Ubuntu – How to set up a server for SSH

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At my workplace (a university) we have two Ubuntu servers. One is a teacher server and the other is a student server. I am currently setting up a new server to replace the existing teacher server.

The new server is currently online and I am trying to get it setup so I can SSH into it from my home. Right now, I can SSH into the existing teacher or student server and then SSH into the new server. However, I can not SSH directly into the new server.

What must I do so that I can SSH directly into the new server?

Thank you very much in advance for your time.

Best Answer

If you already have ssh installed on the server and you can't connect from your home, probably you'll have to forward port 22 (or whatever port ssh is using) on the router.

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Ubuntu – How to delete useless ssh key on the server(Ubuntu server 16.04) and generate new one

The key will be in ~/.ssh/authorized_keys

You can delete the line for the old key with the editor of your choice.

You can generate a new private key by running the following command on a client machine.

ssh-keygen

Depending on which algorithm was used add the contents of the ~/.ssh/id*.pub file to the ~/.authorized_keys file on the server. It will be a single line

It is probably called:

id_rsa.pub

And the key will look like

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAIZ5CYnbANePH8y1rKvFIpWNWrr3kSuelNP61W/yPiPtf11DZgdWsP5eaBQQqEZpXnw57pu5SuPHe5FPn+L39c/xtPJdvn1ZSVo1OTWMPkKGX+5WuL5ypaHN5J2E4qkZD9vzQ4OcUGGdODZ676TPV5cAD7oYHvBWKdCxPUztUAAAADAQABAAIZ5CYnbANePH8y1rKvFIpWNWrr3kSuelNP6 user@foo

Note that it is a single line. If you delete the authorized_keys file on the server you will need to make sure the permissions are correct.

chmod 0644 ~/.ssh/authorized_keys

Best Answer

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Ubuntu – How to delete useless ssh key on the server(Ubuntu server 16.04) and generate new one

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