our wiki</p></div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-12' href='slides_deploying_rails.html#/12'>◻</a></p>
<h3 id="example-task-in-capfile"><a class="anchorlink" href="#example-task-in-capfile"><span>4.5</span> example task in Capfile</a></h3><div class="interstitial code">
<pre><code class="highlight ruby"><span class="n">task</span> <span class="ss">:display_free_disk_space</span> <span class="k">do</span>
  <span class="n">run</span> <span class="s2">"df -h"</span>
<span class="k">end</span>
</code></pre>
<button class="clipboard-button" data-clipboard-text="task :display_free_disk_space do
  run &quot;df -h&quot;
end
">Copy</button>
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<h3 id="prepare-capistranoe"><a class="anchorlink" href="#prepare-capistranoe"><span>4.6</span> prepare capistranoe</a></h3><div class="interstitial code">
<pre><code class="highlight sh"><span class="nv">$ </span>cap production <span class="nb">git</span>:check
<span class="nv">$ </span>scp config/database.yml deployuser@server:/var/www/.../shared/config
<span class="nv">$ </span>scp config/secrets.yml deployuser@server:/var/www/.../shared/config
<span class="nv">$ </span>cap production deploy
</code></pre>
<button class="clipboard-button" data-clipboard-text="$ cap production git:check
$ scp config/database.yml deployuser@server:/var/www/.../shared/config
$ scp config/secrets.yml deployuser@server:/var/www/.../shared/config
$ cap production deploy
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<h3 id="run-a-capistrano-task"><a class="anchorlink" href="#run-a-capistrano-task"><span>4.7</span> run a capistrano task</a></h3><div class="interstitial code">
<pre><code class="highlight sh"><span class="nv">$ </span>cap production deploy
<span class="nv">$ </span>cap display_free_disk_space
<span class="k">*</span> 2012-11-29 05:34:45 executing <span class="s1">'display_free_disk_space'</span>
<span class="k">*</span> executing <span class="s2">"df -h"</span>
  servers: <span class="o">[</span><span class="s2">"multimediaart.at"</span><span class="o">]</span>
  Password: <span class="k">****</span>
  <span class="o">[</span>multimediaart.at] executing <span class="nb">command</span>
<span class="k">**</span> <span class="o">[</span>out :: multimediaart.at] Size  Used Avail Use% Mounted on
<span class="k">**</span> <span class="o">[</span>out :: multimediaart.at] 98G   70G   24G  75% /var/www
  <span class="nb">command </span>finished <span class="k">in </span>165ms
</code></pre>
<button class="clipboard-button" data-clipboard-text="$ cap production deploy
$ cap display_free_disk_space
* 2012-11-29 05:34:45 executing 'display_free_disk_space'
* executing &quot;df -h&quot;
  servers: [&quot;multimediaart.at&quot;]
  Password: ****
  [multimediaart.at] executing command
** [out :: multimediaart.at] Size  Used Avail Use% Mounted on
** [out :: multimediaart.at] 98G   70G   24G  75% /var/www
  command finished in 165ms
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<h3 id="capistrano-folders"><a class="anchorlink" href="#capistrano-folders"><span>4.8</span> capistrano folders</a></h3><p>read the logfile, try to find out how capistrano lays out
the folders</p>
<ul>
<li>current --&gt; links to a release</li>
<li>release

<ul>
<li>20121201113038</li>
<li>20121201150544</li>
</ul></li>
<li>shared

<ul>
<li>assets</li>
<li>bundle</li>
<li>log</li>
<li>pids</li>
<li>system</li>
</ul></li>
</ul>
</div>
<div class='slide'>
<p class='slide_break_block'><a class='slide_break' id='slide-16' href='slides_deploying_rails.html#/16'>◻</a></p>
<h3 id="my-first-deploy"><a class="anchorlink" href="#my-first-deploy"><span>4.9</span> my first deploy</a></h3><div class="interstitial code">
<pre><code class="highlight sh"><span class="nv">$ </span>cap deploy:setup
<span class="nv">$ </span>cap deploy:check
<span class="nv">$ </span>cap deploy:cold
<span class="nv">$ </span>cap deploy:upload <span class="nv">FILES</span><span class="o">=</span><span class="s1">'config/database.yml'</span>
</code></pre>
<button class="clipboard-button" data-clipboard-text="$ cap deploy:setup
$ cap deploy:check
$ cap deploy:cold
$ cap deploy:upload FILES='config/database.yml'
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