SSH: Difference between revisions

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== SSH ==


== SSH ==
SSH allows you to connect to a shell on a remote computer.


'''Example:'''
<code>[user@localhost ~]$ ssh username@yourserver</code>


SSH allows you to connect to a shell on a remote computer.


Use -p to set the port.


'''Example:'''
'''Example:'''
<code>[user@localhost ~]$ ssh -p 123 username@yourserver</code> - connects using port 123.


<code>[user@localhost ~]$ ssh username@yourserver</code>




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'''Example:'''
'''Example:'''


<code>[user@localhost ~]$ scp examplefile yourusername@yourserver:/home/yourusername/</code>
<code>scp examplefile yourusername@yourserver:/home/yourusername/</code>


This example sends '''examplefile''' from the directory you're currently in to '''/home/yourusername/''' on '''yourserver'''
This example sends '''examplefile''' from the directory you're currently in to '''/home/yourusername/''' on '''yourserver'''
Note that scp uses <code> -P </code> to specify the port.
To download a file from a remote server to your local computer:
<code>scp sshusername@10.10.10.123:/remote/file.txt /home/user/Downloads/</code>
== SSH Keys ==
ssh keys are used to connect to an ssh server without a password.
'''Step 1: Create a key-pair on the client machine'''
<code>ssh-keygen -t rsa</code>
After you enter the above command, ssh-keygen will ask you where you want to store the key. You can just press ENTER to accept the default location.
Next, it will ask you to enter a passphrase. You can either enter a passphrase, or press ENTER to not use a passphrase.
(Note that you don't need a pass-phrase, but if you don't use one, anyone that somehow gets a copy of the key can get into your server.)
SSH keygen will spit out a bunch of stuff, and you're done with step 1.
'''Step 2: Copy the public key to the server'''
<code>ssh-copy-id <i>user</i>@<i>server_IP</i></code>
This will copy the public key over to the server. Now try to connect via SSH, and it should connect without a password (unless you entered a pass-phrase. In that case, you need to enter the pass-phrase to connect.)


== References ==
== References ==

Latest revision as of 23:53, 2 November 2017

SSH

SSH allows you to connect to a shell on a remote computer.

Example: [user@localhost ~]$ ssh username@yourserver


Use -p to set the port.

Example: [user@localhost ~]$ ssh -p 123 username@yourserver - connects using port 123.


SCP

You can also use scp to securely transfer files.

Example:

scp examplefile yourusername@yourserver:/home/yourusername/

This example sends examplefile from the directory you're currently in to /home/yourusername/ on yourserver

Note that scp uses -P to specify the port.

To download a file from a remote server to your local computer:

scp sshusername@10.10.10.123:/remote/file.txt /home/user/Downloads/

SSH Keys

ssh keys are used to connect to an ssh server without a password.

Step 1: Create a key-pair on the client machine

ssh-keygen -t rsa

After you enter the above command, ssh-keygen will ask you where you want to store the key. You can just press ENTER to accept the default location.

Next, it will ask you to enter a passphrase. You can either enter a passphrase, or press ENTER to not use a passphrase. (Note that you don't need a pass-phrase, but if you don't use one, anyone that somehow gets a copy of the key can get into your server.)

SSH keygen will spit out a bunch of stuff, and you're done with step 1.


Step 2: Copy the public key to the server

ssh-copy-id user@server_IP

This will copy the public key over to the server. Now try to connect via SSH, and it should connect without a password (unless you entered a pass-phrase. In that case, you need to enter the pass-phrase to connect.)


References

  1. ssh man page