1、首先确认服务器处于安全的状态,可以将mysql对外的端口关闭。
2、设置mysql登录无需密码:
(1)、进入my.cnf
[root@VM_0_15_centos ~]# vi /etc/my.cnf
(2)、在 [mysqld]中 添加skip-grant-tables, 如下操作,保存(wq)并退出
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
3、重启mysqld
[root@VM_0_15_centos ~]# service mysqld restart
4、登录并设置root密码
[root@VM_0_15_centos ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.24 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> USE mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> UPDATE user SET Password = password ( '123456' ) WHERE User = 'root' ;
Query OK, 4 rows affected, 1 warning (0.00 sec)
Rows matched: 4 Changed: 4 Warnings: 1
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> quit;
Bye
5、进my.cnf将mysql登录将skip-grant-tables删掉
[root@VM_0_15_centos ~]# vi /etc/my.cnf
6、重启mysqld
[root@VM_0_15_centos ~]# service mysqld restart
Redirecting to /bin/systemctl restart mysqld.service