Linux deployment MySQL

mysql install

Deployment environment ：Linux centos 7.6

1. Online installation command
yum -y install mysql-server

2. Load Service Start the service
    /etc/rc.d/init.d/mysqld start perhaps service mysqld restart

3. Set up mysql The service starts automatically
chkconfig mysqld on

4. see mysql Startup and self startup settings
    chkconfig --list mysqld  
（mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off） ← If 2--5 by on The state of OK

5． View the current mysql Version information
    mysql --version

6. modify mysql Default encoding and sql Maximum length of statement execution
     perform vi /etc/my.cnf command
     stay [mysqld] Last addition ：
    default-character-set=utf8
character-set-server = utf8
init_connect='set names utf8'
max_allowed_packet = 50M
wait_timeout=27594000

restart mysql command ： service mysqld restart
Enter into mysql Check the timeout ：show global variables like 'wait_timeout';

7. Get into mysql View current code in
    mysql>show variables like '%character%';

8. Set access rights and passwords
    mysql> grant all privileges on *.* to 'root'@'%' identified by 'admin';  
mysql> grant all privileges on *.* to 'root'@'localhost' identified by 'admin';  
mysql> flush privileges;  

9. View the currently set access permission status
    mysql> select user,host,password  from mysql.user;

10. restart mysql service
    service mysqld restart perhaps /etc/init.d/mysqld restart 

11. Delete mysql( Execute again when there is an error in the installation )
    yum remove mysql mysql-server mysql-libs compat-mysql51  
rm -rf /var/lib/mysql  
rm /etc/my.cnf

12. See if it exists mysql( Execute again when there is an error in the installation )
    rpm -qa|grep mysql  // If there are any, please continue to delete  
rpm -ql mysql       // View file location

13. notes ： Restart the server ：reboot