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

2. 安裝yum包

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

3. 安裝mysql，此過程需要一定時間

   yum install  -y  mysql-community-server
   

4. 啟動mysql

   service mysqld start
   

5. 檢視mysql的狀態

   service mysqld status
   

6. 獲取臨時密碼，因為是rpm安裝，error log檔案在/var/log/mysqld.log

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

   

7. 登入並修改密碼

   mysql -uroot -p 臨時密碼
   alter user 'root'@'localhost' identified by '123456';
   

   此時會報錯：
   ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
   必須修改兩個全域性的引數：

   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. 授權遠端登入

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

9. 開機自啟動

   chkconfig --levels 235 mysqld on
   

10. 設定字符集

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

11. 遠端連線報錯相關
    mysql8 之前的版本中加密規則是mysql_native_password，而在mysql8之後,加密規則是caching_sha2_password。

 # 修改加密規則
 alter user 'root'@'localhost' identified by '123456' password expire never;
 # 更新使用者密碼
 alter user 'root'@'localhost' identified with mysql_native_password by '123456';
 # 重新整理許可權 
 flush privileges;