ubuntu安装mysql没有让我设置密码
终端输入： sudo cat /etc/mysql/debian.cnf
显示内容：
Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host = localhost
user = debian-sys-maint
password = PGBiNPneSGXRlayQ
socket = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host = localhost
user = debian-sys-maint
password = PGBiNPneSGXRlayQ
socket = /var/run/mysqld/mysqld.sock
其中有user和password可以用来登录，登录后再修改密码；
终端输入：mysql -u debian-sys-maint -p ，再输入密码后，进入ｍｙｓｑｌ中
mysql>
在mysql客户端中输入依次输入以下内容：
mysql> show databases;
mysql> use mysql;
mysql> update user set authentication_string=PASSWORD("root") where user="root";
mysql> update user set plugin="mysql_native_password";
mysql> flush privileges;
mysql> quit;
其中PASSWORD后面的root可以为其他自定义的密码，
在终端中输入 sudo /etc/init.d/mysql restart; 命令，重启ｍｙｓｑｌ服务
使用新密码登录ｍｙｓｑｌ：mysql -u root -p
卸载ｍｙｓｑｌ的命令：
sudo apt purge mysql-*
sudo rm -rf /etc/mysql/ /var/lib/mysql
sudo apt autoremove
安装ｍｙｓｑｌ的命令
sudo apt-get install mysql-client mysql-server
查看mysql状态
sudo service mysql status
查看mysql服务器端口
sudo netstat -tap |grep mysql
开启、停止和重启mysql服务
sudo service mysql start
sudo service mysql stop
sudo service mysql restart
转自：https://blog.csdn.net/shihuangdeng898/article/details/84147270
