diff --git a/app.js b/app.js
index d4f12dc..065522b 100644
--- a/app.js
+++ b/app.js
@@ -1,18 +1,4 @@
-const assert = require('assert');
-assert.ok(process.env.JAMBONES_MYSQL_HOST &&
-  process.env.JAMBONES_MYSQL_USER &&
-  process.env.JAMBONES_MYSQL_PASSWORD &&
-  process.env.JAMBONES_MYSQL_DATABASE, 'missing JAMBONES_MYSQL_XXX env vars');
-if (process.env.JAMBONES_REDIS_SENTINELS) {
-  assert.ok(process.env.JAMBONES_REDIS_SENTINEL_MASTER_NAME,
-    'missing JAMBONES_REDIS_SENTINEL_MASTER_NAME env var, JAMBONES_REDIS_SENTINEL_PASSWORD env var is optional');
-} else {
-  assert.ok(process.env.JAMBONES_REDIS_HOST, 'missing JAMBONES_REDIS_HOST env var');
-}
-assert.ok(process.env.DRACHTIO_PORT || process.env.DRACHTIO_HOST, 'missing DRACHTIO_PORT env vars');
-assert.ok(process.env.DRACHTIO_SECRET, 'missing DRACHTIO_SECRET env var');
-assert.ok(process.env.JAMBONES_TIME_SERIES_HOST, 'missing JAMBONES_TIME_SERIES_HOST env var');
-assert.ok(process.env.JAMBONES_NETWORK_CIDR || process.env.K8S, 'missing JAMBONES_NETWORK_CIDR env var');
+require('./lib/config').validateEnvVars();
 
 const Srf = require('drachtio-srf');
 const srf = new Srf('sbc-inbound');
diff --git a/lib/config.js b/lib/config.js
new file mode 100644
index 0000000..f2c8add
--- /dev/null
+++ b/lib/config.js
@@ -0,0 +1,41 @@
+const assert = require('assert');
+
+const requiredEnvVars = [
+  'JAMBONES_MYSQL_HOST',
+  'JAMBONES_MYSQL_USER',
+  'JAMBONES_MYSQL_PASSWORD',
+  'JAMBONES_MYSQL_DATABASE',
+  'DRACHTIO_SECRET',
+  'JAMBONES_TIME_SERIES_HOST'
+];
+
+if (process.env.JAMBONES_REDIS_SENTINELS) {
+  requiredEnvVars.push('JAMBONES_REDIS_SENTINEL_MASTER_NAME');
+} else {
+  requiredEnvVars.push('JAMBONES_REDIS_HOST');
+}
+
+if (process.env.DRACHTIO_HOST || process.env.DRACHTIO_PORT) {
+  requiredEnvVars.push(process.env.DRACHTIO_HOST ? 'DRACHTIO_HOST' : 'DRACHTIO_PORT');
+}
+
+if (process.env.DRACHTIO_HOST && !process.env.K8S) {
+  assert.ok(process.env.JAMBONES_NETWORK_CIDR,
+    'Missing JAMBONES_NETWORK_CIDR env var (required when DRACHTIO_HOST is set and not in K8S)');
+} else if (process.env.K8S && process.env.K8S_FEATURE_SERVER_SERVICE_NAME) {
+  requiredEnvVars.push('K8S');
+  requiredEnvVars.push('K8S_FEATURE_SERVER_SERVICE_NAME');
+} else {
+  assert.ok(process.env.K8S && !process.env.K8S_FEATURE_SERVER_SERVICE_NAME,
+    'when running in Kubernetes, an env var K8S_FEATURE_SERVER_SERVICE_NAME is required');
+}
+
+const validateEnvVars = () => {
+  requiredEnvVars.forEach((envVar) => {
+    assert.ok(process.env[envVar], `Missing ${envVar} env var`);
+  });
+};
+
+module.exports = {
+  validateEnvVars
+};
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 2b504fa..0b54659 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2685,9 +2685,10 @@
       "dev": true
     },
     "node_modules/cookie": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.6.0.tgz",
-      "integrity": "sha512-U71cyTamuh1CRNCfpGY6to28lxvNwPG4Guz/EVjgf3Jmzv0vlDp1atT9eS5dDjMYHucpHbWns6Lwf3BKz6svdw==",
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.1.tgz",
+      "integrity": "sha512-6DnInpx7SJ2AK3+CTUE/ZM0vWTUboZCegxhC2xiIydHR9jNuTAASBrfEpHhiGOZw/nX51bHt6YQl8jsGo4y/0w==",
+      "license": "MIT",
       "engines": {
         "node": ">= 0.6"
       }
@@ -3424,16 +3425,17 @@
       }
     },
     "node_modules/express": {
-      "version": "4.21.0",
-      "resolved": "https://registry.npmjs.org/express/-/express-4.21.0.tgz",
-      "integrity": "sha512-VqcNGcj/Id5ZT1LZ/cfihi3ttTn+NJmkli2eZADigjq29qTlWi/hAQ43t/VLPq8+UX06FCEx3ByOYet6ZFblng==",
+      "version": "4.21.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.21.1.tgz",
+      "integrity": "sha512-YSFlK1Ee0/GC8QaO91tHcDxJiE/X4FbpAyQWkxAvG6AXCuR65YzK8ua6D9hvi/TzUfZMpc+BwuM1IPw8fmQBiQ==",
+      "license": "MIT",
       "dependencies": {
         "accepts": "~1.3.8",
         "array-flatten": "1.1.1",
         "body-parser": "1.20.3",
         "content-disposition": "0.5.4",
         "content-type": "~1.0.4",
-        "cookie": "0.6.0",
+        "cookie": "0.7.1",
         "cookie-signature": "1.0.6",
         "debug": "2.6.9",
         "depd": "2.0.0",
@@ -8880,9 +8882,9 @@
       "dev": true
     },
     "cookie": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.6.0.tgz",
-      "integrity": "sha512-U71cyTamuh1CRNCfpGY6to28lxvNwPG4Guz/EVjgf3Jmzv0vlDp1atT9eS5dDjMYHucpHbWns6Lwf3BKz6svdw=="
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.1.tgz",
+      "integrity": "sha512-6DnInpx7SJ2AK3+CTUE/ZM0vWTUboZCegxhC2xiIydHR9jNuTAASBrfEpHhiGOZw/nX51bHt6YQl8jsGo4y/0w=="
     },
     "cookie-signature": {
       "version": "1.0.6",
@@ -9435,16 +9437,16 @@
       "integrity": "sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q=="
     },
     "express": {
-      "version": "4.21.0",
-      "resolved": "https://registry.npmjs.org/express/-/express-4.21.0.tgz",
-      "integrity": "sha512-VqcNGcj/Id5ZT1LZ/cfihi3ttTn+NJmkli2eZADigjq29qTlWi/hAQ43t/VLPq8+UX06FCEx3ByOYet6ZFblng==",
+      "version": "4.21.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.21.1.tgz",
+      "integrity": "sha512-YSFlK1Ee0/GC8QaO91tHcDxJiE/X4FbpAyQWkxAvG6AXCuR65YzK8ua6D9hvi/TzUfZMpc+BwuM1IPw8fmQBiQ==",
       "requires": {
         "accepts": "~1.3.8",
         "array-flatten": "1.1.1",
         "body-parser": "1.20.3",
         "content-disposition": "0.5.4",
         "content-type": "~1.0.4",
-        "cookie": "0.6.0",
+        "cookie": "0.7.1",
         "cookie-signature": "1.0.6",
         "debug": "2.6.9",
         "depd": "2.0.0",