mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists

While starting mysql server 5.7.17 using mysqld_safe, following error occcours. 2017-02-10T17:05:44.870970Z mysqld_safe Logging to '/var/log/mysql/error.log'. 2017-02-10T17:05:44.872874Z mysqld_safe Logging to '/var/log/mysql/error.log'. 2017-02-10T17:05:44.874547Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists. How to fix it ?