Secret generation in redmine installation fails with error in mysql2/mysql2

Question

I am trying to install redmine 2.3.x on my Debian vServer. I already managed to build ruby from source and installed gems, rails and the apache passenger module. It should work until that point. I used the turotial at domainfactory: http://www.df.eu/de/service/df-faq/cloudserver/anleitungen/ruby-on-rails-installieren-debian-ubuntu/ .

After that I downloaded and extracted the redmine application as described here: http://www.redmine.org/projects/redmine/wiki/RedmineInstall#Installation-procedure. I created a mysql account and database, made a copy of the config/database.yml.example -> config/database.yml and filled in the correct values.

After that I installed bundler with

gem install bundler

And did go on with preparing the environment:

bundle install --without development test

All these commands did succeed.

After that I wanted to generate the secret token with the fallowing command:

rake generate_secret_token

The execution was interrupted with the fallowing message:

 # rake generate_secret_token --trace
rake aborted!
cannot load such file -- mysql2/mysql2
/usr/local/lib/ruby/gems/2.0.0/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require'
/usr/local/lib/ruby/gems/2.0.0/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `<top (required)>'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
/usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
/var/www/potato/config/application.rb:7:in `<top (required)>'
/usr/local/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:36:in `require'
/usr/local/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:36:in `require'
/var/www/potato/Rakefile:5:in `<top (required)>'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `load'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `load_rakefile'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:637:in `raw_load_rakefile'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:94:in `block in load_rakefile'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:93:in `load_rakefile'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:77:in `block in run'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
/usr/local/lib/ruby/gems/2.0.0/gems/rake-10.1.0/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'

I was trying to resolve this by checking versions and installed gems.

Ruby: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
Rails: Rails 3.2.13
Gems: 1.8.25
Redmine: 2.3.3

I verified with gem list --local that the gem "mysql2" is installed.

gem "mysql": mysql2 (0.3.13)

As the problem seems to rely on this, I tried reinstalling the package, but this did not help.

What did I wrong here?

Thanks in advance, Sebastian Büttner

Answer 1

I found this error happens if you don't have the following package installed in your system (at least on Debian 9). So run command:

apt-get install default-libmysqlclient-dev

Answer 2

1. try bundle exec rake generate_secret_token

2. (if #1 does not help) Check if mysql2 is presented in output list for bundle list (it is different with gem list!). Be careful that redmine install DB adapter according to your settings in database.yml (but I think you install it correctly)

Answer 3

Please, check if you have necessary VC runtime installed. Please, check the VC runtime dll version, your mysql vendor dll is dependent upon.