ruby on rails - `connect': Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) (Mysql2::Error) -

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when tried run rails s on remote server got issue.

mysql working fine "rails db"

find socket file using 

mysqladmin variables | grep socket

and add socket file database.yml configuration

development:   adapter: mysql2   host: localhost   username: root   password: xxxx   database: xxxx   socket: <socket location>

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