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Nix notes |
© Võ Minh Thu, 2019. |
$ nix-build -A image
@result@
This derivation builds a virtual machine image suitable for Digital Ocean: one can import the resulting file as a custom image then select that image when creating a new droplet (a droplet is the name DO gives to a virtual machine). We'll do that in two commits (i.e. here).
As can be seen in default.nix, the Nix expression detailing our complete
image is quite simple: we call <nixpkgs>/nixos/lib/eval-config.nix, passing
two modules: one defined in nixpkgs containing the DO-specific bits, and
./configuration.nix.
Really, that's nixpkgs doing all the work!
Finally our ./configuration.nix is a standard NixOS configuration file, just
like the one you would have in /etc/nixos/configuration.nix. It imports
modules/nginx.nix which could alternatively be inlined in configuration.nix
since both are short, but doing so will be useful when we add more to our
configuration.