因爲錯誤代碼退出控制進程，mysqld.service的做業失敗？看這裏...

CentOS 7安裝MySql5.7問題

mysql

報錯Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.須要在/etc/my.cnf中添加

[mysqld]

user=mysql # 使用mysql用戶

報錯Access denied for user 'root'@'localhost' (using password:YES),須要修改密碼

首先配置/etc/my.cnf中添加

[mysqld]

skip-grant-tables=1# 略過密碼驗證

而後systemctl restart mysqld重啓後進入mysql

use mysql;

update user set password=password("*******") where user="*******";  #修改密碼報錯

報錯ERROR 1054 (42S22): Unknown column 'password' in 'field list' 5.7版本下的mysql數據庫下已經沒有password這個字段了，password字段改爲了authentication_string

update mysql.user set authentication_string=password('*******') where user='*******';  #修改密碼成功

flush privileges;  #當即生效

在mysql命令行報錯ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

SET PASSWORD = PASSWORD('123456');

ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;

flush privileges;

phpmyadmin

報錯：配置文件如今須要一個短語密碼。

在 phpMyAdmin 文件中找到一個文件「config.sample.inc.php」，這是phpMyAdmin配置文件的樣本文件，咱們須要把該文件複製，而後重命名爲「config.inc.php」，config.inc.php是phpMyAdmin的配置文件，編輯器打開 config.inc.php 搜索下面一行代碼$cfg\['blowfish\_secret'\] = '';,將後面單引號裏面隨便填入個字符串便可,打開phpMyAdmin/libraries/config.default.php文件$cfg['blowfish_secret'] = '';修改成一樣密碼

報錯：$cfg['TempDir'] (./tmp/) 讀取失敗且不能創建緩存, phpMyAdmin運行速度將受影響.

手動在phpmyadmin的根目錄創建tmp文件,賦予讀寫權限便可。

-報錯：mysqli_real_connect(): Headers and client library minor version mismatch. Headers:50556 Library:50637···

根據安裝php版本先刪除php-mysqlyum remove php-mysql,而後安裝php-mysqlnd，個人php事7.2因此用yum install php72w-mysqlnd

最後killall php-fpm而後再次啓動php-fpm便可