By default you are not able to SSH into an Ubuntu 16.04\u00a0 machine and this blog post describes the steps needed to install SSH server.<\/p>\n
<\/p>\n
To enable logging in from another computer via SSH you need to install a SSH\u00a0server. To do this you\u00a0can run the following command. This will\u00a0install the OpenSSH\u00a0server for Ubuntu.<\/p>\n
sudo apt-get install openssh-server<\/pre>\nOnce this has installed the OpenSSH server will have been configured and started. At this point you can start using SSH on the machine. By default this will be configured for the default port (22) and will be started each time the machine starts.<\/p>\n
Configuring SSH via the config file<\/h2>\n
The SSH server can be configured by editing its configuration file located at:<\/p>\n
\/etc\/ssh\/sshd_config<\/pre>\nOne of the ways you can improve the security of your server is changing the port SSH runs on. This can be changed by setting the
Port<\/code>\u00a0setting. If you are changing this it is recommended to set it to a random unusued\u00a0port above 1024. Doing this doesn’t\u00a0limit who can access it or provide any inherent security. However most hacking\/scanning attempts will automatically try the default port and not try any others.<\/p>\nAnother improvement you can make is by disabling SSH via password login. This can be changed with the following SSHD config.<\/p>\n
PasswordAuthentication no<\/pre>\nSetting
PasswordAuthentication<\/code> to no would only allow login via private key and other more secure authentication methods. It is recommended to only set this up if you have created a private key and verified it works.<\/p>\nOnce this has been modified you will need to restart the SSH server for changes to be applied.<\/p>\n
How to restart the OpenSSH Server<\/h2>\n
Any time the configuration server has been modified you will need to restart the SSH server to reload the configuration.\u00a0 This can easily be done by running the following command.<\/p>\n
sudo systemctl\u00a0restart sshd<\/pre>\nOnce this has been done any changes to the configuration file will be loaded and applied.<\/p>\n","protected":false},"excerpt":{"rendered":"
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This means if you want to SSH into your\u2026","rel":"","context":"In "Informational"","block_context":{"text":"Informational","link":"https:\/\/chewett.co.uk\/blog\/category\/informational\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/10\/enabling_ssh_ubuntu.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/10\/enabling_ssh_ubuntu.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/10\/enabling_ssh_ubuntu.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/10\/enabling_ssh_ubuntu.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2535,"url":"https:\/\/chewett.co.uk\/blog\/2535\/fixing-ssh-keygen-unknown-option-g-or-t-on-ubuntu-20-04\/","url_meta":{"origin":831,"position":1},"title":"Fixing ssh-keygen Unknown Option -G or -T on Ubuntu 20.04","author":"Chewett","date":"July 4, 2020","format":false,"excerpt":"This blog post talks about how you can resolve the problem \"ssh-keygen Unknown Option -G\" on Ubuntu 20.04. 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