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How to enable remote access to MySQL Database server

1. Connect to the machine with MySQL server (usually through SSH)
2. Find the main configuration file of the MySQL server - my.cnf:

  • Debian/Ubuntu - /etc/mysql/my.cnf
  • RedHat/CentOS/Fedora - /etc/my.cnf
  • FreeBSD - /var/db/mysql/my.cnf

3. Open this file (using admin rights) to edit it with any text editor (for example nano or vi/vim).
4. Go to MySQL daemon settings section (starts with [mysqld])
5. Comment or delete row with skip-networking.
6. Check and if needed update bind-address (default value - 127.0.0.1)

  • Change to the IP address of the main machine interface (you can find out the IP address using ip addr show or ifconfig request)

OR

  • set 0.0.0.0 - allows connecting from any address and machine interface

7. Save changes and reboot MySQL server:

  • Debian/Ubuntu: systemctl restart mysql OR /etc/init.d/mysql restart
  • RHEL/CentOS/Fedora: systemctl restart mysqld OR /etc/init.d/mysqld restart
  • FreeBSD: service mysql-server restart OR /usr/local/etc/rc.d/mysql-server restart

8. On the firewall (usually iptables), allow incoming connections via TCP port 3306 (MySQL) from our IP address - 94.130.206.204:

  • If the machine is available on the Internet (has a public IP address), please make the following request
    iptables -A INPUT -i eth0 -p tcp -s 94.130.206.204 --dport 3306 -j ACCEPT
  • If the machine is using NAT:
    1. Allow incoming connections on the machine with MySQL server using request:
      iptables -A INPUT -i eth0 -p tcp --dport 3306 -j ACCEPT
    2. Set up the ports redirection for your NAT (please check the documentation of your NAT)
eth0 is the name of the machine network interface (often: enp2s0)

9. Set up the connection to the necessary database:

  • Connect to MySQL server using admin credentials (by default it is - root) - mysql -u root -p
  • Create a new MySQL user and grant access to the needed database:
    • for full rights:
      mysql> GRANT ALL PRIVILEGES ON database.* TO ‘user’@’94.130.206.204’ IDENTIFIED BY ‘StrongPassword’;
    • for read-only rights
      mysql> GRANT SELECT, SHOW VIEW ON database.* TO ‘user’@’94.130.206.204’ IDENTIFIED BY ‘StrongPassword’;
  • database - database name to which you want to grant the access
  • user - username

The user will be created automatically by request:
GRANT SELECT, SHOW VIEW ON database.* TO ‘user’@’94.130.206.204’ IDENTIFIED BY ‘StrongPassword’;

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