From 4d16e394560c64f2aa9a26f2b18d4b31009f86fc Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Tue, 2 Nov 2021 11:49:28 +0100
Subject: [PATCH] Make a Consul+Nomad cluster

---
 configuration.nix | 48 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/configuration.nix b/configuration.nix
index f25efc7..6dcf30e 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -2,8 +2,11 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, ... }:
+{ config, pkgs, ... } @ args:
 
+# Configuration local for this cluster node (hostname, IP, etc)
+let node_config = import ./node.nix args;
+in
 {
   imports =
     [ # Include the results of the hardware scan.
@@ -115,16 +118,53 @@
   # };
 
   # List services that you want to enable:
-  
+
   # Enable network time
   services.ntp.enable = true;
 
   # Enable the OpenSSH daemon.
   services.openssh.enable = true;
 
+  # Enable Hashicorp Consul & Nomad
+  services.consul.enable = true;
+  services.consul.extraConfig =
+    let public_ip = (builtins.head node_config.networking.interfaces.eno1.ipv4.addresses).address;
+    in
+  {
+    datacenter = "neptune";
+    bootstrap_expect = 3;
+    server = true;
+    ui = true;
+    bind_addr = public_ip;
+    addresses.http = "0.0.0.0";
+    retry_join = [ "192.168.1.21" "192.168.1.22" "192.168.1.23" ];
+  };
+
+  services.nomad.enable = true;
+  services.nomad.settings =
+    let public_ip = (builtins.head node_config.networking.interfaces.eno1.ipv4.addresses).address;
+    in
+  {
+    datacenter = "neptune";
+    server = {
+      enabled = true;
+      bootstrap_expect = 3;
+    };
+    advertise = {
+      rpc = public_ip;
+      http = public_ip;
+      serf = public_ip;
+    };
+    consul.address = "127.0.0.1:8500";
+    client = {
+      enabled = true;
+      network_interface = "eno1";
+    };
+  };
+
   # Open ports in the firewall.
-  networking.firewall.allowedTCPPorts = [ 22 ];
-  # networking.firewall.allowedUDPPorts = [ ... ];
+  networking.firewall.allowedTCPPorts = [ 22 4646 4647 4648 8500 8300 8301 8302 ];
+  networking.firewall.allowedUDPPorts = [ 4648 8301 8302 ];
   # Or disable the firewall altogether.
   # networking.firewall.enable = false;