Ubuntu Linux OpenSSH Server installation and configuration

To install and configure the OpenSSH server on an Ubuntu Linux system, follow these steps:

1. Install OpenSSH:

To install the OpenSSH server, use the apt-get command. First, update the package index by running the following command:

sudo apt-get update

Then, install the OpenSSH server by running the following command:

sudo apt-get install openssh-server

This will install the OpenSSH server and any dependencies it requires.

2. Configure OpenSSH:

The OpenSSH server is configured using the /etc/ssh/sshd_config file. You can edit this file to specify options such as the port number that the OpenSSH server listens on, or the authentication methods that are allowed.

For example, to change the port number that the OpenSSH server listens on, you can add or modify the following line in the /etc/ssh/sshd_config file:

Port 22

To enable password authentication, you can add or modify the following line:

PasswordAuthentication yes

Keep in mind that it is recommended to use strong, unique passwords for all user accounts.

3. Restart the OpenSSH server:

After making any changes to the /etc/ssh/sshd_config file, you will need to restart the OpenSSH server for the changes to take effect. To do this, use the systemctl command:

sudo systemctl restart ssh

4. Test the OpenSSH server:

To test the OpenSSH server, you can use the ssh command to connect to the server from another machine. For example:

ssh user@server

Replace user with the username of an account on the server, and server with the hostname or IP address of the server.

If the OpenSSH server is configured and running correctly, you should be prompted to enter the password for the user account.

For more information on installing and configuring the OpenSSH server on Ubuntu Linux, you can refer to the OpenSSH documentation or the Ubuntu documentation.