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dbg:  >>> start()
 * Starting  ...
dbg:  >>> get_slot_config()
dbg:  srv                0
dbg:  srv_slot           0
dbg:  srv_num            
dbg:  tmp_eval           mysql_slot_0[@]
dbg:  conf_d_parameters  
dbg:  MY_SUFFIX          
dbg:  chroot dir => 
dbg:  niceness   => 
dbg:  basedir    => /usr
dbg:  datadir    => /var/lib/mysql
dbg:  pidfile    => /var/run/mysqld/mysqld.pid
dbg:  socket     => /var/run/mysqld/mysqld.sock
dbg:  Unamanged  =>  
dbg:  <<< get_slot_config() ok
dbg:  >>> checkconfig("/var/lib/mysql")
 * MySQL datadir is empty or invalid
 * Please check your my.cnf : /etc/mysql/my.cnf
dbg:  <<< checkconfig() KO
dbg:  <<< start()                                                                                                                                               [ !! ]
 * ERROR: mysql failed to start