diff --git a/demo.js b/demo.js
index a73fe48..dffb0c6 100644
--- a/demo.js
+++ b/demo.js
@@ -11,9 +11,8 @@ function initialize() {
 	var pkg = require("./package.json");
 	var config = {
 		package: pkg,
-		//serverId: "bowie.local",
-		//servername: "foo-gl.test.utahrust.com",
 		staging: true,
+		cluster: true,
 
 		challenges: {
 			"dns-01": {
@@ -21,16 +20,16 @@ function initialize() {
 			}
 		},
 
-    notify: function (ev, params) {
-      console.log(ev, params);
-    }
+		notify: function(ev, params) {
+			console.log(ev, params);
+		}
 	};
 	return config;
 }
 
 function worker(glx) {
 	console.info();
-	console.info("Hello from worker");
+	console.info("Hello from worker #" + glx.id());
 
 	glx.serveApp(function(req, res) {
 		res.end("Hello, Encrypted World!");
diff --git a/master.js b/master.js
index abe2096..235ec0e 100644
--- a/master.js
+++ b/master.js
@@ -10,7 +10,7 @@ var msgPrefix = "greenlock:";
 
 Master.create = function(opts) {
 	var resolveCb;
-	var readyCb;
+	var _readyCb;
 	var _kicked = false;
 
 	var greenlock = require("./greenlock.js").create(opts);
@@ -18,7 +18,8 @@ Master.create = function(opts) {
 	var ready = new Promise(function(resolve) {
 		resolveCb = resolve;
 	}).then(function(fn) {
-		readyCb = fn;
+		_readyCb = fn;
+		return fn;
 	});
 
 	function kickoff() {
@@ -41,7 +42,7 @@ Master.create = function(opts) {
 			return master;
 		},
 		master: function(fn) {
-			if (readyCb) {
+			if (_readyCb) {
 				throw new Error("can't call master twice");
 			}
 			kickoff();
@@ -49,6 +50,7 @@ Master.create = function(opts) {
 			return master;
 		}
 	};
+	return master;
 };
 
 function range(n) {
@@ -67,15 +69,33 @@ Master._spawnWorkers = function(opts, greenlock) {
 	var numWorkers = parseInt(opts.numWorkers, 10);
 	if (!numWorkers) {
 		if (numCpus <= 2) {
-			numWorkers = numCpus;
+			numWorkers = 2;
 		} else {
 			numWorkers = numCpus - 1;
 		}
 	}
 
-	return range(numWorkers - 1).map(function() {
-		Master._spawnWorker(opts, greenlock);
-	});
+  cluster.on('exit', function () {
+    setTimeout(function () {
+      process.exit(3);
+    }, 100);
+  });
+
+	var workers = range(numWorkers);
+	function next() {
+		if (!workers.length) {
+			return;
+		}
+		workers.pop();
+
+		// for a nice aesthetic
+		setTimeout(function() {
+			Master._spawnWorker(opts, greenlock);
+			next();
+		}, 250);
+	}
+
+	next();
 };
 
