The video explain how to setup SSH on Ubuntu Server. SSH is a secure remote and file transfer because data will encrypt before it sent to remote.
In this tutorial, you will learn how to configure the firewall with UFW on Ubuntu Linux 20.04 LTS server or desktop to protect system from attacks. In this video I go in to detail about how to use and configure Putty. We also add a banner display to SSH login, and learn how to create and login using SSH keys. Putty Download link - https. This article explains how to generate SSH keys on Ubuntu 20.04 systems. We'll also show you how to set up an SSH key-based authentication and connect to remote Linux servers without entering a. This quick tip shows how to enable Secure Shell (SSH) service in Ubuntu 20.04 LTS, both desktop and server, to allow secure remote login and other network communications. Ubuntu includes OpenSSH, a.
This brief tutorial shows students and new users how to use the ssh command in Ubuntu to connect to establish secure communication to a remote system over SSH protocol.
Secure Shell (SSH) is a cryptographic network protocol that provides encrypted compunction between and clients and servers. It replaces previously unsecured network clients in a networked environment.
If you’re a student or new user looking for a Linux system to start learning on, the easiest place to start is Ubuntu Linux OS…. It’s a great Linux operating system for beginners and folks looking for easier Linux distribution to use.
Ubuntu is an open source Linux operating systems that runs on desktops, laptops, server and other devices…
When using Ubuntu, you will find that Linux isn’t so different than Windows and other operating systems in so many ways, especially when it comes to using the system to get work done.
Both Ubuntu and Windows systems allow you to be productive, easy to use, reliable and enable you to install and run thousands of programs from gaming to productivity suite software for individuals and businesses.
This tutorial is going to show you how.
When you’re ready to learn how to use the ssh commands, follow the guide below:
About ssh command:
Secure Shell (SSH) is a cryptographic network protocol that provides encrypted compunction between and clients and servers. It replaces previously unsecured network clients in a networked environment.
There are multiple SSH clients both commercial and opensource. OpenSSH client is the most popular SSH client and comes preinstalled on most Linux distributions by default.
Syntax:
Syntax is the rule and format of how the ssh command can be used… These syntax options can be reordered, but a straight format must be followed.
If you haven’t installed SSH server, the commands below will install it on the server. Run the commands below to install openssh-server.
Below is an example syntax of how to use the ssh command.
ssh [OPTIONS] [USER@]:HOST
Options:
The command line options are switches or flags that determined how the commands are executed or controlled… they modify the behavior of the commands… they are separated by spaces and followed after the commands…
Below are some options of the ssh command:
To connect to a remote server using SSH, the following must be met:
- An SSH server must be running on the remote machine.
- The SSH port must be open in the remote machine firewall.
- You must know the username and the password of the remote account. The account needs to have proper privileges for remote login.
If the above can’t be met, the connection to the remote machine will be established.
For example, to connect to a remote client by its hostname, you’ll use the commands below:
ssh example.com
If this is the first time you’re connecting to the remote host, you’ll get a similar message as below:
You must accept before connection will be established
Type yes to connect..
Each host stores a unique fingerprint of computer they connect to…
To establish connection using a different username, you can use the command below:
Example:
ssh username@example.com
or
ssh -l username example.com
If you do not specify a username when using the ssh command, the command automatically uses the logged in username for the connection..
Setup Ssh On Ubuntu 20.04
By default, if you do not specify a port when using the ssh command, it will try connecting to its default communication port 22.
To specify a different and unique port, use the commands below:
Example:
ssh -p 1234 username@example.com
Assuming port 1234 is opened on your firewall, connection will be established over the given port..
To specify a different port number on the SSH server, open its configuration file ( /etc/ssh/sshd_config ) and edit the highlighted line:
Save the file and restart the SSH server..
Many other server settings can be configured to establish even more secured connection..
For example, you can enable Public Key Authentication where cryptographic keys are generated to use for authentication instead of password.. The client generates a key pair, sends its public key to the server to store for future authentication..
To enable this, open the server configure file /etc/ssh/sshd_config
Then enable the lines below and save.
Save the file and exit
Restart SSH server:
sudo systemctl restart ssh
On the client computer, you can use the commands below to generate a key pair..
ssh-keygen -t rsa -b 4096 -C 'admin@example.com'
You’ll be prompted to type a passphrase.. it’s up to use whether you want to use a passphrase.. In most cases, you won’t want to use it.
Config Ssh Ubuntu 20.04
Once a key pair is generated on the client computer, you can use the commands below to export the client public key to the server.. This ensures that client and server to establish key authentication.
ssh-copy-id username@example.com
Enter the remote user password, and the public key will be appended to the remote user authorized_keys file..
You’ll want to make sure the client public key is in the server authorized_keys file before turning on key-based authentication.
With SSH, you can also use local and remote port forwarding.. Local port forwarding is where a SSH client connection is forwarded to a SSH host, before forwarding to a destination..
Remote port forwarding is the opposite of local port forwarding..
That’s it!
Conclusion:
This post shows you how to use the ssh command on Ubuntu to securely establish secure Secure Shell (SSH) communication to a remote host computer.
If you find any error above, please comment below to alert us..
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SSH, also known as Secure Socket Shell or Secure Shell, is a cryptographic protocol that helps to encrypt communication in unsecured networks where an SSHD is the daemon program for SSH. Together they provide secure communication between two untrusted hosts over an insecure network.
Step 1 : To install it in Ubuntu, use the following command:
Step 2 : You may check its status by running command:
Step 3 : We’re going to edit a /etc/ssh/sshd_config file using the vi editor as the root user, so you should type the following command on the terminal:
Step 4 : Look for a line that contains PermitRootLogin and replace it with the following line:
Step 5 : Save the /etc/ssh/sshd_config file
Step 6 : Now it’s time to restart the SSH server. Then your server will be installed, configured, and ready to use. You can test this by executing the following command:
Step 7 : You can test your SSH server by trying to connect to it and typing on the terminal the following command:
Step 8 : Now you will see a message asking for your authorization. Type yes and your password. You’re now connected to your our server through the SSH protocol.
Simplifying SSH connections with a config file
Step 1 : A local configuration must be stored in the .ssh directory of your home directory, and be named config. The full path would look something like this:
Ubuntu 20.04 Setup Ssh
Step 2 : This file doesn’t exist by default, but if it’s found, SSH will parse it and you’ll be able to benefit from it. Go ahead and open this file in your text editor, such as nano:
Step 3 : This config file allows you to type configuration for servers that you connect to often, which can simplify the SSH command automatically, for example:
Ubuntu Setup Ssh Key
Step 4 : SSH connections with a config file