NixOS

Update Image

• From a newly created NixOS instance:

 sudo nix-channel --update

• Inspect/edit /etc/nixos/configuration.nix

 sudo nixos-rebuild switch
 sudo reboot # and then confirm working
 nix-collect-garbage -d && sudo nix-collect-garbage -d 
 sudo reboot # and then confirm working

• Change nixos password (passwd) and confirm nothing funny in /etc/shadow!!!
• Update nixos user password in Shared-CornellCAC last pass vault
• Confirm you can't ssh or login as root without a password
• Further cleanup:

 sudo rm -fr /var/lib/cloud/
 rm /home/nixos/.bash_history

• From OpenStack:

 1. Shut off instance
 2. Create snapshot

• Work in progress

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 3. Rename old Image (snapshot) to NixOS-Old
 4. Name new image (snapshot) NixOS; Edit imate: Make sure Protected/Sharing is set to Yes. update metadata as necessary (may need to delete base_image_ref as it is empty). 
 5. Test that new image works by creating and testing an instance.
 6. Verify image is seen between projects (how)?