1.vim /etc/my.cnf
2.在[mysqld]中添加
skip-grant-tables

# read_rnd_buffer_size = 2M
skip-grant-tables
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

3.重啟mysql
systemctl restart mysqld.service
4.用戶無密碼登錄
mysql -uroot -p (直接點擊回車，密碼為空)
5.選擇數(shù)據(jù)庫
use mysql;
6.修改root密碼
update mysql.user set authentication_string=password('新密碼') where user='用戶';
7.執(zhí)行
flush privileges;
8.退出 mysql
quit
9.編輯 /etc/my.cnf
刪除 skip-grant-tables 保存退出
10.重啟mysql
systemctl restart mysqld.service