Created
March 8, 2017 23:13
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Automatic maintenance page on migrate with AWS OpsWorks + Rails
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| # Disable maintenance page | |
| Chef::Log.info("Disabling maintenance page") | |
| file "/srv/www/your_app/shared/system/maintenance.html" do | |
| action :delete | |
| end |
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| # Enable maintenance page | |
| Chef::Log.info("Enabling maintenance page") | |
| if node["deploy"]["your_app"]["migrate"] | |
| file "/srv/www/your_app/shared/system/maintenance.html" do | |
| owner node["deploy"]["your_app"]["user"] | |
| group node["deploy"]["your_app"]["group"] | |
| mode 0755 | |
| content ::File.open("#{release_path}/deploy/maintenance.html").read | |
| action :create | |
| end | |
| end |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Your site is being upgraded</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| </head> | |
| <body> | |
| <header> | |
| <div id="logo-container"> | |
| <a href="/" class="logo"></a> | |
| </div> | |
| </header> | |
| <div id="content"> | |
| <h1 class="center-text">Your site is being upgraded</h1> | |
| <p class="center-text"> | |
| Our engineers are currently upgrading the site. Please check back in a few minutes. | |
| </p> | |
| </div> | |
| </body> | |
| </html> |
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| 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] %>; | |
| <% if @application[:log_format] %> | |
| <% @application[:log_format].each do |log_format_name| %> | |
| access_log <%= node[:nginx][:log_dir] %>/<%= @application[:domains].first %>.access.<%= log_format_name %>.log <%= log_format_name %>; | |
| <% end %> | |
| <% else %> | |
| access_log <%= node[:nginx][:log_dir] %>/<%= @application[:domains].first %>.access.log; | |
| <%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 / { | |
| if (-f <%= @application[:absolute_document_root] %>system/maintenance.html) { | |
| return 503; | |
| } | |
| try_files $uri/index.html $uri/index.htm @unicorn; | |
| } | |
| location = /ping { | |
| try_files $uri/index.html $uri/index.htm @unicorn; | |
| } | |
| location @unicorn { | |
| proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; | |
| proxy_set_header Host $http_host; | |
| proxy_redirect off; | |
| <% if node[:nginx] && node[:nginx][:proxy_read_timeout] -%> | |
| proxy_read_timeout <%= node[:nginx][:proxy_read_timeout] %>; | |
| <% end -%> | |
| <% if node[:nginx] && node[:nginx][:proxy_send_timeout] -%> | |
| proxy_send_timeout <%= node[:nginx][:proxy_send_timeout] %>; | |
| <% end -%> | |
| # If you don't find the filename in the static files | |
| # Then request it from the unicorn server | |
| if (!-f $request_filename) { | |
| proxy_pass http://unicorn_<%= @application[:domains].first %>; | |
| break; | |
| } | |
| } | |
| location /nginx_status { | |
| stub_status on; | |
| access_log off; | |
| allow 127.0.0.1; | |
| deny all; | |
| } | |
| error_page 500 502 504 /500.html; | |
| location = /500.html { | |
| root <%= @application[:absolute_document_root] %>; | |
| } | |
| error_page 503 @maintenance; | |
| location @maintenance { | |
| rewrite ^(.*)$ /system/maintenance.html break; | |
| } | |
| } | |
| <% 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 / { | |
| if (-f <%= @application[:absolute_document_root] %>system/maintenance.html) { | |
| return 503; | |
| } | |
| try_files $uri/index.html $uri/index.htm @unicorn; | |
| } | |
| location = /ping { | |
| try_files $uri/index.html $uri/index.htm @unicorn; | |
| } | |
| location @unicorn { | |
| 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 node[:nginx] && node[:nginx][:proxy_read_timeout] -%> | |
| proxy_read_timeout <%= node[:nginx][:proxy_read_timeout] %>; | |
| <% end -%> | |
| <% if node[:nginx] && node[:nginx][:proxy_send_timeout] -%> | |
| proxy_send_timeout <%= node[:nginx][:proxy_send_timeout] %>; | |
| <% end -%> | |
| # If you don't find the filename in the static files | |
| # Then request it from the unicorn server | |
| if (!-f $request_filename) { | |
| proxy_pass http://unicorn_<%= @application[:domains].first %>; | |
| break; | |
| } | |
| } | |
| error_page 500 502 504 /500.html; | |
| location = /500.html { | |
| root <%= @application[:absolute_document_root] %>; | |
| } | |
| error_page 503 @maintenance; | |
| location @maintenance { | |
| rewrite ^(.*)$ /system/maintenance.html break; | |
| } | |
| } | |
| <% end %> |
Note that this does work behind an AWS elastic load balancer (ELB). Just make sure your health check is checking /ping, or change the location in your nginx config file.
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nginx_unicorn_web_app.erb should be in your custom cookbooks under unicorn/templates/default. This is current as of AWS cookbooks v3443: https://github.com/aws/opsworks-cookbooks/blob/v3443/unicorn/templates/default/nginx_unicorn_web_app.erb.