 Master._spawnWorker = function(opts, greenlock) {
diff --git a/package-lock.json b/package-lock.json
index af7756b..c4f4f95 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,507 +1,128 @@
 {
-	"name": "greenlock-express",
-	"version": "2.7.18",
+	"name": "@root/greenlock-express",
+	"version": "3.0.0",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
+		"@root/acme": {
+			"version": "3.0.6",
+			"resolved": "https://registry.npmjs.org/@root/acme/-/acme-3.0.6.tgz",
+			"integrity": "sha512-KfgwcyWDsT90vz+gmWbCwuOBolwV5Gcg0WHsG8/dznDC7a6QF4AmZsil7mIWKGJxHdi6MElkyrHZyK53OhPnug==",
+			"requires": {
+				"@root/encoding": "^1.0.1",
+				"@root/keypairs": "^0.9.0",
+				"@root/pem": "^1.0.4",
+				"@root/request": "^1.3.11",
+				"@root/x509": "^0.7.2"
+			}
+		},
+		"@root/asn1": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/@root/asn1/-/asn1-1.0.0.tgz",
+			"integrity": "sha512-0lfZNuOULKJDJmdIkP8V9RnbV3XaK6PAHD3swnFy4tZwtlMDzLKoM/dfNad7ut8Hu3r91wy9uK0WA/9zym5mig==",
+			"requires": {
+				"@root/encoding": "^1.0.1"
+			}
+		},
+		"@root/csr": {
+			"version": "0.8.1",
+			"resolved": "https://registry.npmjs.org/@root/csr/-/csr-0.8.1.tgz",
+			"integrity": "sha512-hKl0VuE549TK6SnS2Yn9nRvKbFZXn/oAg+dZJU/tlKl/f/0yRXeuUzf8akg3JjtJq+9E592zDqeXZ7yyrg8fSQ==",
+			"requires": {
+				"@root/asn1": "^1.0.0",
+				"@root/pem": "^1.0.4",
+				"@root/x509": "^0.7.2"
+			}
+		},
+		"@root/encoding": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/@root/encoding/-/encoding-1.0.1.tgz",
+			"integrity": "sha512-OaEub02ufoU038gy6bsNHQOjIn8nUjGiLcaRmJ40IUykneJkIW5fxDqKxQx48cszuNflYldsJLPPXCrGfHs8yQ=="
+		},
+		"@root/greenlock": {
+			"version": "3.0.1",
+			"resolved": "https://registry.npmjs.org/@root/greenlock/-/greenlock-3.0.1.tgz",
+			"integrity": "sha512-Hyrnw/gXgmM4Ml7l0SAwYQ1FAq685dwRXpp7zmOxZDieUGWwP+GUcXOrEefph/lpELWJ5igcPzdEkIGtjMCTww==",
+			"requires": {
+				"@root/acme": "^3.0.6",
+				"@root/csr": "^0.8.1",
+				"@root/keypairs": "^0.9.0",
+				"@root/mkdirp": "^1.0.0",
+				"@root/request": "^1.3.10",
+				"acme-http-01-standalone": "^3.0.0",
+				"cert-info": "^1.5.1",
+				"greenlock-manager-fs": "^0.6.0",
+				"greenlock-store-fs": "^3.2.0",
+				"safe-replace": "^1.1.0"
+			}
+		},
+		"@root/keypairs": {
+			"version": "0.9.0",
+			"resolved": "https://registry.npmjs.org/@root/keypairs/-/keypairs-0.9.0.tgz",
+			"integrity": "sha512-NXE2L9Gv7r3iC4kB/gTPZE1vO9Ox/p14zDzAJ5cGpTpytbWOlWF7QoHSJbtVX4H7mRG/Hp7HR3jWdWdb2xaaXg==",
+			"requires": {
+				"@root/encoding": "^1.0.1",
+				"@root/pem": "^1.0.4",
+				"@root/x509": "^0.7.2"
+			}
+		},
 		"@root/mkdirp": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/@root/mkdirp/-/mkdirp-1.0.0.tgz",
 			"integrity": "sha512-hxGAYUx5029VggfG+U9naAhQkoMSXtOeXtbql97m3Hi6/sQSRL/4khKZPyOF6w11glyCOU38WCNLu9nUcSjOfA=="
 		},
+		"@root/pem": {
+			"version": "1.0.4",
+			"resolved": "https://registry.npmjs.org/@root/pem/-/pem-1.0.4.tgz",
+			"integrity": "sha512-rEUDiUsHtild8GfIjFE9wXtcVxeS+ehCJQBwbQQ3IVfORKHK93CFnRtkr69R75lZFjcmKYVc+AXDB+AeRFOULA=="
+		},
 		"@root/request": {
 			"version": "1.3.11",
 			"resolved": "https://registry.npmjs.org/@root/request/-/request-1.3.11.tgz",
 			"integrity": "sha512-3a4Eeghcjsfe6zh7EJ+ni1l8OK9Fz2wL1OjP4UCa0YdvtH39kdXB9RGWuzyNv7dZi0+Ffkc83KfH0WbPMiuJFw=="
 		},
-		"accepts": {
-			"version": "1.3.5",
-			"resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
-			"integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
-			"dev": true,
+		"@root/x509": {
+			"version": "0.7.2",
+			"resolved": "https://registry.npmjs.org/@root/x509/-/x509-0.7.2.tgz",
+			"integrity": "sha512-ENq3LGYORK5NiMFHEVeNMt+fTXaC7DTS6sQXoqV+dFdfT0vmiL5cDLjaXQhaklJQq0NiwicZegzJRl1ZOTp3WQ==",
 			"requires": {
-				"mime-types": "~2.1.18",
-				"negotiator": "0.6.1"
+				"@root/asn1": "^1.0.0",
+				"@root/encoding": "^1.0.1"
 			}
 		},
-		"acme": {
-			"version": "1.3.5",
-			"resolved": "https://registry.npmjs.org/acme/-/acme-1.3.5.tgz",
-			"integrity": "sha512-KIFVyMho7y3RxRSTzkuX031TmfXwzl0ioy8+r2pnfLz6YWFQ5q7a/cYUDTgIbrFMPe/syY26Qv1DOdHQ5ARWcw==",
-			"requires": {
-				"acme-v2": "^1.8.6"
-			}
-		},
-		"acme-dns-01-cli": {
-			"version": "3.0.7",
-			"resolved": "https://registry.npmjs.org/acme-dns-01-cli/-/acme-dns-01-cli-3.0.7.tgz",
-			"integrity": "sha512-Aa4bUpq6ftX1VODiShOetOY5U0tsXY5EV7+fQwme3Q8Y9rjYBArBXHgFCAVKtK1AF+Ev8pIuF6Z42hzMFa73/w=="
-		},
-		"acme-v2": {
-			"version": "1.8.6",
-			"resolved": "https://registry.npmjs.org/acme-v2/-/acme-v2-1.8.6.tgz",
-			"integrity": "sha512-LWdicUYHTGDtYX7LlgsQurmM9txwfAFydg7mQLPKHrFMnNNtfJEtHC2fWfr+pFGNb3XKIbvyFUoyFB6cOmWRpA==",
-			"requires": {
-				"@root/request": "^1.3.11",
-				"rsa-compat": "^2.0.8"
-			}
-		},
-		"array-flatten": {
-			"version": "1.1.1",
-			"resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-			"integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
-			"dev": true
-		},
-		"async-limiter": {
-			"version": "1.0.0",
-			"resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
-			"integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
-			"dev": true
-		},
-		"basic-auth": {
-			"version": "2.0.1",
-			"resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.1.tgz",
