Systemd backend or "using NixOps to manage Ubuntu"

Development Deployments
4

I was able to reduce the hackery to the following. It only needs a modified ./switch-to-configuration with these sections commented out:

@@ -35,8 +35,8 @@
@@ -51,17 +51,17 @@
@@ -309,47 +309,47 @@
@@ -371,7 +371,7 @@
@@ -401,10 +401,10 @@
@@ -413,17 +413,17 @@

Remaining modifications are to forcibly clear out some elements of system.activationScripts.

The following can be used by NixOps after some minimal prep on the Ubuntu machine

  • Install Nix
  • .bashrc add to PATH /nix/var/nix/profiles/default/bin
  • .bashrc add to PATH /nix/var/nix/profiles/system/sw/bin
  • groupadd keys
  ubuntu = {config,pkgs,...}:{
    deployment.targetHost = "192.168.99.111";
    deployment.hasFastConnection = true;
    imports = [ <nixpkgs/nixos/modules/profiles/minimal.nix> ];
    boot.isContainer = true;
    fileSystems."/".device = "/dev/sda1";
    environment.systemPackages = [ pkgs.vim pkgs.coreutils pkgs.nettools];
    
    services.nginx = {
      enable = true;
      virtualHosts = {
        testing = {
          listen = [
            {addr = "127.0.0.1"; port = 80; ssl = false;}
          ];
          default = true;
          locations."/" = {
            root = "/srv";
          };
        };
      };
    };
    system.extraSystemBuilderCmds = ''
      substituteAll ${./switch-to-configuration} $out/bin/switch-to-configuration
      chmod +x $out/bin/switch-to-configuration
    '';
    system.activationScripts = {
      resolvconf = lib.mkForce "";
      users = lib.mkForce "";
      nginx = {
        text = ''
          /usr/sbin/useradd nginx || true
          /usr/sbin/groupadd nginx || true
          /usr/bin/rsync -av /nix/var/nix/profiles/system/etc/systemd/system/nginx.service /etc/systemd/system/nginx.service
          /bin/systemctl start nginx.service
        '';
        deps = [ ];
      };
    };
  };
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