How to precompile assets with Chef?

Question

OpsWorks isn\'t precompiling assets on deploy. I found this recipe in this thread but I think it\'s not complete though, or missing something because I get an error about

Answer 1

Before OpsWorks supports the Asset Pipeline out of the box, you could do this. Create a file deploy/before_symlink.rb with the following content in your rails application.

run "cd #{release_path} && RAILS_ENV=production bundle exec rake assets:precompile"

If you deploy your Rails application to a different environment, change the RAILS_ENV.

If you use a NGINX/Unicorn stack, you have to modify the /assets resource. Just copy the following content in a file named unicorn/templates/default/nginx_unicorn_web_app.erb in your cookbooks.

upstream unicorn_<%= @application[:domains].first %> {
 server unix:<%= @application[:deploy_to]%>/shared/sockets/unicorn.sock fail_timeout=0;
}

server {
  listen 80;
  server_name <%= @application[:domains].join(" ") %> <%= node[:hostname] %>;
  access_log <%= node[:nginx][:log_dir] %>/<%= @application[:domains].first %>.access.log;

  keepalive_timeout 5;

  root <%= @application[:absolute_document_root] %>;

  <% if @application[:nginx] && @application[:nginx][:client_max_body_size] %>
    client_max_body_size <%= @application[:nginx][:client_max_body_size] %>;
  <% end %>

  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    # If you don't find the filename in the static files
    # Then request it from the unicorn server
    if (!-f $request_filename) {
      proxy_pass http://unicorn_<%= @application[:domains].first %>;
      break;
    }
  }

  location /nginx_status {
    stub_status on;
    access_log off;
    allow 127.0.0.1;
    deny all;
  }

  location ~ ^/assets/ {
    expires 1y;
    add_header Cache-Control public;

    add_header ETag "";
    break;
  }

  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root <%= @application[:absolute_document_root] %>;
  }
}

<% if @application[:ssl_support] %>
server {
  listen   443;
  server_name <%= @application[:domains].join(" ") %> <%= node[:hostname] %>;
  access_log <%= node[:nginx][:log_dir] %>/<%= @application[:domains].first %>-ssl.access.log;

  ssl on;
  ssl_certificate /etc/nginx/ssl/<%= @application[:domains].first %>.crt;
  ssl_certificate_key /etc/nginx/ssl/<%= @application[:domains].first %>.key;
  <% if @application[:ssl_certificate_ca] -%>
  ssl_client_certificate /etc/nginx/ssl/<%= @application[:domains].first %>.ca;
  <% end -%>

  keepalive_timeout 5;

  root <%= @application[:absolute_document_root] %>;

  <% if @application[:nginx] && @application[:nginx][:client_max_body_size] %>
    client_max_body_size <%= @application[:nginx][:client_max_body_size] %>;
  <% end %>

  location / {
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    # If you don't find the filename in the static files
    # Then request it from the unicorn server
    if (!-f $request_filename) {
      proxy_pass http://unicorn_<%= @application[:domains].first %>;
      break;
    }
  }

  location ~ ^/assets/ {
    expires 1y;
    add_header Cache-Control public;

    add_header ETag "";
    break;
  }

  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root <%= @application[:absolute_document_root] %>;
  }
}
<% end %>

If you use a Apache2/Passenger stack, you have to modify the /assets resource. Just copy the following content in a file named passenger_apache2/templates/default/web_app.conf.erb in your cookbooks.

  ServerName <%= @params[:server_name] %>
  <% if @params[:server_aliases] && !@params[:server_aliases].empty? -%>
  ServerAlias <% @params[:server_aliases].each do |a| %><%= "#{a}" %> <% end %>
  <% end -%>

  <% if @params[:mounted_at] -%>
  DocumentRoot /var/www
  <%= @params[:deploy][:passenger_handler] -%>BaseURI <%= @params[:mounted_at] %>
  <% else -%>
  DocumentRoot <%= @params[:docroot] %>
  <%= @params[:deploy][:passenger_handler] -%>BaseURI /
  <% end -%>
  <%= @params[:deploy][:passenger_handler] -%>Env <%= @params[:rails_env] %>

