cd /usr/src wget http://cdn.mysql.com/Downloads/MySQL-5.6/mysql-5.6.21-linux-glibc2.5-x86_64.tar.gz

tar -zxvf mysql-5.6.21-linux-glibc2.5-x86_64.tar.gz mv mysql-5.6.21-linux-glibc2.5-x86_64 /usr/local/mysql

关闭防火墙

临时关闭：service iptables stop
永久关闭：chkconfig iptables off

关闭selinux

vim /etc/sysconfig/selinux 
将SELINUX修改为DISABLED，即SELINUX=DISABLED

初始化用户组及用户

创建一个mysql用户组及用户，且这个用户是不可登录的
创建用户组：groupadd mysql
创建不可登录用户：useradd -g mysql -s /sbin/nologin -d /opt/mysql mysql
查看下创建后的用户信息：id msyql
# id mysql
uid=500(mysql) gid=500(mysql) groups=500(mysql)

创建相关目录

cd /
mkdir /data
cd /data
mkdir mysql
cd mysql 
mkdir {mysql_3306,mysql_3307}
cd /data/mysql/mysql_3306
mkdir {data,log,tmp}
cd /data/mysql/mysql_3307
mkdir {data,log,tmp} 

更改目录权限

chown -R mysql:mysql /data/mysql/
chown -R mysql:mysql /usr/local/mysql/

添加环境变量

echo 'export PATH=$PATH:/usr/local/mysql/bin' >>  /etc/profile
source /etc/profile 

复制my.cnf文件到etc目录

cd /usr/local/mysql/support-files
cp my-default.cnf /etc/my.cnf

修改my.cnf

将以下内容，全部替换 /etc/my.cnf中的内容： 

[client] 
port=3306 
socket=/tmp/mysql.sock 

[mysqld_multi] 
mysqld = /usr/local/mysql /bin/mysqld_safe 
mysqladmin = /usr/local/mysql /bin/mysqladmin 
log = /data/mysql/mysqld_multi.log 

[mysqld] 
user=mysql 
basedir = /usr/local/mysql 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

[mysqld3306] 
mysqld=mysqld 
mysqladmin=mysqladmin 
datadir=/data/mysql/mysql_3306/data 
port=3306 
server_id=3306 
socket=/tmp/mysql_3306.sock 
log-output=file 
slow_query_log = 1 
long_query_time = 1 
slow_query_log_file = /data/mysql/mysql_3306/log/slow.log 
log-error = /data/mysql/mysql_3306/log/error.log 
binlog_format = mixed 
log-bin = /data/mysql/mysql_3306/log/mysql3306_bin 
  
[mysqld3307] 
mysqld=mysqld 
mysqladmin=mysqladmin 
datadir=/data/mysql/mysql_3307/data 
port=3307 
server_id=3307 
socket=/tmp/mysql_3307.sock 
log-output=file 
slow_query_log = 1 
long_query_time = 1 
slow_query_log_file = /data/mysql/mysql_3307/log/slow.log 
log-error = /data/mysql/mysql_3307/log/error.log 
binlog_format = mixed 
log-bin = /data/mysql/mysql_3307/log/mysql3307_bin

初始化数据库

初始化3306数据库
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/mysql/mysql_3306/data --defaults-file=/etc/my.cnf 
初始化3307数据库
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/mysql/mysql_3307/data --defaults-file=/etc/my.cnf 

说明： --basedir：mysql的安装目录 --datadir：数据库的数据文件目录 --defaults-file：mysql配置文件目录
需要看两个Ok，才说明成功，如下图： cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

mysqld_multi进行多实例管理

启动全部实例：/usr/local/mysql/bin/mysqld_multi start
查看全部实例状态：/usr/local/mysql/bin/mysqld_multi report
启动单个实例：/usr/local/mysql/bin/mysqld_multi start 3306
停止单个实例：/usr/local/mysql/bin/mysqld_multi stop 3306
查看单个实例状态：/usr/local/mysql/bin/mysqld_multi report 3306

修改密码

由于mysql的root用户初始密码是空，所以需要登录mysql进行修改密码，下面以3306为例：
mysql -S /tmp/mysql_3306.sock  
set password for root@'localhost'=password('123456');
flush privileges;

新建用户及授权

一般新建数据库都需要新增一个用户，用于程序连接，这类用户只需要insert、update、delete、select权限。新增一个用户，并授权如下：
grant select,delete,update,insert on *.* to admin@'192.168.1.%' identified by '123456';
flush privileges;