-			"integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
-			"dev": true,
-			"requires": {
-				"safe-buffer": "5.1.2"
-			}
-		},
-		"batch": {
-			"version": "0.6.1",
-			"resolved": "https://registry.npmjs.org/batch/-/batch-0.6.1.tgz",
-			"integrity": "sha1-3DQxT05nkxgJP8dgJyUl+UvyXBY=",
-			"dev": true
-		},
-		"body-parser": {
-			"version": "1.18.3",
-			"resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
-			"integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
-			"dev": true,
-			"requires": {
-				"bytes": "3.0.0",
-				"content-type": "~1.0.4",
-				"debug": "2.6.9",
-				"depd": "~1.1.2",
-				"http-errors": "~1.6.3",
-				"iconv-lite": "0.4.23",
-				"on-finished": "~2.3.0",
-				"qs": "6.5.2",
-				"raw-body": "2.3.3",
-				"type-is": "~1.6.16"
-			}
-		},
-		"bytes": {
+		"acme-http-01-standalone": {
 			"version": "3.0.0",
-			"resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
-			"integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg=",
-			"dev": true
+			"resolved": "https://registry.npmjs.org/acme-http-01-standalone/-/acme-http-01-standalone-3.0.0.tgz",
+			"integrity": "sha512-lZqVab2UZ1Dp36HemfhGEvdYOcVNg5wyVXNjtPUqGSAOVUOKqwi3gDrTGwqz+FBrEEEEpTngDPaZn2g3hfmPLA=="
 		},
 		"cert-info": {
 			"version": "1.5.1",
 			"resolved": "https://registry.npmjs.org/cert-info/-/cert-info-1.5.1.tgz",
 			"integrity": "sha512-eoQC/yAgW3gKTKxjzyClvi+UzuY97YCjcl+lSqbsGIy7HeGaWxCPOQFivhUYm27hgsBMhsJJFya3kGvK6PMIcQ=="
 		},
-		"content-disposition": {
-			"version": "0.5.2",
-			"resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
-			"integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
-			"dev": true
-		},
-		"content-type": {
-			"version": "1.0.4",
-			"resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
-			"integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
-			"dev": true
-		},
-		"cookie": {
-			"version": "0.3.1",
-			"resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-			"integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
-			"dev": true
-		},
-		"cookie-signature": {
-			"version": "1.0.6",
-			"resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
-			"integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
-			"dev": true
-		},
-		"debug": {
-			"version": "2.6.9",
-			"resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-			"integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-			"dev": true,
-			"requires": {
-				"ms": "2.0.0"
-			}
-		},
-		"depd": {
-			"version": "1.1.2",
-			"resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
-			"integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
-			"dev": true
-		},
-		"destroy": {
-			"version": "1.0.4",
-			"resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
-			"integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
-			"dev": true
-		},
-		"eckles": {
-			"version": "1.4.1",
-			"resolved": "https://registry.npmjs.org/eckles/-/eckles-1.4.1.tgz",
-			"integrity": "sha512-auWyk/k8oSkVHaD4RxkPadKsLUcIwKgr/h8F7UZEueFDBO7BsE4y+H6IMUDbfqKIFPg/9MxV6KcBdJCmVVcxSA=="
-		},
-		"ee-first": {
-			"version": "1.1.1",
-			"resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
-			"integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
-			"dev": true
-		},
-		"encodeurl": {
-			"version": "1.0.2",
-			"resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
-			"integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
-			"dev": true
-		},
 		"escape-html": {
 			"version": "1.0.3",
 			"resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
 			"integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
 		},
-		"etag": {
-			"version": "1.8.1",
-			"resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
-			"integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
-			"dev": true
-		},
-		"eventemitter3": {
-			"version": "3.1.2",
-			"resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.2.tgz",
-			"integrity": "sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q==",
-			"dev": true
-		},
-		"express": {
-			"version": "4.16.4",
-			"resolved": "https://registry.npmjs.org/express/-/express-4.16.4.tgz",
-			"integrity": "sha512-j12Uuyb4FMrd/qQAm6uCHAkPtO8FDTRJZBDd5D2KOL2eLaz1yUNdUB/NOIyq0iU4q4cFarsUCrnFDPBcnksuOg==",
-			"dev": true,
+		"greenlock-manager-fs": {
+			"version": "0.6.0",
+			"resolved": "https://registry.npmjs.org/greenlock-manager-fs/-/greenlock-manager-fs-0.6.0.tgz",
+			"integrity": "sha512-o5RZ/T4j6eaUXCVnZ2dScE1pAjFuS8/R4ZDn7mCyRkxBjZvXJU7TpYe5Bc/wmN8x+gLHqVUECZWC6VdA/DbShQ==",
 			"requires": {
-				"accepts": "~1.3.5",
-				"array-flatten": "1.1.1",
-				"body-parser": "1.18.3",
-				"content-disposition": "0.5.2",
-				"content-type": "~1.0.4",
-				"cookie": "0.3.1",
-				"cookie-signature": "1.0.6",
-				"debug": "2.6.9",
-				"depd": "~1.1.2",
-				"encodeurl": "~1.0.2",
-				"escape-html": "~1.0.3",
-				"etag": "~1.8.1",
-				"finalhandler": "1.1.1",
-				"fresh": "0.5.2",
-				"merge-descriptors": "1.0.1",
-				"methods": "~1.1.2",
-				"on-finished": "~2.3.0",
-				"parseurl": "~1.3.2",
-				"path-to-regexp": "0.1.7",
-				"proxy-addr": "~2.0.4",
-				"qs": "6.5.2",
