Mysql2::Error (Can't connect to local MySQL server through socket 'MySQL' (2)):

default: &default


adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: xxxxx
  socket: MySQL
  host: localhost

Mysql2::Error (Can't connect to local MySQL server through socket 'MySQL' (2)):

/home.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/mysql2-0.4.5/lib/mysql2/client.rb:89:in `connect'
/home.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/mysql2-0.4.5/lib/mysql2/client.rb:89:in `initialize'
/home.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/connection_adapters/mysql2_adapter.rb:25:in `new'
/home.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/ ...so on