centos7下mysql初始密码修改的两种方法

àì夳堔傛蜴生んèń 2022-05-24 13:48 206阅读 0赞

centos7安装mysql时会得到一个系统给的初始密码，因此我们无法直接登录mysql，需要先对其进行修改

我安装的是mysql5.6

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
    sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm
    yum install -y mysql mysql-server

在修改前要先启动mysql,并检查其运行状态

sudo systemctl start mysqld
    service mysqld status

接着修改mysql密码

方法一：

grep 'temporary password' /var/log/mysqld.log

运行后会得到一个密码，这里我的centos7.4下没有反应，故尝试第二种方法

方法二：

该方法先修改mysql配置文件使其可以无密码登录，让后修改密码，之后便复原配置文件

修改/etc/my.cnf

vim /etc/my.cnf

配置文件添加skip-grant-tables

[root@VM_0_8_centos ~]# vim /etc/my.cnf
    
    # For advice on how to change settings please see
    # http://dev.mysql.com/doc/refman/5.6/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                       此处！！！！！！
    # Disabling symbolic-links is recommended to prevent assorted security risks
    symbolic-links=0

保存后重启mysql

systemctl restart mysql

即可免密登录，命令行输入mysql直接登录

选择mysql数据库，输入下列命令重置密码，'new-password'即为所设置密码

USE mysql;

mysql> UPDATE user SET Password = 'new-password' WHERE User = 'root';

修改完成后输入exit退出，重新回到/etc/my.cnf该文件删除之前添加语句即可完成