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Question

Rails 4 mysql2 error when deploying to production

Posted February 5, 2016 6.5k views
Ruby on RailsUbuntuMySQL

I’ve got a virtual server (Digital Ocean Droplet) set up with Capistrano 3. I’ve successfully gotten all of the directories set up and the project directory has the current folder in it, containing config/database.yml file. I can’t get it deployed to where it will run. It gets stuck on the rake db:migrate phase. rake assets:precompile successfully works, so I think it must be something with my database.yml file. The “production” block looks like this:

*config/database.yml (production part)
*

production:
  adapter: mysql2
  encoding: utf8
  database: capstone_production
  username: <%= ENV['DATABASE_USERNAME'] %>
  password: <%= ENV['DATABASE_PASSWORD'] %>
  host: localhost
  port: /var/run/mysqld/mysqld.sock

I have checked that the file is valid YAML with YAMLLint utility. Also, the environment variables echo properly with (root) credentials that I am able to use for mysql login. When I run cap production deploy:check, everything is good. However, running cap production deploy does everything okay until it gets to the rake db:migrate Capistrano process. Then it aborts and throws up this:

The deploy has failed with an error: #<SSHKit::Runner::ExecuteError: Exception while executing on host 107.170.105.223: Exception while executing on host 107.170.105.223: rake exit status: 1
rake stdout: rake aborted!
Mysql2::Error: Access denied for user 'root'@'localhost' (using password: NO)
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/gems/mysql2-0.3.20/lib/mysql2/client.rb:70:in `connect'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/gems/mysql2-0.3.20/lib/mysql2/client.rb:70:in `initialize'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/connection_handling.rb:87:in `connection'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/migration.rb:916:in `initialize'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/migration.rb:814:in `new'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/migration.rb:814:in `up'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/migration.rb:792:in `migrate'
/home/deploy/apps/capstone_project/shared/bundle/ruby/2.1.0/bundler/gems/rails-331210df7c8a/activerecord/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
rake stderr: Nothing written

I’ve tried many combinations of YAML syntax and restarted mysql server, puma server, and NGINX server over and over again. This is crazy, please help.

Thank you

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barnabasbulpett
By:
barnabasbulpett

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2 comments
  • gndo February 5, 2016
    Reply Report

    Make sure your username and password environment variables exists and are legit for the production database. 

    echo "show databases;" | mysql --user=$DATABASE_USER --password=$DATABASE_PASSWORD capstone_production
  • barnabasbulpett February 6, 2016
    Reply Report

    Thanks, that part worked just fine. The problem seems to stem from this:

    Mysql2::Error: Access denied for user 'root'@'localhost' (using password: NO)

    From what I’ve read in MySQL docs, this error is thrown when you try to login without password. So I’ve got all the right credentials - I can even hard code the actual username and password into the YAML file and same error. For some reason when Capistrano executes the following command (via cap production deploy or cap production deploy:migrate), it’s not including the password from database.yml: 

    INFO [85893e95] Running ~/.rvm/bin/rvm default do bundle exec rake db:migrate on 107.170.105.223
DEBUG [85893e95] Command: cd /home/deploy/apps/capstone_project/releases/20160205235633 && ( export RAILS_ENV="production" ; ~/.rvm/bin/rvm default do bundle exec rake db:migrate )

    How to ensure that Capistrano executes the migration just like I would locally in development?

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1 answer
ryanbooker April 2, 2018

Did you ever resolve this? I have the same issue. My database.yml has the correct credentials, but Capistrano always tries root with no password. The database.yml is set up to use a deploy user with a password.

To me it seems that Capistrano is not using the correct Rails.Env.

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  • ryanbooker April 2, 2018

    I worked it out. I don’t know if this will be the same for you, but for me it was that database.yml was updated locally, but not in the shared location on the server. PEBCAK. :)

    Reply Report

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