Login with SSH via `cs01 - cs06.richmond.edu` with authorized_keys

You can use this guide to connect via ssh to cs01 - cs06.richmond.edu (the UR Computer Science Linux machines) without using a password, but instead use an authorized public/private key pair.

Note you only need to do this once.

Follow these steps to generate a ssh-key with ssh-keygen
- Open a terminal on your laptop and type
```
ssh-keygen -t rsa -b 4096
```
- Hit enter to each of the questions
- No, you do not need a passphrase
Follow these steps to copy your public key
- In the terminal type
```
cat .ssh/id_rsa.pub
```
- This will print out your public key, select and copy it from the terminal
- Make sure you copy the whole thing beginning with ssh-rsa ending with something like dbalash@m1-mcs-dbalash
Open a new terminal and login to cs01.richmond.edu via ssh.
- In the terminal type (but replace <YOUR UR LOGIN> with your university login, for example mine is dbalash )
```
ssh <YOUR UR LOGIN>@cs01.richmond.edu
```
- Enter your password when prompted. (Note: you will not see the password characters as you type them.)
- If you see a message like this
```
RSA key fingerprint is 96:a9:23:5c:cc:d1:0a:d4:70:22:93:e9:9e:1e:74:2f.
Are you sure you want to continue connecting (yes/no)? yes
```
- Type yes and hit return.
Change directory to the .ssh folder.
- In the new terminal type
```
 cd .ssh
```
- Note, if the above command does not work because there is no .ssh folder then run the following command to make the directory.
```
 mkdir .ssh
 cd .ssh
```
Edit or create the file authorized_keys to add your newly created public key to the file.
- In the terminal type
```
 nano authorized_keys
```
- Paste your public key into the file.
- Save and exit nano, by typing Ctrl-X, the type Y (for yes), and hit enter to accept the file name to save to is authorized_keys.
Logout of the cs01 terminal.
- In the cs01 terminal type
```
 exit
```

On your personal laptop edit the .ssh/config file.

In the terminal type
```
 nano .ssh/config
```
Note: if you are on a Windows PC and nano is not installed, you can try notepad.exe like this notepad.exe .ssh/config

Add the following lines to the file

  Host cs01
  HostName cs01.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host cs02
  HostName cs02.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host cs03
  HostName cs03.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host cs04
  HostName cs04.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host cs05
  HostName cs05.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host cs06
  HostName cs06.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

  Host turing2
  Hostname turing2.richmond.edu
  User urnetid
  IdentityFile ~/.ssh/id_rsa

Replace urnetid with your University of Richmond network id. For example, dbalash for me.
Save and exit nano, by typing Ctrl-X, the type Y (for yes), and hit enter to accept the file name to save to is ./ssh/config.

Connect again to the UR CS Linux machines.
- In a terminal type
```
 ssh cs01
```
Troubleshooting: if it did not work, you can try the following.
- Open a terminal on your laptop type the following to start the ssh-agent
```
  eval "$(ssh-agent -s)"
```
- then use the ssh-add command
```
  ssh-add .ssh/id_rsa
```

Login with SSH via cs01 - cs06.richmond.edu with authorized_keys

Login with SSH via `cs01 - cs06.richmond.edu` with authorized_keys