-				"range-parser": "~1.2.0",
-				"safe-buffer": "5.1.2",
-				"send": "0.16.2",
-				"serve-static": "1.13.2",
-				"setprototypeof": "1.1.0",
-				"statuses": "~1.4.0",
-				"type-is": "~1.6.16",
-				"utils-merge": "1.0.1",
-				"vary": "~1.1.2"
-			}
-		},
-		"express-basic-auth": {
-			"version": "1.2.0",
-			"resolved": "https://registry.npmjs.org/express-basic-auth/-/express-basic-auth-1.2.0.tgz",
-			"integrity": "sha512-iJ0h1Gk6fZRrFmO7tP9nIbxwNgCUJASfNj5fb0Hy15lGtbqqsxpt7609+wq+0XlByZjXmC/rslWQtnuSTVRIcg==",
-			"dev": true,
-			"requires": {
-				"basic-auth": "^2.0.1"
-			}
-		},
-		"finalhandler": {
-			"version": "1.1.1",
-			"resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.1.tgz",
-			"integrity": "sha512-Y1GUDo39ez4aHAw7MysnUD5JzYX+WaIj8I57kO3aEPT1fFRL4sr7mjei97FgnwhAyyzRYmQZaTHb2+9uZ1dPtg==",
-			"dev": true,
-			"requires": {
-				"debug": "2.6.9",
-				"encodeurl": "~1.0.2",
-				"escape-html": "~1.0.3",
-				"on-finished": "~2.3.0",
-				"parseurl": "~1.3.2",
-				"statuses": "~1.4.0",
-				"unpipe": "~1.0.0"
-			}
-		},
-		"follow-redirects": {
-			"version": "1.7.0",
-			"resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.7.0.tgz",
-			"integrity": "sha512-m/pZQy4Gj287eNy94nivy5wchN3Kp+Q5WgUPNy5lJSZ3sgkVKSYV/ZChMAQVIgx1SqfZ2zBZtPA2YlXIWxxJOQ==",
-			"dev": true,
-			"requires": {
-				"debug": "^3.2.6"
-			},
-			"dependencies": {
-				"debug": {
-					"version": "3.2.6",
-					"resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
-					"integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-					"dev": true,
-					"requires": {
-						"ms": "^2.1.1"
-					}
-				},
-				"ms": {
-					"version": "2.1.2",
-					"resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-					"integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
-					"dev": true
-				}
-			}
-		},
-		"forwarded": {
-			"version": "0.1.2",
-			"resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
-			"integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=",
-			"dev": true
-		},
-		"fresh": {
-			"version": "0.5.2",
-			"resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
-			"integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac=",
-			"dev": true
-		},
-		"greenlock": {
-			"version": "2.8.8",
-			"resolved": "https://registry.npmjs.org/greenlock/-/greenlock-2.8.8.tgz",
-			"integrity": "sha512-U2pqxXXf0naeZc2363Xe174C6/T9lXGZYQjXBqa/PMb1CYRQuHwXlAqFEUu75JkxyHAzFGj/uliqSyQwIc91Yg==",
-			"requires": {
-				"acme": "^1.3.5",
-				"acme-dns-01-cli": "^3.0.0",
-				"acme-v2": "^1.8.6",
-				"cert-info": "^1.5.1",
-				"greenlock-store-fs": "^3.0.2",
-				"keypairs": "^1.2.14",
-				"le-challenge-fs": "^2.0.2",
-				"le-sni-auto": "^2.1.9",
-				"le-store-certbot": "^2.2.3",
-				"rsa-compat": "^2.0.8"
+				"@root/mkdirp": "^1.0.0",
+				"safe-replace": "^1.1.0"
 			}
 		},
 		"greenlock-store-fs": {
-			"version": "3.0.2",
-			"resolved": "https://registry.npmjs.org/greenlock-store-fs/-/greenlock-store-fs-3.0.2.tgz",
-			"integrity": "sha512-t4So75yKs1+7TqmxD5UKdf+zOQU0/4o0lb2auf5zUcAo7fwwNLOAXyWnnZRL3WuFBUiBGh1qXWleuMua0d3LPg==",
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/greenlock-store-fs/-/greenlock-store-fs-3.2.0.tgz",
+			"integrity": "sha512-zqcPnF+173oYq5qU7FoGtuqeG8dmmvAiSnz98kEHAHyvgRF9pE1T0MM0AuqDdj45I3kXlCj2gZBwutnRi37J3g==",
 			"requires": {
 				"@root/mkdirp": "^1.0.0",
 				"safe-replace": "^1.1.0"
 			}
 		},
-		"http-errors": {
-			"version": "1.6.3",
-			"resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
-			"integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
-			"dev": true,
-			"requires": {
-				"depd": "~1.1.2",
-				"inherits": "2.0.3",
-				"setprototypeof": "1.1.0",
-				"statuses": ">= 1.4.0 < 2"
-			}
-		},
-		"http-proxy": {
-			"version": "1.17.0",
-			"resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.17.0.tgz",
-			"integrity": "sha512-Taqn+3nNvYRfJ3bGvKfBSRwy1v6eePlm3oc/aWVxZp57DQr5Eq3xhKJi7Z4hZpS8PC3H4qI+Yly5EmFacGuA/g==",
-			"dev": true,
-			"requires": {
-				"eventemitter3": "^3.0.0",
-				"follow-redirects": "^1.0.0",
-				"requires-port": "^1.0.0"
-			}
-		},
-		"iconv-lite": {
-			"version": "0.4.23",
-			"resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.23.tgz",
-			"integrity": "sha512-neyTUVFtahjf0mB3dZT77u+8O0QB89jFdnBkd5P1JgYPbPaia3gXXOVL2fq8VyU2gMMD7SaN7QukTB/pmXYvDA==",
-			"dev": true,
-			"requires": {
-				"safer-buffer": ">= 2.1.2 < 3"
-			}
-		},
-		"inherits": {
-			"version": "2.0.3",
-			"resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-			"integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
-			"dev": true
-		},
-		"ipaddr.js": {
-			"version": "1.8.0",
-			"resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.8.0.tgz",
-			"integrity": "sha1-6qM9bd16zo9/b+DJygRA5wZzix4=",
-			"dev": true
-		},
-		"keypairs": {
-			"version": "1.2.14",
-			"resolved": "https://registry.npmjs.org/keypairs/-/keypairs-1.2.14.tgz",
-			"integrity": "sha512-ZoZfZMygyB0QcjSlz7Rh6wT2CJasYEHBPETtmHZEfxuJd7bnsOG5AdtPZqHZBT+hoHvuWCp/4y8VmvTvH0Y9uA==",
-			"requires": {
-				"eckles": "^1.4.1",
-				"rasha": "^1.2.4"
-			}
-		},
-		"le-challenge-fs": {
-			"version": "2.0.9",
