kubenix/docs/content/examples/image/image.nix

{ dockerTools, nginx }:
dockerTools.buildLayeredImage {
  name = "nginx";
  contents = [ nginx ];
  extraCommands = ''
    mkdir -p etc
    chmod u+w etc
    echo "nginx:x:1000:1000::/:" > etc/passwd
    echo "nginx:x:1000:nginx" > etc/group
  '';
  config = {
    Cmd = [ "nginx" "-c" "/etc/nginx/nginx.conf" ];
    ExposedPorts = {
      "80/tcp" = { };
    };
  };
}