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Basic management of mysql database in Linux system

2022-08-02 17:31:00 【linyxg】

MariaDB basic information

  1. Start service: systemctl start mariadb
  2. Default port number: 3306
  3. Main configuration file: vim /etc/my.cnf.d/mariadb-server.cnf
  4. Data directory: /var/lib/mysql (you need to clean this directory and backup when you need to reinstall mariadb)
  5. Service startup script: /usr/lib/system/mariadb.service

Installation of MariaDB database

MariaDB database management system is a fork of MySql which is designed to be fully compatible with MySql, including API and command line.

  • Install the database: dnf install mariadb-server.x86_64
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  • View the file of the mariadb installation package: rpm -ql mariadb-server
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  • Enable database: systemctl enable --now mariadb
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    • li>

Safe initialization of database

  1. For the database that has just been installed, you need to set the database password first
  • Initialization script: mysql_secure_installation
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  • Log in to the database: mysql -uusername -ppassword
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  1. Close the open port of the database
  • View the data port number: netstat -antlupe | grep mysql
    By default, the database opens the port to the outside world
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  • Edit the configuration file and close the port: vim /etc/my.cnf.d/mariadb-server.cnf
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  • Restart the mariadb service: systemctl restart mariadb.service

Basic management of the database

  • Part of the basic syntax
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Database Password Management

  1. Database password change: mysqladmin -uroot -pwestos password redhat
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  2. Database password cracking
    Close the database: systemctl stop mariadb
    Skip the authorization table to run the database: mysqld_safe --skip-grant-tables &
    Log in to the database: mysql -uroot -pwestos
    View aboutmysql process: ps -aux |grep mysql
    Kill process: kill -9 process number
    New password login: mysql -uroot -plyx
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User Management

  • New User
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  • Ordinary user authorization
    Super user login database: mysql -uroot -pwestos
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  • Test if authorization is successful
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  • Cancel authorization: revoke insert on database_name.* from [email protected]
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Database Backup and Restore

  • Database Backup
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  • Database Restoration
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  • Restore successfully
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https://yzsam.com/2022/214/202208021446320352.html

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