After installing mysql5.6 in CentOS under Yum, you cannot start MySQL Daemon failed to start

If it is a new installation should not appear this problem, upgrade installation, to run Mysql_upgrade, but start MySQL error MySQL Daemon failed to start

So there's no way to run Mysql_upgrade upgrade MySQL table anymore

Because it is a newly installed database server regardless of the old data, the old MySQL database folder is deleted, and then run mysql_install_db separate command, initialize Mysql,test and other databases

After initializing all the databases, still cannot start, check the MySQL log found no permissions, because it is the root run mysql_install_db command so the initialized MySQL folder is root permissions

After you change the MySQL database permissions for the MySQL user, OK starts successfully!

mysqladmin-u root password ' password '

Reset your password.