SSH to a nixos test container

container_config.nix

# This gist pertains to entering test VMs within nixpkgs/nixos/tests
# They must be run with driverInteractive in order to keep them around
# Use this in your test VM node configuration to enable ssh and root login
{
      services.openssh = {
        enable = true;
        settings.PermitRootLogin = "yes";
      };
      # Password will be "testingpain"
      users.users.root.hashedPassword = "$6$LXJZIXCXOFNlhzc5$NYtb4ThIXAf4tcmIZB9D0b8r4Dj52JH0WU1ZwdVXdp0lQRZBU7I7dw.6ojLZY/bpxKTqYokIvqTZA.JGKXuVY/";
      users.users.root.hashedPasswordFile = null;
      users.mutableUsers = false;
      virtualisation.forwardPorts = [{ from = "host"; host.port = 2222; guest.port = 22; }];
}

ssh.sh

ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null root@localhost -p 2222