Secure Shell (SSH) is an Internet communication protocol used to exchange data between two computers using a secure channel.
Members can access their LUG account remotely via SSH.
Connecting to LUG servers
Note: in the following examples, remember to replace "user" with your actual LUG username.
From the terminal
To initiate a normal SSH session from your laptop:
$ ssh firstname.lastname@example.org
or if you want X11 forwarding (to run graphical applications such as QtOctave):
$ ssh -X email@example.com $ qtoctave
To transfer files and directories, use Secure Copy:
scp <from> <to>.
scp from remote to local (i.e. server to laptop):
$ scp firstname.lastname@example.org:~/homework1.txt ~/Documents $ ls ~/Documents ... homework1.txt ...
scp from local to remote (i.e. laptop to server):
$ scp ~/Documents/lug.jpg email@example.com:~/ $ ssh firstname.lastname@example.org ls ~/ ... lug.jpg ...
To change your LUG password, ssh into the server and run kpasswd:
$ ssh email@example.com $ kpasswd
man ssh or
man scp to see the complete manuals for these tools.
From the GUI
|KDE (Linux)||GNOME (Linux)||Windows||Mac|
Using SSH keys
Instead of using a password, you can use SSH keys to authenticate with your account.
Run the following interactive command to generate an SSH key pair:
$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/user/.ssh/id_rsa): <just hit enter> Enter passphrase (empty for no passphrase): <use a non-empty passphrase> Enter same passphrase again: Your identification has been saved in /home/user/.ssh/id_rsa. Your public key has been saved in /home/user/.ssh/id_rsa.pub. The key fingerprint is: 7a:15:03:8c:e6:0e:ae:06:c2:e1:8d:0a:11:b6:7e:5e user@hostname The key's randomart image is: +--[ RSA 2048]----+ | o. | |.. o .. | |... o o | |.o . . o | |+.+. o S . | |+= o.E.. . | |+.o.. . . | |. o. . | | . | +-----------------+
Note: generate your SSH keys on your personal computer. Your private key does not belong to anybody but yourself.
Now you should have two keys: a public key at
~/.ssh/id_rsa.pub and a corresponding private key at
~/.ssh/id_rsa. Do not share your private key with anybody. Your public key can be copied to any remote account that supports SSH and you will be able to use your private key to authenticate with it.
E.g. copy your public key to your LUG@UCLA account:
$ ssh-copy-id firstname.lastname@example.org
ssh-agent so you don't have to type your passphrase every time you use your private key. In most modern desktop environments (e.g. GNOME, KDE) this is handled in a GUI pop-up when you first use your private key.
man ssh-copy-id, or
man ssh-agent to see the complete manuals for these tools.
The LUG@UCLA SSH endpoint has the following software installed:
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