1、查看系统版本
uname -a
2、卸载old mysql
rpm -qa|grep -i mysql
rpm -ev MySQL-client-5.5.25a-1.rhel5 如果提示依赖错误，增加–nodeps
find / -name mysql
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql
rm -rf /usr/lib64/mysql
rm -rf /etc/my.cnf
rpm -qa|grep -i mysql
3、下载mysql，如果是centos6系列一定要el6，不然出现glibc安装错误
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/numactl-2.0.9-2.el6.x86_64.rpm
tar -xvf mysql-5.7.16-1.el6.x86_64.rpm-bundle.tar
4、安装基础包
yum install gcc gcc-c++ ncurses-devel perl
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/numactl-2.0.9-2.el6.x86_64.rpm
＃这个包在安装server提示libnuma.so.1
5、安装mysql（顺序：common-libs-client-server，里面compat，test，devel，embedded根据需要安装)
rpm -ivh mysql-community-common-5.7.18-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.16-1.el6.x86_64.rpm
rpm -ivh mysql-community-client-5.7.16-1.el6.x86_64.rpm
rpm -ivh mysql-community-server-5.7.16-1.el6.x86_64.rpm
(遇到问题error: Failed dependencies:
libnuma.so.1()(64bit) is needed by mysql-community-server-5.7.16-1.el6.x86_64)
yum install libnuma.so.1 安装后的包是numactl-2.0.9-2.el6.i686.rpm，问题依旧，经分析后重新下载 yum -y install libnuma.so.1.x86_64，重新编译安装，成功！原因估计是系统不兼容i686）
6、启动服务
service mysqld start
7、查看root 临时密码
grep ‘temporary password’ /var/log/mysqld.log
8、修改root密码
mysql -uroot -p
ALTER USER ‘root’@’localhost’ IDENTIFIED BY ‘MyNewPass4!’;
设置用户 root 可以在任意 IP 下被访问：
grant all privileges on . to root@”%” identified by “新密码”;
设置用户 root 可以在本地被访问：
grant all privileges on . to root@”localhost” identified by “新密码”;
刷新权限使之生效：
flush privileges;
启动 MySQL 服务：
service mysqld start
关闭 MySQL 服务：
service mysqld stop
重启 MySQL 服务：
service mysqld restart
查看 MySQL 的状态：
service mysqld status
查看 MySQL 的字符集：
mysql> show variables like ‘%character%‘;
修改字符集为UTF-8，找到my.cnf配置文件，修改如下：
重启MySQL后生效。
忘记密码时，可用如下方法重置：
# service mysqld stop
# mysqld_safe --user=root --skip-grant-tables --skip-networking &
# mysql -u root
mysql> use mysql;
mysql> update user set password=password("new_password") where user="root";
mysql> flush privileges;
