Config SSH file

Introduction

Hello everyone, today I would like to share about “How to config SSH file for naming server”. I hope my following guide will be helpful to everyone.

Problem

If you frequently work on Linux servers through SSH connections, you will find that remembering all the server IP addresses, different usernames, ports and various command line options is difficult, if not impossible.

Solution

Maybe, you’ll save these SSH commands in a file. When you need to use them, you can just copy and paste them to ssh into the server.

But today, I will share with you a much simpler and better way, which is to use ssh-config file.

Step by step

Step 1: Create config file

First of all, you copy and run the following command to create config file.

touch ~/.ssh/config

After creating the config file, you copy and run the following command to set the file permissions.

chmod 600 ~/.ssh/config

Step 2: Edit config file

The structure of the config file is as follows

Host    <host name alias>
        HostName    <ip/url host>
        User        <username>

Here’s an example

Host    server1
        HostName    10.0.0.1
        User        tuandata

Declare the information for each server one by one according to the template above, then save the file and run the following command to change the permissions of the config file

chmod 600 ~/.ssh/config

Step 3: Using config file

If you haven’t set up the SSH config file yet, you would run the following command to SSH into a server, right?

ssh username@hostname

Example

ssh tuandata@10.0.0.1

But after you have configured the SSH file, you only need to run the following command

ssh host_name_alias

Example

ssh server1

Very simple but very effective, right everyone?

Conclusion

I hope this explanation was clear and easy to understand for you to follow through the process.

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