Secure Shell, commonly known as SSH, is a cryptographic network protocol that enables secure communication between two networked devices. It provides a secure and encrypted connection over the internet or network, and is widely used for remote login, file transfer, and other network services.
In this article, we will discuss how to use SSH in Ubuntu, a popular Linux distribution, to securely connect to remote servers and perform various tasks.
Getting Started with SSH
Before we begin, ensure that you have Ubuntu installed on your system and a remote server to connect to. Also, make sure that you have the SSH client and server packages installed on your Ubuntu system. To install them, open the terminal and run the following commands:
sudo apt-get update
sudo apt-get install openssh-client openssh-server
Once you have installed the packages, you can use SSH to securely connect to remote servers.
Connecting to a Remote Server using SSH
To connect to a remote server using SSH, you need to know its IP address and the username and password for the account you wish to use. To establish a connection, open the terminal and type the following command:
ssh username@remote_server_ip
Replace username with the username of the account on the remote server and remote_server_ip with the IP address or domain name of the remote server. You will be prompted to enter the password for the account. Once you have entered the correct password, you will be connected to the remote server.
Working with SSH
Once you are connected to the remote server using SSH, you can perform various tasks such as copying files, running commands, and managing services. Here are some examples:
Copying files using SCP:
SCP (Secure Copy) is a command-line tool used to copy files securely between two networked devices. To copy a file from your local system to the remote server, use the following command:
scp /path/to/local/file username@remote_server_ip:/path/to/remote/directory
Replace /path/to/local/file with the path of the file you wish to copy, username with the username of the account on the remote server, remote_server_ip with the IP address or domain name of the remote server, and /path/to/remote/directory with the path of the directory on the remote server where you wish to copy the file.
Running commands remotely:
You can run commands remotely on the remote server using SSH. To do this, simply type the command you wish to run after connecting to the remote server using SSH. For example:
ssh username@remote_server_ip ls
This will run the ls command on the remote server and display the list of files and directories in the current directory.
Managing services:
You can also use SSH to manage services on the remote server. To start, stop, or restart a service, use the following commands:
sudo systemctl start service_name
sudo systemctl stop service_name
sudo systemctl restart service_name
Replace service_name with the name of the service you wish to manage.
SSH is a powerful tool that enables secure communication between two networked devices. In this article, we discussed how to use SSH in Ubuntu to connect to remote servers and perform various tasks. By following the instructions outlined in this article, you can use SSH to securely manage your remote servers.
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That's it for this post. Keep practicing and have fun. Leave your comments if any.