-			"resolved": "https://registry.npmjs.org/le-challenge-fs/-/le-challenge-fs-2.0.9.tgz",
-			"integrity": "sha512-stzI6rxd+aXGxBl87QJKKY/i/wl3uz6EoWzX2xSazJvCPSYBQys1RVNgOcf0SfUQPh6TBCFJFSJkiR4mznb4sg==",
-			"requires": {
-				"@root/mkdirp": "^1.0.0"
-			}
-		},
-		"le-sni-auto": {
-			"version": "2.1.9",
-			"resolved": "https://registry.npmjs.org/le-sni-auto/-/le-sni-auto-2.1.9.tgz",
-			"integrity": "sha512-QmQHNwQDi/56GY8+qczFZ06FZbxaeJQjbjEhwwQHhkJ9IHhIQFkPfCT/OyDfLj4gqLIrg5ZX8CemxxVZnLEYfg=="
-		},
-		"le-store-certbot": {
-			"version": "2.2.3",
-			"resolved": "https://registry.npmjs.org/le-store-certbot/-/le-store-certbot-2.2.3.tgz",
-			"integrity": "sha512-c4ACR+v+JKMiAOOshLh6gdCKA7wIWR16+mROMLpQjq3rXJ3Vm8FaBHe2H+crT+flP+g7FmciAwUlfOJEJpIuCQ==",
-			"requires": {
-				"@root/mkdirp": "^1.0.0",
-				"pyconf": "^1.1.7",
-				"safe-replace": "^1.1.0"
-			}
-		},
-		"media-typer": {
-			"version": "0.3.0",
-			"resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
-			"integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g=",
-			"dev": true
-		},
-		"merge-descriptors": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
-			"integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E=",
-			"dev": true
-		},
-		"methods": {
-			"version": "1.1.2",
-			"resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
-			"integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4=",
-			"dev": true
-		},
-		"mime": {
-			"version": "1.4.1",
-			"resolved": "https://registry.npmjs.org/mime/-/mime-1.4.1.tgz",
-			"integrity": "sha512-KI1+qOZu5DcW6wayYHSzR/tXKCDC5Om4s1z2QJjDULzLcmf3DvzS7oluY4HCTrc+9FiKmWUgeNLg7W3uIQvxtQ==",
-			"dev": true
-		},
-		"mime-db": {
-			"version": "1.38.0",
-			"resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.38.0.tgz",
-			"integrity": "sha512-bqVioMFFzc2awcdJZIzR3HjZFX20QhilVS7hytkKrv7xFAn8bM1gzc/FOX2awLISvWe0PV8ptFKcon+wZ5qYkg==",
-			"dev": true
-		},
-		"mime-types": {
-			"version": "2.1.22",
-			"resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.22.tgz",
-			"integrity": "sha512-aGl6TZGnhm/li6F7yx82bJiBZwgiEa4Hf6CNr8YO+r5UHr53tSTYZb102zyU50DOWWKeOv0uQLRL0/9EiKWCog==",
-			"dev": true,
-			"requires": {
-				"mime-db": "~1.38.0"
-			}
-		},
-		"ms": {
-			"version": "2.0.0",
-			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-			"integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-			"dev": true
-		},
-		"negotiator": {
-			"version": "0.6.1",
-			"resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.1.tgz",
-			"integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk=",
-			"dev": true
-		},
-		"on-finished": {
-			"version": "2.3.0",
-			"resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
-			"integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
-			"dev": true,
-			"requires": {
-				"ee-first": "1.1.1"
-			}
-		},
-		"parseurl": {
-			"version": "1.3.2",
-			"resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.2.tgz",
-			"integrity": "sha1-/CidTtiZMRlGDBViUyYs3I3mW/M=",
-			"dev": true
-		},
-		"path-to-regexp": {
-			"version": "0.1.7",
-			"resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
-			"integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=",
-			"dev": true
-		},
-		"proxy-addr": {
-			"version": "2.0.4",
-			"resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.4.tgz",
-			"integrity": "sha512-5erio2h9jp5CHGwcybmxmVqHmnCBZeewlfJ0pex+UW7Qny7OOZXTtH56TGNyBizkgiOwhJtMKrVzDTeKcySZwA==",
-			"dev": true,
-			"requires": {
-				"forwarded": "~0.1.2",
-				"ipaddr.js": "1.8.0"
-			}
-		},
-		"pyconf": {
-			"version": "1.1.7",
-			"resolved": "https://registry.npmjs.org/pyconf/-/pyconf-1.1.7.tgz",
-			"integrity": "sha512-v4clh33m68sjtMsh8XMpjhGWb/MQODAYZ1y7ORG5Qv58UK25OddoB+oXyexgDkK8ttFui/lZm2sQDgA2Ftjfkw==",
-			"requires": {
-				"safe-replace": "^1.0.2"
-			}
-		},
-		"qs": {
-			"version": "6.5.2",
-			"resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
-			"integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
-			"dev": true
-		},
-		"range-parser": {
-			"version": "1.2.0",
-			"resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.0.tgz",
-			"integrity": "sha1-9JvmtIeJTdxA3MlKMi9hEJLgDV4=",
-			"dev": true
-		},
-		"rasha": {
-			"version": "1.2.5",
-			"resolved": "https://registry.npmjs.org/rasha/-/rasha-1.2.5.tgz",
-			"integrity": "sha512-KxtX+/fBk+wM7O3CNgwjSh5elwFilLvqWajhr6wFr2Hd63JnKTTi43Tw+Jb1hxJQWOwoya+NZWR2xztn3hCrTw=="
-		},
-		"raw-body": {
-			"version": "2.3.3",
-			"resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.3.3.tgz",
-			"integrity": "sha512-9esiElv1BrZoI3rCDuOuKCBRbuApGGaDPQfjSflGxdy4oyzqghxu6klEkkVIvBje+FF0BX9coEv8KqW6X/7njw==",
-			"dev": true,
-			"requires": {
-				"bytes": "3.0.0",
-				"http-errors": "1.6.3",
-				"iconv-lite": "0.4.23",
-				"unpipe": "1.0.0"
-			}
-		},
 		"redirect-https": {
 			"version": "1.3.0",
 			"resolved": "https://registry.npmjs.org/redirect-https/-/redirect-https-1.3.0.tgz",
@@ -510,133 +131,10 @@
 				"escape-html": "^1.0.3"
 			}
 		},
-		"requires-port": {
-			"version": "1.0.0",
-			"resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
-			"integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
-			"dev": true
