Set up nginx-proxy

etc/nixos/configuration.nix

@@ -12,6 +12,15 @@
     # useDHCP is deprecated
     useDHCP = false;
     interfaces.eth0.useDHCP = true;
+
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [
+        80
+        443
+        2222
+      ];
+    };
   };
 
   time.timeZone = "Europe/London";
@@ -48,5 +57,47 @@
     };
   };
 
+  virtualisation.docker = {
+    enable = true;
+    autoPrune.enable = true;
+  };
+
+  docker-containers = {
+    nginx-proxy = {
+      image = "jwilder/nginx-proxy:alpine";
+      ports = [
+        "80:80"
+        "443:443"
+      ];
+      volumes = [
+        # So that we can watch new containers come up
+        "/var/run/docker.sock:/tmp/docker.sock:ro"
+        # So that we can access generated certs
+        "nginx-certs:/etc/nginx/certs:ro"
+        # So that we can write challenge files for letsencrypt auth
+        "nginx-challenges:/usr/share/nginx/html"
+        # So that we can modify config on-the-fly to set up challenge
+        # files
+        "nginx-conf:/etc/nginx/vhost.d"
+      ];
+      environment = {
+        DHPARAM_GENERATION = "false"; # Provided by nginx-proxy-letsencrypt
+      };
+    };
+
+    nginx-proxy-letsencrypt = {
+      image = "jrcs/letsencrypt-nginx-proxy-companion";
+      volumes = [
+        "/var/run/docker.sock:/var/run/dokcer.sock:ro"
+        "nginx-certs:/etc/nginx/certs"
+        "nginx-challenges:/usr/share/nginx/html"
+        "nginx-conf:/etc/nginx/vhost.d"
+      ];
+      environment = {
+        DEFAULT_EMAIL = "tm@tlater.net";
+      };
+    };
+  };
+
   system.stateVersion = "19.09";
 }