  >
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
  

  
    Order allow,deny
    Deny from all
  

  
    Order allow,deny
    Deny from all
  

  
    Header unset ETag
    FileETag None
    # RFC says only cache for 1 year
    ExpiresActive On
    ExpiresDefault "access plus 1 year"
  

  LogLevel info
  ErrorLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-error.log
  CustomLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-access.log combined
  CustomLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-ganglia.log ganglia

  FileETag none

  RewriteEngine On
  Include <%= @params[:rewrite_config] %>*
  RewriteLog <%= node[:apache][:log_dir] %>/<%= @application_name %>-rewrite.log
  RewriteLogLevel 0

  # Canonical host
  #RewriteCond %{HTTP_HOST}   !^<%= @params[:server_name] %> [NC]
  #RewriteCond %{HTTP_HOST}   !^$
  #RewriteRule ^/(.*)$        http://<%= @params[:server_name] %>/$1 [L,R=301]

  RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|jpeg|png)$
  RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
  RewriteCond %{SCRIPT_FILENAME} !maintenance.html
  RewriteRule ^.*$ /system/maintenance.html [L]

  Include <%= @params[:local_config] %>*


<% if node[:deploy][@application_name][:ssl_support] -%>

  ServerName <%= @params[:server_name] %>
  <% if @params[:server_aliases] && !@params[:server_aliases].empty? -%>
  ServerAlias <% @params[:server_aliases].each do |a| %><%= "#{a}" %> <% end %>
  <% end -%>

  SSLEngine on
  SSLProxyEngine on
  SSLCertificateFile <%= node[:apache][:dir] %>/ssl/<%= @params[:server_name] %>.crt
  SSLCertificateKeyFile <%= node[:apache][:dir] %>/ssl/<%= @params[:server_name] %>.key
  <% if @params[:ssl_certificate_ca] -%>
  SSLCACertificateFile <%= node[:apache][:dir] %>/ssl/<%= @params[:server_name] %>.ca
  <% end -%>
  SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0

  <% if @params[:mounted_at] -%>
  DocumentRoot /var/www
  <%= @params[:deploy][:passenger_handler] -%>BaseURI <%= @params[:mounted_at] %>
  <% else -%>
  DocumentRoot <%= @params[:docroot] %>
  <%= @params[:deploy][:passenger_handler] -%>BaseURI /
  <% end -%>
  <%= @params[:deploy][:passenger_handler] -%>Env <%= @params[:rails_env] %>

  >
    Options FollowSymLinks
    AllowOverride All
    Order allow,deny
    Allow from all
  

  
    Order allow,deny
    Deny from all
  

  
    Order allow,deny
    Deny from all
  

  
    Header unset ETag
    FileETag None
    # RFC says only cache for 1 year
    ExpiresActive On
    ExpiresDefault "access plus 1 year"
  

  LogLevel info
  ErrorLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-ssl-error.log
  CustomLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-ssl-access.log combined
  CustomLog <%= node[:apache][:log_dir] %>/<%= @params[:name] %>-ssl-ganglia.log ganglia

  FileETag none

  RewriteEngine On
  Include <%= @params[:rewrite_config] %>-ssl*
  RewriteLog <%= node[:apache][:log_dir] %>/<%= @application_name %>-ssl-rewrite.log
  RewriteLogLevel 0

  # Canonical host
  #RewriteCond %{HTTP_HOST}   !^<%= @params[:server_name] %> [NC]
  #RewriteCond %{HTTP_HOST}   !^$
  #RewriteRule ^/(.*)$        http://<%= @params[:server_name] %>/$1 [L,R=301]

  RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|jpeg|png)$
  RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
  RewriteCond %{SCRIPT_FILENAME} !maintenance.html
  RewriteRule ^.*$ /system/maintenance.html [L]

  Include <%= @params[:local_config] %>-ssl*

<% end -%>

If you have questions feel free to ask.

Best Daniel

EDIT:

Or you just copy over this cookbooks https://github.com/neonlex/massive-octo-computing-machine I developed quickly. But OpsWorks should support this by default in the future.