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I think I've always had a pleasant time upgrading my NixOS boxes. For my homelab servers

sudo nix-channel --add nixos
sudo nixos-rebuild switch --upgrade
sudo reboot

Has "just worked". Keeping most of my lab stuff in Nomad helps with this as well as there isn't much that will change at the OS level, mostly Nomad, Consul, and Vault.

Comment or reply by webmention.