This post explains how to install a global RVM (Ruby Version Manager) with Passenger 3 gem, Ruby Enterprise Edition in a Debian server machine for all users.

You probably see this error when you are trying to start apache with /etc/init.d/apache2 start and there is no effect. This error is caused by not clearing semaphores by apache and/or mod_fcgid and/or mod_passenger. You can see the list of semaphores with the command ipcs -s.

If you are using Ruby on Rails with Apache (or Apache ITK) and mod_passenger and you get an error while you are trying to upload a file through Rails application, you are probably facing the problem of wrong permissions set in the webserver_private directory of passenger. Passenger is not currently supporting ITK and is not [...]

If you run rake db:migrate and experience that error: rake aborted! Mysql::Error: query: not connected: CREATE TABLE `schema_migrations` (`version` varchar(255) NOT NULL) ENGINE=InnoDB C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:202:in `rescue in log’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:194:in `log’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/mysql_adapter.rb:289:in `execute’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:167:in `create_table’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/mysql_adapter.rb:445:in `create_table’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:430:in `initialize_schema_migrations_table’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/migration.rb:487:in `initialize’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/migration.rb:433:in `new’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/migration.rb:433:in `up’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/migration.rb:415:in `migrate’ C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0/lib/active_record/railties/databases.rake:142:in `block (2 levels) in ‘ C:/Ruby192/lib/ruby/1.9.1/rake.rb:634:in `call’ C:/Ruby192/lib/ruby/1.9.1/rake.rb:634:in `block [...]