Enable SSH on Linux: Step-by-Step Guide

To enable SSH remote login on a Linux system, you need to follow these steps:

1. Make sure your Linux system has OpenSSH server installed. If not, use the following command to install OpenSSH server:

sudo apt-get install openssh-server (对于Ubuntu和Debian系统)
sudo yum install openssh-server (对于CentOS和RedHat系统)

1. Confirm that the SSH service has been started. Check the status of the SSH service using the following command:

sudo systemctl status sshd

1. If the SSH service is not running, use the following command to start the SSH service:

sudo systemctl start sshd

1. Enable the SSH service to start automatically. Set the SSH service to start on boot using the following command:

sudo systemctl enable sshd

1. Make sure that the firewall allows SSH connections. If you are using a firewall, ensure that port 22 (the default SSH port) is allowed for connection. You can add rules using the following commands.

sudo ufw allow ssh

1. Now, you can connect to your Linux system using an SSH client. Use the following command to connect to the Linux server:

ssh username@ip_address

username refers to the username on your Linux system, while ip_address refers to the IP address or hostname of your Linux system.

By following the above steps, you can successfully enable SSH remote login and connect to your Linux system.