{"id":46172,"date":"2024-04-14T14:01:27","date_gmt":"2024-04-14T14:01:27","guid":{"rendered":"https:\/\/ubuntuhandbook.org\/?p=46172"},"modified":"2024-04-14T14:01:27","modified_gmt":"2024-04-14T14:01:27","slug":"install-ssh-ubuntu-2404","status":"publish","type":"post","link":"https:\/\/ubuntuhandbook.org\/index.php\/2024\/04\/install-ssh-ubuntu-2404\/","title":{"rendered":"How to Install & Use SSH Service in Ubuntu 24.04"},"content":{"rendered":"

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This simple tutorial shows how to enable and setup Secure Shell (SSH) service in Ubuntu 24.04, so you can login remotely and transfer files securely in command console.<\/p>\n

Debian and Ubuntu use OpenSSH (OpenBSD Secure Shell) to provide secure shell channel for making changes, transferring data, and performing other operations on server from a client remotely.<\/p>\n

The SSH service is NOT enabled by default. And, here I’m going to how to enable and configure it in Ubuntu 24.04<\/p>\n

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Step 1: Install OpenSSH Server<\/h3>\n

First connect to your Ubuntu server, or press Ctrl+Alt+T<\/code> to open up a terminal window on Ubuntu Desktop.<\/p>\n

When terminal opens, run command to refresh system package cache:<\/p>\n

sudo apt update<\/pre>\n
Then, install the SSH server via command:<\/p>\n
sudo apt install ssh<\/pre>\n
For choice, you may use sudo apt install openssh-server<\/code> command that will do the same thing.<\/i><\/p>\n
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Step 2: Configure Listening Port, Authentication, etc<\/h3>\n
Since Ubuntu 22.10, OpenSSH is configured to use systemd socket activation by default. Meaning that the ssh service will be NOT started until an incoming connection is received.<\/p>\n
This can save at least 3MiB of memory, which is useful when running multiple Ubuntu instances in VMs or LXD containers.<\/p>\n
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Due to this change, Port<\/code> and ListenAddress<\/code> etc changes in \/etc\/ssh\/sshd_config<\/code> did NOT work. User had to either edit config files under \/etc\/systemd\/system\/ssh.socket.d<\/code> instead, or revert to the previous non-socket-activated behavior<\/a>.<\/p>\n
In Ubuntu 24.04, user again can edit the \/etc\/ssh\/sshd_config<\/code> file to configure SSH. The only change is re-starting the socket instead of ssh.service for applying changes.<\/b><\/p>\n
And, to edit the file, run command:<\/p>\n
sudo nano \/etc\/ssh\/sshd_config<\/pre>\n
When the file opens, remove “#” at the beginning for any line you want to enable, then change the value according to your need. For example:<\/p>\n