Linux Installation and uninstallation of MySQL

1、 uninstall

• because Linux By default, the system does not MySql, So we just use it without uninstalling .

• If you need to uninstall , The steps are like uninstalling JDK equally ： Linux Install and uninstall JDK_ rice * The blog of -CSDN Blog

• Just execute rpm -qa|grep mysql command , Then follow uninstall JDK Just follow the same steps .

2、 install

Log on first ROOT account number ！！！

1、 download MySql Official YumRepository

1. Carry out orders wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm Remote download MySql5.7 edition , need Linux Connected to the Internet

   

2. If the error is not reported wget, Then execute the command yum -y install wget

2、Yum install

1. Carry out orders yum -y install mysql57-community-release-el7-10.noarch.rpm

   

3、 install MySql The server

1. Carry out orders yum -y install mysql-community-server

2. If you make a mistake

   

3. Carry out orders rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

4. Execute command again yum -y install mysql-community-server That's all right.

   

4、 start-up MySql service

1. Carry out orders systemctl start mysqld.service

2. Need to wait a little

   

5、 see MySql Start state

1. Carry out orders systemctl status mysqld.service, You can see that it is running

   

6、 Find the password in the log

1. Carry out orders grep "password" /var/log/mysqld.log

   

7、 Sign in MySql

1. Log in to the database , Enter the command mysql –uroot -p

2. After typing the command , Enter the password you found above , Just copy and paste

   

8、 Change Password

1. Change Password , Enter the command set password for [email protected] = password('123_abC321'); Passwords include case and special characters , Otherwise, it will not succeed ( You can modify the password policy to set )

   

9、 Open permission

1. Enter the command GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'Yc17630620280.';

   

10、 Refresh the permissions

1. Carry out orders flush privileges;

   

11、 to open up 3306 port

1. Enter the command first exit, sign out MySql

   

2. Carry out orders firewall-cmd --zone=public --add-port=3306/tcp

   

12、 service iptables restart

1. Carry out orders firewall-cmd –-reload

   

13、Navicat Connect the test

1. Enter the command ip addr, View your own system ip Address

   

2. return Windows System , open Navicat Carry out connection test

   

3. If the above error is reported , You need to clear the rules in the chain in the firewall , Execute the following two commands respectively ：

   iptables -vnL
   iptables -F
   

   

14、 modify MySql Character encoding

1. Enter the first MySql, Enter the command mysql -uroot -p, Then enter the password

   

2. Display original code , Enter the command show variables like '%character%';

   

3. Use exit; Command exit mysql, And then modify /etc/my.cnf The configuration file

4. after , Enter the command vim /etc/my.cnf

5. Add two new lines , After entering, press i Editing

   [mysqld]
   character_set_server=utf8
   init_connect='SET NAMES utf8'
   

   

6. When I'm done , Press esc Press to exit the edit page , Then input :wq Save and exit

7. After exiting , Restart the database , Enter the command systemctl restart mysqld

8. Use navicat Perform the connection test again

   

This is the place ,Linux System installation MySql Task to complete ！