ubuntu 安装 mysql 数据库

执行安装命令：

sudo apt install mysql-server
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使用命令登录 mysql:

mysql -u root
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报错信息：Mysql:ERROR 1698 (28000): Access denied for user 'root'@'localhost'

使用 cat 命令查看默认用户名密码：

sudo cat /etc/mysql/debian.cnf
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打印信息如下：

# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host     = localhost
user     = debian-sys-maint
password = 8W1mSxvxakfmBfe0
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = 8W1mSxvxakfmBfe0
socket   = /var/run/mysqld/mysqld.sock
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使用默认用户名密码登录：

panchao@panchao-GE62-6QF:~$ mysql -udebian-sys-maint -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 14
Server version: 5.7.24-0ubuntu0.18.04.1 (Ubuntu)

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> 
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修改 root 用户密码：

mysql> update mysql.user set authentication_string=password('123456'), plugin='mysql_native_password' where user='root';
mysql> flush privileges;
mysql> quit
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重新使用 root 用户登录：

panchao@panchao-GE62-6QF:~$ mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.7.24-0ubuntu0.18.04.1 (Ubuntu)

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> 
​

完成安装。