[root@localhost mysql]# su - mysql -c "mysql_install_db --rpm --user=mysql"
su: warning: cannot change directory to /var/lib/mysql: No such file or directory
FATAL ERROR /mysqld not found!
[root@localhost mysql]# mkdir /var/lib/mysql
[root@localhost mysql]# chown mysql: /var/lib/mysql
[root@localhost mysql]# su - mysql -c "mysql_install_db --rpm --user=mysql"
FATAL ERROR /mysqld not found!
[root@localhost mysql]#