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Passwordless Login to CSIF

Setup passwordless login to CSIF using SSH Key Authentication and SSH Config.

Outcome:

  • Be able to connect to CSIF by simply using command ssh csif

What you need:

  • VS Code
  • VS Code Extension Remote - SSH

For Windows

  • Open Windows Powershell
  • Run command ssh-keygen
    • You don't need to (of course you can) change the default location or set a password for the key, so press enter directly when you see any prompts
    • This command generates a pair of public and private key used in SSH Key Authentication
  • Run command cat ~/.ssh/id_rsa.pub | ssh username@pcXX.cs.ucdavis.edu "cat >> ~/.ssh/authorized_keys"
    • You need to replace username and XX in the command
    • This command uploads the public key you just generated to a CSIF computer
  • Open VS Code and click the little green button in the bottom-left corner of the window
  • Select Remote-SSH: Open Configuration File... and choose the first option prompted
  • Replace the file content with the following and save it (of course, you need to replace username and XX too) 
    Host csif
    HostName pcXX.cs.ucdavis.edu
    User username
    IdentityFile ~/.ssh/id_rsa
  • Return to Windows PowerShell and run command ssh csif to connect to a CSIF computer passwordlessly
    • If you are still prompted for entering a password, your SSH Key Authentication is not set up correctly
    • You can connect to CSIF in this passwordless way on your computer from now on!

For macOS & Linux

  • Open Terminal
  • Run command ssh-keygen
    • You don't need to (of course you can) change the default location or set a password for the key, so press enter directly when you see any prompts
    • This command generates a pair of public and private key used in SSH Key Authentication
  • Run command ssh-copy-id username@pcXX.cs.ucdavis.edu
    • You need to replace username and XX in the command
    • This command uploads the public key you just generated to a CSIF computer
  • Open VS Code and click the little green button in the bottom-left corner of the window
  • Select Remote-SSH: Open Configuration File... and choose the first option prompted
  • Replace the file content with the following and save it (of course, you need to replace username and XX too) 
    Host csif
    HostName pcXX.cs.ucdavis.edu
    User username
    IdentityFile ~/.ssh/id_rsa
  • Return to Terminal and run command ssh csif to connect to a CSIF computer passwordlessly
    • If you are still prompted for entering a password, your SSH Key Authentication is not set up correctly
    • You can connect to CSIF in this passwordless way on your computer from now on!

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