How to Check Connection to a MySQL DB Server using the NC and Telnet Commands

Checking the connection to a MySQL database server is essential for ensuring that your applications can access the database as expected. In this guide, we’ll show you how to check the connection to a MySQL server using the nc (netcat) and telnet commands.

Step 1: Install the Required Tools

First, install the necessary tools on your system. If you don’t have nc (netcat) and telnet installed, you can install them using the following commands:

For nc (netcat):

sudo apt update
sudo apt install -y netcat

For telnet:

sudo apt update
sudo apt install -y telnet

Step 2: Check the Connection Using NC (Netcat)

To check the connection to a MySQL server using nc, run the following command:

nc -zv [mysql_server_ip] [mysql_port]

Replace [mysql_server_ip] with the IP address or domain name of your MySQL server and [mysql_port] with the MySQL server port (default is 3306). For example:

nc -zv 192.168.1.100 3306

If the connection is successful, you will see an output like this:

Connection to 192.168.1.100 3306 port [tcp/mysql] succeeded!

If the connection fails, you will see an output like this:

nc: connect to 192.168.1.100 port 3306 (tcp) failed: Connection refused

Step 3: Check the Connection Using Telnet

To check the connection to a MySQL server using telnet, run the following command:

telnet [mysql_server_ip] [mysql_port]

Replace [mysql_server_ip] and [mysql_port] as described in Step 2. For example:

telnet 192.168.1.100 3306

If the connection is successful, you will see an output like this:

Trying 192.168.1.100...
Connected to 192.168.1.100.
Escape character is '^]'.

If the connection fails, you will see an output like this:

Trying 192.168.1.100...
telnet: Unable to connect to remote host: Connection refused

To close the telnet session, press Ctrl + ] followed by q and Enter.

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Conclusion

You have now learned how to check the connection to a MySQL database server using nc (netcat) and telnet commands. These tools can help you diagnose connectivity issues between your applications and the MySQL server.

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