Problem Mysql on Centos 7

[Groby]

 

i have no plan -.- 

yum updateStep2: install the apache and mysql and other "importent" stuff like libs.
yum install -y mysql mysql-server mysql-devel mysql-libs php-mysql httpd php gcc-c++ libstdc++.so.6 libz.so.1 libstdc++-libc6.2-2.so.3 libgssapi_krb5.so.2 screen lm_sensors lm_sensors-devel gtk+ php-devel
yum groupinstall -y 'MySQL Database' 'Web Server' 'Development Tools' 'Development Libraries'Step3: start your apache and mysql server with booting up the server
chkconfig --add httpd
chkconfig httpd on
chkconfig --add mysqld
chkconfig mysqld onStep4: start your apache and mysql server
service httpd start
service mysqld start

not working to  service mysqld start
 
ty for Help  (my english is bad )