新生在不會編譯的情況下：
1、安裝PHP5
yum install php
根據提示輸入Y直到安裝完成
2、安裝PHP組件，使 PHP5 支持 MySQL
yum install php-mysql php-gd libjpeg* php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc php-mbstring php-mcrypt php-bcmath php-mhash libmcrypt
[root@VM_18_87_centos ~]# service mysql start
Redirecting to /bin/systemctl start mysql.service
Failed to start mysql.service: Unit mysql.service failed to load: No such file or directory.
[root@VM_18_87_centos mysql-5.5.3-m3]# service mysql status
Redirecting to /bin/systemctl status mysql.service
* mysql.service
Loaded: not-found (Reason: No such file or directory)
Active: inactive (dead)
**在網上發現解決辦法：
sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
**然后移除已安裝的Mysql后，再次安裝：
yum install mysql mysql-server mysql-libs mysql-server
最后重啟Mysql服務：
[root@VM_18_87_centos ~]# service mysql start
Redirecting to /bin/systemctl start mysql.service
可以啦：
[root@VM_18_87_centos ~]# service mysql status
Redirecting to /bin/systemctl status mysql.service
* mysqld.service - MySQL Community Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2016-11-20 16:02:08 CST; 3s ago
Process: 16986 ExecStartPost=/usr/bin/mysql-systemd-start post (code=exited, status=0/SUCCESS)
Process: 16923 ExecStartPre=/usr/bin/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 16985 (mysqld_safe)
CGroup: /system.slice/mysqld.service
|-16985 /bin/sh /usr/bin/mysqld_safe
`-17139 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: Support MySQL by buying s...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: Note: new default config ...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: Please make sure your con...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: WARNING: Default config f...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: This file will be read by...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: If you do not want to use...
Nov 20 16:02:07 VM_18_87_centos mysql-systemd-start[16923]: --defaults-file argument ...
Nov 20 16:02:07 VM_18_87_centos mysqld_safe[16985]: 161120 16:02:07 mysqld_safe Logg....
Nov 20 16:02:07 VM_18_87_centos mysqld_safe[16985]: 161120 16:02:07 mysqld_safe Star...l
Nov 20 16:02:08 VM_18_87_centos systemd[1]: Started MySQL Community Server.
Hint: Some lines were ellipsized, use -l to show in full.
2016.11.30centOS6安裝mysql基於以上步驟后，mysql服務無法啟動：
mysql: unrecognized service
使用下面的方法：
安裝完Mysql后設置root密碼：
1.一鍵安裝php-fpm:yum install php-fpm
2.啟動httpd服務：service httpd start
3.啟動mysql服務：service mysql start
4.設置用SET PASSWORD命令
mysql -u root
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');
5.創建數據庫，拷貝wordpress到CentOS的文件系統；