sudo apt-get update

sudo apt install mysql-server-5.7

sudo apt install net-tools
sudo netstat -tap | grep mysql

mysql -V

sudo cat /etc/mysql/debian.cnf

sudo mysql_secure_installation

#1
VALIDATE PASSWORD PLUGIN can be used to test passwords...
Press y|Y for Yes, any other key for No: N (我的選項(xiàng))

#2
 Please set the password for root here...
 New password: (輸入密碼)
Re-enter new password: (重復(fù)輸入)

#3
 By default, a MySQL installation has an anonymous user,
 allowing anyone to log into MySQL without having to have
 a user account created for them...
 Remove anonymous users? (Press y|Y for Yes, any other key for No) : N (我的選項(xiàng))

#4
 Normally, root should only be allowed to connect from
 'localhost'. This ensures that someone cannot guess at
 the root password from the network...
 Disallow root login remotely? (Press y|Y for Yes, any other key for No) : N (我的選項(xiàng))

#5
 By default, MySQL comes with a database named 'test' that
 anyone can access...
 Remove test database and access to it? (Press y|Y for Yes, any other key for No) : N (我的選項(xiàng))

#6
 Reloading the privilege tables will ensure that all changes
 made so far will take effect immediately.
 Reload privilege tables now? (Press y|Y for Yes, any other key for No) : Y (我的選項(xiàng))

systemctl status mysql.service

sudo mysql -uroot -p

mysql> select user, plugin from mysql.user;

mysql> update mysql.user set authentication_string=PASSWORD('123456'), plugin='mysql_native_password' where user='root';
mysql>flush privileges;
mysql> exit

sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

mysql -uroot -p

mysql>grant all ON *.* to root@'%' identified by '123456' with grant option;
 Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
 Query OK, 0 rows affected (0.00 sec)
mysql> exit
 Bye

sudo /etc/init.d/mysql restart

sudo apt autoremove --purge mysql-server-*
sudo apt remove mysql-server
sudo apt autoremove mysql-server
sudo apt remove mysql-common

dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

sudo apt update
sudo apt install mysql-workbench