1. 首先检查机器里是否已经存在MySQL
$ rpm -qa | grep mysql
2. 去官网下载相应的rpm包：https://dev.mysql.com/downloads/mysql/
mysql-community-common-5.7.-.el6.x86_64.rpm
mysql-community-client-5.7.-.el6.x86_64.rpm
mysql-community-server-5.7.-.el6.x86_64.rpm
mysql-community-libs-5.7.-.el6.x86_64.rpm
3. 上传到/usr/local/mysql文件夹，进行安装mysql
按照以下顺序进行安装，因为它们之间存在依赖关系
#common --> libs --> clients --> server rpm -ivh mysql-community-common-5.7.-.el6.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.-.el6.x86_64.rpm
rpm -ivh mysql-community-clients-5.7.-.el6.x86_64.rpm
rpm -ivh mysql-community-server-5.7.-.el6.x86_64.rpm
如果不按照这样的顺序，将会出现如下错误：
# error: Failed dependencies: \
libnuma.so.()(64bit) is needed by mysql-community-server-5.7.-.el6.x86_64 \
libnuma.so.(libnuma_1.)(64bit) is needed by mysql-community-server-5.7.-.el6.x86_64 \
libnuma.so.(libnuma_1.)(64bit) is needed by mysql-community-server-5.7.-.el6.x86_64
解决方法：
$ yum install -y numactl
4. 安装好后，可以去检查是否存在MySQL的配置文件或者MySQL的命令在/usr/bin下
#mysql配置文件
$ ls /etc/my.cnf # mysql命令
$ cd /usr/bin/
$ ls | grep mysql
$ /etc/init.d/mysqld start
$ ps aux|grep mysqld