-		},
-		"rsa-compat": {
-			"version": "2.0.8",
-			"resolved": "https://registry.npmjs.org/rsa-compat/-/rsa-compat-2.0.8.tgz",
-			"integrity": "sha512-BFiiSEbuxzsVdaxpejbxfX07qs+rtous49Y6mL/zw6YHh9cranDvm2BvBmqT3rso84IsxNlP5BXnuNvm1Wn3Tw==",
-			"requires": {
-				"keypairs": "^1.2.14"
-			}
-		},
-		"safe-buffer": {
-			"version": "5.1.2",
-			"resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-			"integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-			"dev": true
-		},
 		"safe-replace": {
 			"version": "1.1.0",
 			"resolved": "https://registry.npmjs.org/safe-replace/-/safe-replace-1.1.0.tgz",
 			"integrity": "sha512-9/V2E0CDsKs9DWOOwJH7jYpSl9S3N05uyevNjvsnDauBqRowBPOyot1fIvV5N2IuZAbYyvrTXrYFVG0RZInfFw=="
-		},
-		"safer-buffer": {
-			"version": "2.1.2",
-			"resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-			"integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-			"dev": true
-		},
-		"send": {
-			"version": "0.16.2",
-			"resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
-			"integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
-			"dev": true,
-			"requires": {
-				"debug": "2.6.9",
-				"depd": "~1.1.2",
-				"destroy": "~1.0.4",
-				"encodeurl": "~1.0.2",
-				"escape-html": "~1.0.3",
-				"etag": "~1.8.1",
-				"fresh": "0.5.2",
-				"http-errors": "~1.6.2",
-				"mime": "1.4.1",
-				"ms": "2.0.0",
-				"on-finished": "~2.3.0",
-				"range-parser": "~1.2.0",
-				"statuses": "~1.4.0"
-			}
-		},
-		"serve-index": {
-			"version": "1.9.1",
-			"resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.9.1.tgz",
-			"integrity": "sha1-03aNabHn2C5c4FD/9bRTvqEqkjk=",
-			"dev": true,
-			"requires": {
-				"accepts": "~1.3.4",
-				"batch": "0.6.1",
-				"debug": "2.6.9",
-				"escape-html": "~1.0.3",
-				"http-errors": "~1.6.2",
-				"mime-types": "~2.1.17",
-				"parseurl": "~1.3.2"
-			}
-		},
-		"serve-static": {
-			"version": "1.13.2",
-			"resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.2.tgz",
-			"integrity": "sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==",
-			"dev": true,
-			"requires": {
-				"encodeurl": "~1.0.2",
-				"escape-html": "~1.0.3",
-				"parseurl": "~1.3.2",
-				"send": "0.16.2"
-			}
-		},
-		"setprototypeof": {
-			"version": "1.1.0",
-			"resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
-			"integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
-			"dev": true
-		},
-		"statuses": {
-			"version": "1.4.0",
-			"resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
-			"integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
-			"dev": true
-		},
-		"type-is": {
-			"version": "1.6.16",
-			"resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
-			"integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
-			"dev": true,
-			"requires": {
-				"media-typer": "0.3.0",
-				"mime-types": "~2.1.18"
-			}
-		},
-		"unpipe": {
-			"version": "1.0.0",
-			"resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-			"integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
-			"dev": true
-		},
-		"utils-merge": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-			"integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
-			"dev": true
-		},
-		"vary": {
-			"version": "1.1.2",
-			"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-			"integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
-			"dev": true
-		},
-		"ws": {
-			"version": "5.2.2",
-			"resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
-			"integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
-			"dev": true,
-			"requires": {
-				"async-limiter": "~1.0.0"
-			}
 		}
 	}
 }
diff --git a/package.json b/package.json
index 4d7b74e..cd7debe 100644
--- a/package.json
+++ b/package.json
@@ -1,24 +1,26 @@
 {
-	"name": "greenlock-express",
-	"version": "2.7.18",
+	"name": "@root/greenlock-express",
+	"version": "3.0.0",
 	"description": "Free SSL and managed or automatic HTTPS for node.js with Express, Koa, Connect, Hapi, and all other middleware systems.",
-	"main": "index.js",
+	"main": "greenlock-express.js",
 	"homepage": "https://greenlock.domains",
+	"files": [
+		"*.js",
+		"lib",
+		"scripts"
+	],
+	"scripts": {
+		"start": "node_todo server.js ./config.js",
+		"test": "node_todo test/greenlock.js"
+	},
 	"directories": {
 		"example": "examples"
 	},
 	"dependencies": {
-		"greenlock": "^2.8.8",
+		"@root/greenlock": "^3.0.1",
 		"redirect-https": "^1.1.5"
 	},
-	"files": [
-		"lib",
-		"scripts"
-	],
 	"trulyOptionalDependencies": {
-		"spdy": "^3.4.7"
-	},
-	"devDependencies": {
 		"http-proxy": "^1.17.0",
 		"express": "^4.16.3",
 		"express-basic-auth": "^1.2.0",
@@ -27,10 +29,7 @@
 		"serve-static": "^1.13.2",
 		"ws": "^5.2.1"
 	},
-	"scripts": {
-		"start": "node server.js ./config.js",
-		"test": "node test/greenlock.js"
-	},
+	"devDependencies": {},
 	"repository": {
 		"type": "git",
 		"url": "https://git.rootprojects.org/root/greenlock-express.js.git"
diff --git a/servers.js b/servers.js
index 637108b..b1ecb6a 100644
--- a/servers.js
+++ b/servers.js
@@ -8,7 +8,7 @@ var HttpsMiddleware = require("./https-middleware.js");
 var sni = require("./sni.js");
 var cluster = require("cluster");
 
