https://dev.mysql.com/doc/refman/5.7/en/binary-installation.html
在官网下载mysql-5.7.18-linux-glibc2.5-x86_64.tar
解压到/usr/local目录
添加mysql用户
shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
建立mysql默认的配置文件/etc/my.cnf
[mysqld]
user = mysql
port = 3306
server_id = 1
socket=/tmp/mysql.sock
basedir =/usr/local/mysql
datadir =/usr/local/mysql/data # 数据路径
建立data文件夹，并给mysql用户赋予权限
shell> chmod 750 data
shell> chown -R mysql .
shell> chgrp -R mysql .
在目录下对mysqld初始化
bin/mysqld –initialize –user=mysql
添加服务，启动
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
service mysqld start
此时mysql建立root账号，密码为随机的字符串
登录，mysql强制需要更改密码，语法如下：
https://dev.mysql.com/doc/refman/5.7/en/alter-user.html
alter user 'root'@'localhost' identified by 'newpswd'重新登录，见到熟悉的界面
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.7.18 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.
mysql>
当然啦，为了省点事，可以这么写：
bin/mysqld –initialize-insecure –user=mysql
这样建立的root账户初始没有密码。