无法在 ubuntu 16 上使用 --skip-grant-tables 重置 root 密码

Can#39;t reset root password with --skip-grant-tables on ubuntu 16(无法在 ubuntu 16 上使用 --skip-grant-tables 重置 root 密码)

问题描述

我正在尝试按照 MysqlPasswordReset 重置根密码，但是当我尝试启动服务器时使用 --skip-grant-tables 服务器不会启动

I am trying to reset the root password following MysqlPasswordReset but when I try to start the server with --skip-grant-tables the server doesn't start

• Ubuntu 16.04.1 LTS(GNU/Linux 4.4.0-59-generic x86_64)
• mysql Ver 14.14 Distrib 5.7.17，适用于 Linux (x86_64)

服务器正在运行

$ mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

停止服务器

$ sudo /etc/init.d/mysql stop
[ ok ] Stopping mysql (via systemctl): mysql.service.

尝试从 --skip-grant-tables 开始

Trying to start with --skip-grant-tables

sudo /usr/sbin/mysqld --skip-grant-tables --skip-networking &
[1] 9856

无需密码即可连接

$ mysql -u root
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
[1]+  Exit 1                  sudo /usr/sbin/mysqld --skip-grant-tables --skip-networking

我也尝试从mysql_safe开始(error.log为空)

I also tried to start with mysql_safe (error.log is empty)

sudo mysqld_safe --skip-grant-tables
2017-02-01T16:33:31.382105Z mysqld_safe Logging to syslog.
2017-02-01T16:33:31.383942Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2017-02-01T16:33:31.386058Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2017-02-01T16:33:31.388009Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists.

推荐答案

我发现mysql服务停止时mysql.sock被删除，mysqld_safe无法创建(我没找到原因)，所以我的解决方案是在启动 mysqld_safe 之前备份 sock 文件夹并恢复

I found that the mysql.sock is deleted when the mysql service is stoped and mysqld_safe can't create it (I couldn't find the reason), so my solution was back up the sock folder and restore before start mysqld_safe

启动服务器

$ sudo service mysql start

进入袜子文件夹

$ cd /var/run

备份袜子

$ sudo cp -rp ./mysqld ./mysqld.bak

停止服务器

$ sudo service mysql stop

恢复袜子

$ sudo mv ./mysqld.bak ./mysqld

启动mysqld_safe

Start mysqld_safe

$ sudo mysqld_safe --skip-grant-tables --skip-networking &

初始化mysql shell

Init mysql shell

mysql -u root

修改密码

FLUSH PRIVILEGES;

SET PASSWORD FOR root@'localhost' = PASSWORD('my_new_password');

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