-Servers.create = function(greenlock, opts) {
+Servers.create = function(greenlock) {
 	var servers = {};
 	var _httpServer;
 	var _httpsServer;
@@ -49,7 +49,7 @@ Servers.create = function(greenlock, opts) {
 		}
 
 		_httpsServer = createSecureServer(
-			wrapDefaultSniCallback(opts, greenlock, secureOpts),
+			wrapDefaultSniCallback(greenlock, secureOpts),
 			HttpsMiddleware.create(greenlock, function(req, res) {
 				if (!_middlewareApp) {
 					throw new Error("Set app with `glx.serveApp(app)` or `glx.httpsServer(tlsOptions, app)`");
@@ -62,6 +62,9 @@ Servers.create = function(greenlock, opts) {
 		return _httpsServer;
 	};
 
+	servers.id = function() {
+		return (cluster.isWorker && cluster.worker.id) || "0";
+	};
 	servers.serveApp = function(app) {
 		return new Promise(function(resolve, reject) {
 			if ("function" !== typeof app) {
@@ -70,7 +73,7 @@ Servers.create = function(greenlock, opts) {
 			}
 
 			var id = cluster.isWorker && cluster.worker.id;
-			var idstr = (id && "$" + id + " ") || "";
+			var idstr = (id && "#" + id + " ") || "";
 			var plainServer = servers.httpServer(require("redirect-https")());
 			var plainAddr = "0.0.0.0";
 			var plainPort = 80;
@@ -115,7 +118,7 @@ function explainError(e) {
 	console.error();
 }
 
