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Fast Rails + Heroku Configuration

View Gemfile
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group :production do
gem 'unicorn'
 
# Enable gzip compression on heroku, but don't compress images.
gem 'heroku-deflater'
 
# Heroku injects it if it's not in there already
gem 'rails_12factor'
end
 
gem 'memcachier'
gem 'dalli'
# Fast IO for memcache
gem 'kgio'
 
# Serve static assets through Rack + Memcache
# https://devcenter.heroku.com/articles/rack-cache-memcached-rails31
gem 'rack-cache'
View Gemfile
1
web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
View Gemfile

Free addons!

heroku addons:add memcachier
heroku addons:add mandrill:starter
heroku addons:add newrelic
heroku addons:add pgbackups:auto-month
heroku addons:add papertrail
View Gemfile
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# config/environments/production.rb
 
# ...
 
# Enable Rails's static asset server for Heroku
config.serve_static_assets = true
 
# Set static assets cache header. rack-cache will cache those.
config.static_cache_control = "public, max-age=31536000"
 
config.cache_store = :dalli_store
 
client = Dalli::Client.new(ENV["MEMCACHIER_SERVERS"],
:value_max_bytes => 10485760,
:expires_in => 86400) # 1 day
 
# Configure rack-cache for using memcachier
config.action_dispatch.rack_cache = {
:metastore => client,
:entitystore => client
}
 
# Send emails via mandrill
 
ActionMailer::Base.delivery_method = :smtp
config.action_mailer.smtp_settings = {
:address => 'smtp.mandrillapp.com',
:port => '587',
:authentication => :plain,
:user_name => ENV['MANDRILL_USERNAME'],
:password => ENV['MANDRILL_APIKEY'],
:domain => 'heroku.com',
}
 
# ...
 
View Gemfile
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# config/unicorn.rb
 
worker_processes 3
timeout 30
preload_app true
 
before_fork do |server, worker|
# Replace with MongoDB or whatever
if defined?(ActiveRecord::Base)
ActiveRecord::Base.connection.disconnect!
Rails.logger.info('Disconnected from ActiveRecord')
end
 
# If you are using Redis but not Resque, change this
if defined?(Resque)
Resque.redis.quit
Rails.logger.info('Disconnected from Redis')
end
 
sleep 1
end
 
after_fork do |server, worker|
# Replace with MongoDB or whatever
if defined?(ActiveRecord::Base)
ActiveRecord::Base.establish_connection
Rails.logger.info('Connected to ActiveRecord')
end
 
# If you are using Redis but not Resque, change this
if defined?(Resque)
Resque.redis = ENV['REDIS_URI']
Rails.logger.info('Connected to Redis')
end
end

Awesome thanks !

Some suggestions:

  • sucker_punch (to avoir using workers for just emails)
  • add a comment on new relic regarding the monitoring feature to keep the app online without using external services

sucker_punch is great but one must be really carefull if you aren't using ruby 2.0.

Can't precompile assets: undefined method `day' for 1:Fixnum
expires_in takes the "default TTL in seconds if you do not pass TTL as a parameter to an individual operation, defaults to 0 or forever" [source: http://www.rubydoc.info/github/mperham/dalli/Dalli/Client]
If it's 1 day you want then value should be 86400

client = Dalli::Client.new(ENV["MEMCACHIER_SERVERS"],
                             :value_max_bytes => 10485760,
                             :expires_in => 86400)

These settings, minus Memcache, are in Suspenders. I prefer fronting my Heroku apps with Fastly to Memcache for the fastest static asset serving that only hits the Heroku dynos once per cache via origin pull.

You can change the Sendgrid by the Mandrill. In the free plan, they have the double of emails.

Owner

@mathieugagne Thanks! I just fixed it!

Owner

@maurogeorge Done!

Owner

@croaky Fastly charges a minimum of $50 a month right?

Could use a gem 'newrelic' line in the Gemfile. I added the addon but missed the gem, and was wondering why Newrelic was "waiting on data" :grin:

do u need to have workers?

The command is now heroku addons:create instead of heroku addons:add

Also, heroku addons:add pgbackups:auto-month doesn't exist. The only postgres backup system I see now is heroku addons:create autobus

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