Ubuntu system installation and MySQL configuration

One 、 install MySQL

1. install mysql service

sudo apt-get update

sudo apt install mysql-server-5.7

2. mysql edition

mysql -V

 3. see MySQL Default account and password

sudo cat /etc/mysql/debian.cnf

Two 、 To configure MySQL

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 

#2
 Please set the password for root here...
 New password: ( Input password )
Re-enter new password: ( Repeat input )

#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 

#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 

#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 

#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 

3、 ... and 、 see mysql Service status

systemctl status mysql.service

 ps -ef|grep mysqld

Four 、 modify root Account secret authentication method

sudo cat /etc/mysql/debian.cnf

password The next is the password

Then type on the command line ：

mysql -u debian-sys-maint -p

• In the presence of Enter password Enter the password above , Get into mysql Command mode
• Create database , Change Password

use mysql;

update mysql.user set authentication_string=('password') where user='root' and Host ='localhost';
update user set plugin="mysql_native_password"; 
flush privileges;
quit;

5、 ... and 、 Configure remote access mysql

1. Modify the configuration file , Comment out bind-address = 127.0.0.1

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

2. Save and exit , Get into mysql

mysql -uroot -p

mysql> use mysql;
mysql> update user set host='%' where user = 'root';
mysql> flush privileges;

restart

sudo service mysql restart

Check the status

systemctl status mysql.service

6、 ... and 、 Delete MySQL

Delete mysql:

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

Clean up residual data

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