MySQL5.7 忘记root密码，怎么破？

关服

# kill -0 $mysql_pid
# kill $mysql_pid

免密启动

# /usr/local/mysql57/bin/mysqld_safe --defaults-file=/etc/my.cnf --skip-grant-tables &
[1] 16688
2017-12-08T10:32:24.764472Z mysqld_safe Logging to ‘/data/database/mysql/host-30-0-0-196.err‘.
2017-12-08T10:32:24.901997Z mysqld_safe Starting mysqld daemon with databases from /data/database/mysql

改密码呀

# /usr/local/mysql57/bin/mysql -S /tmp/mysql.sock 
mysql> update mysql.user set authentication_string=password(‘4a68a3c809c38e31‘) where user=‘root‘ ; 
Query OK, 1 row affected, 1 warning (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> quit
Bye

重启

# /usr/local/mysql57/bin/mysqladmin -S /tmp/mysql3308.sock shutdown  
2017-12-08T10:33:02.360399Z mysqld_safe mysqld from pid file /data/database/mysql/host-30-0-0-196.pid ended
[1]+  Done                  阿/usr/local/mysql57/bin/mysqld_safe --defaults-file=/etc/my.cnf --skip-grant-tables

# /usr/local/mysql57/bin/mysqld_safe --defaults-file=/etc/my.cnf

还得再改一次

You must reset your password using ALTER USER statement before executing this statement.
mysql> alter user root@localhost identified by ‘4a68a3c809c38e31‘;
Query OK, 0 rows affected (0.01 sec)

可以了