I use the below order:[root@localhost /]# yum install -y mysql mysql-server mysql-develto install mysql.After installed I want to start mysql by:[root@localhost /]# /etc/init.d/mysqld start-bash: /etc/init.d/mysqld: there is no file or directoryBut you see, I can not start it in this way.So, I use:find / -name mysqld to find mysqld, I get:[root@localhost /]# find / -name mysqld /usr/libexec/mysqldSo, I use the:/usr/libexec/mysqld start to start mysql, but get the error:[root@localhost /]# /usr/libexec/mysqld start  2017-05-19 14:28:17 139762539387072 [Warning] option 'open_files_limit': unsigned value 18446744073709551615 adjusted to 4294967295  2017-05-19 14:28:17 139762539387072 [Note] /usr/libexec/mysqld (mysqld 10.1.20-MariaDB) starting as process 82223 ...  2017-05-19 14:28:17 139762539387072 [Warning] Could not increase number of max_open_files to more than 1024 (request: 5035)  2017-05-19 14:28:17 139762539387072 [ERROR] WSREP: rsync SST method requires wsrep_cluster_address to be configured on startup.  And get stuck here.Someone know how to resolve it?
There is no mysqld under the /etc/init.d after I installed the Mysql use yum
centos;yum;mysql
On CentOS 7 you would use the following command.$ sudo systemctl start mysqldAnd if you want mysqld to start automatically on boot you could do$ sudo systemctl enable mysqldEdit: Are you sure that you installed MySQL and you are not trying to install MariaDB instead? MariaDB is the default database engine for CentOS I believe. You can check that it actually got installed with$ rpm -q mysqldElse, I would recommend following the instructions here 