安装mysql后必须要做的一件事

Step 1. 检查默认账户和密码

$cat /etc/mysql/debian.cnf  # 在ubuntu下查看默认账户名和密码

会看到

[client]
host     = localhost
user     = debian-sys-maint
password = ****************
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = ****************
socket   = /var/run/mysqld/mysqld.sock

Step 2. 使用默认账户登录并修改root密码

$mysql -u debian-sys-maint -p
Enter password:

mysql> use mysql;
mysql> update user set authentication_string=PASSWORD('密码') and plugin='mysql_native_password' where User='root';  # 注意此处PASSWORD() 函数不可少
mysql> flush privileges;
mysql> exit;

$ sudo service mysql restart  # 重启mysql服务

Step 3. 使用root登录

$ mysql -u root -p
Enter password:

mysql>

原文地址：https://www.cnblogs.com/ryuasuka/p/11162140.html