-function wrapDefaultSniCallback(opts, greenlock, secureOpts) {
+function wrapDefaultSniCallback(greenlock, secureOpts) {
 	// I'm not sure yet if the original SNICallback
 	// should be called before or after, so I'm just
 	// going to delay making that choice until I have the use case
@@ -136,7 +139,8 @@ function wrapDefaultSniCallback(opts, greenlock, secureOpts) {
 		console.warn();
 	}
 
-	secureOpts.SNICallback = sni.create(opts, greenlock, secureOpts);
+	// TODO greenlock.servername for workers
+	secureOpts.SNICallback = sni.create(greenlock, secureOpts);
 	return secureOpts;
 }
 
diff --git a/single.js b/single.js
index 28fa190..9d529c1 100644
--- a/single.js
+++ b/single.js
@@ -8,7 +8,7 @@ var Servers = require("./servers.js");
 Single.create = function(opts) {
 	var greenlock = require("./greenlock.js").create(opts);
 
-	var servers = Servers.create(greenlock, opts);
+	var servers = Servers.create(greenlock);
 
 	var single = {
 		serve: function(fn) {
diff --git a/sni.js b/sni.js
index 9d2b5a6..3feb283 100644
--- a/sni.js
+++ b/sni.js
@@ -11,10 +11,10 @@ var refreshStagger = Math.round(Math.PI * 5 * (60 * 1000));
 // and another, about 30 seconds
 var smallStagger = Math.round(Math.PI * (30 * 1000));
 
-//secureOpts.SNICallback = sni.create(opts, greenlock, secureOpts);
-sni.create = function(opts, greenlock, secureOpts) {
+//secureOpts.SNICallback = sni.create(greenlock, secureOpts);
+sni.create = function(greenlock, secureOpts) {
 	var _cache = {};
-	var defaultServername = opts.servername || greenlock.servername || "";
+	var defaultServername = greenlock.servername || "";
 
 	if (secureOpts.cert) {
 		// Note: it's fine if greenlock.servername is undefined,
@@ -30,7 +30,7 @@ sni.create = function(opts, greenlock, secureOpts) {
 	function notify(ev, args) {
 		try {
 			// TODO _notify() or notify()?
-			(opts.notify || greenlock.notify || greenlock._notify)(ev, args);
+			(greenlock.notify || greenlock._notify)(ev, args);
 		} catch (e) {
 			console.error(e);
 			console.error(ev, args);
@@ -158,7 +158,7 @@ sni.create = function(opts, greenlock, secureOpts) {
 				_cache[altname] = meta;
 			});
 
-      return meta.secureContext;
+			return meta.secureContext;
 		});
 	}
 
diff --git a/worker.js b/worker.js
index 22697d8..ede8b50 100644
--- a/worker.js
+++ b/worker.js
@@ -3,7 +3,7 @@
 var Worker = module.exports;
 // *very* generous, but well below the http norm of 120
 var messageTimeout = 30 * 1000;
-var msgPrefix = 'greenlock:';
+var msgPrefix = "greenlock:";
 
 Worker.create = function() {
 	var greenlock = {};
@@ -30,6 +30,7 @@ Worker.create = function() {
 function rpc(funcname, msg) {
 	return new Promise(function(resolve, reject) {
 		var rnd = Math.random()
+			.toString()
 			.slice(2)
 			.toString(16);
 		var id = msgPrefix + rnd;