https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/ ###一般每个都下载下，在同版本下！
02、安装rpm文件
yum localinstall -y * ###把需要安装的rpm文件放到一个文件夹中
yum install -y mysql-server ###利用本地或yum源，自动下载安装
03、修改/etc/my.cnf
[client]
default-character-set=utf8 ###设定客户端连接字符集
[mysql]
auto-rehash
####自动补全命令
default-character-set=utf8 ####mysql连接字符集
[mysqld]
innodb_buffer_pool_size = 128M
join_buffer_size = 128M
sort_buffer_size = 2M
read_rnd_buffer_size = 2M
#basedir=/home/data/mysql
###定义MySQL存放位置
datadir=/mysql/data
###设定数据存放位置
socket=/mysql/data/mysql.sock
###设定服务端字符集
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
symbolic-links=0
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
[mysqld_safe]
log-error=/mysql/data/mysqld.log
pid-file=/mysql/data/mysqld.pid
###建议跟数据存放路径
04、修改/etc/init.d/mysqld
[root@zabbix_proxy ~]# cat /etc/init.d/mysqld
#!/bin/sh
#
# mysqld This shell script takes care of starting and stopping
# the MySQL subsystem (mysqld).
#
# chkconfig: - 64 36
# description: MySQL database server.
# processname: mysqld
config=/etc/my.cnf ###指定配置文件，启动会优先找config的配置项
05、建立sock连接文件
ln -sf /mysql/data/mysql.sock /var/lib/mysql/mysql.sock
06、启动测试
service mysqld start
tail -f /mysql/data/mysqld.log ###查看日志很关键
关键点：
service mysqld start 启动的实质就是mysqld_safe启动，而mysqld ,只需指定config=/etc/my.cnf即可
/usr/bin/mysqld_safe --defaults-file=/etc/my.cnf &