Centos7 安装 mysql5.7.23

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1. 下载mysql yum包
   http://dev.mysql.com/downloads/repo/yum/

2. 安装yum包

   rpm -Uvh mysql80-community-release-el7-1.noarch.rpm
   

3. 安装mysql，此过程需要一定时间

   yum install  -y  mysql-community-server
   

4. 启动mysql

   service mysqld start
   

5. 查看mysql的状态

   service mysqld status
   

6. 获取临时密码，因为是rpm安装，error log文件在/var/log/mysqld.log

   grep 'temporary password' /var/log/mysqld.log
   

   

7. 登录并修改密码

   mysql -uroot -p 临时密码
   alter user 'root'@'localhost' identified by '123456';
   

   此时会报错：
   ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
   必须修改两个全局的参数：

   5.7：
   set global validate_password_policy=0;
   set global validate_password_length=1;
   5.8：
   set global validate_password.policy=0;
   set global validate_password.length=1;
   

8. 授权远程登录

   create user  'admin'@'%'  identified by '123456';
   grant all on  *.*  to  'admin'@'%';
   flush privileges;
   

9. 开机自启动

   chkconfig --levels 235 mysqld on
   

10. 设置字符集

    vim /etc/my.cnf
    
    [mysqld]   
    character_set_server = utf8
    
    [mysql]
    default-character-set = utf8
    
    查看：
    SHOW VARIABLES LIKE 'character%' 
    

11. 远程连接报错相关
    mysql8 之前的版本中加密规则是mysql_native_password，而在mysql8之后,加密规则是caching_sha2_password。

 # 修改加密规则
 alter user 'root'@'localhost' identified by '123456' password expire never;
 # 更新用户密码
 alter user 'root'@'localhost' identified with mysql_native_password by '123456';
 # 刷新权限 
 flush privileges;