Increase timeout for coredns cache.

nix/kubernetes/keys/scope.nix

@@ -283,6 +283,46 @@ makeScope newScope (
                 "10.197.0.10"
               ];
             };
+
+            servers = [
+              {
+                zones = [
+                  {
+                    zone = ".";
+                    use_tcp = true;
+                  }
+                ];
+                port = 53;
+                plugins = [
+                  { name = "errors"; }
+                  {
+                    name = "health";
+                    configBlock = "lameduck 10s";
+                  }
+                  { name = "ready"; }
+                  {
+                    name = "kubernetes";
+                    parameters = "cluster.local in-addr.arpa ip6.arpa";
+                    configBlock = "pods insecure\nfallthrough in-addr.arpa ip6.arpa\nttl 30";
+                  }
+                  {
+                    name = "prometheus";
+                    parameters = "0.0.0.0:9153";
+                  }
+                  {
+                    name = "forward";
+                    parameters = ". /etc/resolv.conf";
+                  }
+                  {
+                    name = "cache";
+                    parameters = 300; # default 30
+                  }
+                  { name = "loop"; }
+                  { name = "reload"; }
+                  { name = "loadbalance"; }
+                ];
+              }
+            ];
           };
         }
       ));