Force hydra to use IPv4 only

m/hut/configuration.nix

@@ -17,6 +17,7 @@
     ./postgresql.nix
     ./nginx.nix
     ./p.nix
+    ./hydra.nix
     #./pxe.nix
   ];
 

m/hut/hydra.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  services.hydra = {
+    enable = true;
+    hydraURL = "http://jungle.bsc.es/hydra"; # externally visible URL
+    notificationSender = "hydra@jungle.bsc.es"; # e-mail of Hydra service
+    port = 3001;
+    # a standalone Hydra will require you to unset the buildMachinesFiles list to avoid using a nonexistant /etc/nix/machines
+    buildMachinesFiles = [];
+    # you will probably also want, otherwise *everything* will be built from scratch
+    useSubstitutes = true;
+
+    listenHost = "0.0.0.0"; # Force IPv4
+  };
+}

m/hut/nginx.nix

@@ -48,6 +48,17 @@ in
           proxy_pass http://127.0.0.1:5000;
           proxy_redirect http:// $scheme://;
         }
+        location /hydra {
+          rewrite ^/hydra/(.*) /$1 break;
+          proxy_pass http://127.0.0.1:3001;
+          proxy_redirect http:// $scheme://;
+
+          proxy_set_header  Host              $host;
+          proxy_set_header  X-Real-IP         $remote_addr;
+          proxy_set_header  X-Forwarded-For   $proxy_add_x_forwarded_for;
+          proxy_set_header  X-Forwarded-Proto $scheme;
+          proxy_set_header  X-Request-Base    /hydra;
+        }
         location /lists {
           proxy_pass http://127.0.0.1:8081;
           proxy_redirect http:// $scheme://;