Can't connect to MySQL server on 'mysql' (111)

[mtnstar]

when running bleib @ hitobito demo prod inside migration container init step 'wait-for-database' the following error occurs if the mysql db is not available yet:

Mysql2::Error::ConnectionError: Can't connect to MySQL server on 'mysql' (111)
/opt/app-root/src/bundle/ruby/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect'
/opt/app-root/src/bundle/ruby/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:40:in `new'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:40:in `new_client'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:23:in `mysql2_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:882:in `public_send'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:882:in `new_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:926:in `checkout_new_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:905:in `try_to_checkout_new_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:866:in `acquire_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:588:in `checkout'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:428:in `connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:1128:in `retrieve_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_handling.rb:327:in `retrieve_connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/activerecord-6.1.4.1/lib/active_record/connection_handling.rb:283:in `connection'
/opt/app-root/src/bundle/ruby/2.7.0/gems/bleib-0.0.10/lib/bleib/database.rb:38:in `database_down?'
/opt/app-root/src/bundle/ruby/2.7.0/gems/bleib-0.0.10/lib/bleib/database.rb:15:in `wait_for_connection'

so the init container is being restarted until the mysql service is available.

bleib should not raise an error in that case, is should just wait until service is available 🐕 bleib!