MySql installation based on CentOS6 (any host can log in to MySQL)

Installation package preparation

1. In order to ensure the purity of the system before installation, check whether mysql is installed. If it is installed, uninstall mysql and
   check: rpm -qa|grep mysql
   uninstall: rpm -e --nodeps {installation file found}
   
2. Download MySql related installation packages
   MySQL-server-5.6.40-1.el6.x86_64 and MySQL-client-5.6.40-1.el6.x86_64

Install MySql server

1. Install mysql server
   rpm -ivh MySQL-server-5.6.24-1.el6.x86_64.rpm
   
2. View the generated random password
   cat /root/.mysql_secret
   
3. View mysql status
   service mysql status
   
4. start mysql
   service mysql start

Install MySql client

1. Install mysql client
   rpm -ivh MySQL-client-5.6.24-1.el6.x86_64.rpm
   
2. link mysql
   mysql -uroot -pOEXaQuS8IWkG19Xs (random password seen above)
   
3. Modify password
   mysql>SET PASSWORD=PASSWORD('666666');
   
4. Exit mysql
   mysql>exit
   

Host configuration in the user table in MySql

As long as the configuration is root user + password, you can log in to the MySQL database on any host.

1. Enter mysql
   mysql -uroot -p666666
   
2. Show databases
   mysql>show databases;
   
3. Use mysql database
   mysql>use mysql;
   
4. Display all tables in the mysql database
   mysql>show tables;
   
5. Show the structure of the user table
   mysql>desc user;
   
6. Modify the user table and modify the content of the Host table to%
   mysql>update user set host='%' where host='localhost';
   
7. 删除root用户的其他host
   mysql>delete from user where Host='hadoop102 ';
   mysql>delete from user where  Host='127.0.0.1';
   mysql>delete from user where  Host='::1';
   
8. flush and launch
   mysql>flush privileges;
   mysql> quit;