这里写目录标题
更改登录密码：
有权限账号能登录mysql中：
修改当前用户密码
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set password=password('redhat'); 有权限账号不能登录mysql中：
先停mysql,修改配置文件my.cnf
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systemctl stop mariadb #停止mysql
vim /etc/my.cnf #更改配置文件在mysqld下新增一行 skip-grant-tables
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[mysqld]
skip-grant-tables重启mysql
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systemctl start mariadbmysql 空密码进入
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mysql -uroot进入mysql库，查看user表：
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use mysql;
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select Host,User,Password from mysql.user; 添加密码：
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grant all on *.* to root@localhost identified by '123456' with grant option; mysql5.6版本命令
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update mysql.user set password=password('123456') where user='root';
flush privileges; #刷新
exitmysql5.7版本命令
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update user set authentication_string=password('123456') where user='root' and Host='localhost';
flush privileges; #刷新
exit修改密码8.0版本
新搭建好的mysql,查看默认密码，如没有则单机登录到mysql
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cat /var/log/mysqld.log | grep localhost 更改密码为空即'mima'处无内容，即为免密（亦可设置你习惯的密码，就不是免密了）
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alter user 'root'@'localhost' identified by 'mima';
flush privileges;
exit改完后：
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vim /etc/my.cnf
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#skip-grant-tables #注释 重启mysql服务
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systemctl restart mariadb mysql登录不上了
大概率是装有其他mysql，默认是在/tmp/mysql.sock
报错信息如下：
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
查找到mysqld.sock 对应位置添加软连接
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ps -ef | grep mysql
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rm /var/run/mysqld/mysqld.sock
ln -s /tmp/mysql.sock /var/run/mysqld/mysqld.sock重启mysql
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service mysqld restart 本机安装了5.6后，又安装了mysql8.0
ubuntu22 发现有多个mysql 导致未找到mysqld.sock
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)进行删除
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dpkg -l | grep mysql
#ii mysql-client-core-8.0 8.0.37-0ubuntu0.22.04.3 amd64 MySQL database core client binaries
apt-get remove mysql-client-core-8.0
重启mysql恢复
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systemctl status mysql