diff --git a/Dockerfile b/Dockerfile
index dd6fed9fd..0eb17609a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,6 +39,7 @@ EXPOSE 3000
 EXPOSE 3001
 EXPOSE 3002
 EXPOSE 3005
+EXPOSE 9229
 WORKDIR /opt/one-app
 RUN chown node:node /opt/one-app
 USER $USER
diff --git a/__tests__/server/config/env/runTime.spec.js b/__tests__/server/config/env/runTime.spec.js
index 818a1eb19..f27c5b139 100644
--- a/__tests__/server/config/env/runTime.spec.js
+++ b/__tests__/server/config/env/runTime.spec.js
@@ -40,6 +40,7 @@ describe('runTime', () => {
     'HOLOCRON_MODULE_MAP_URL',
     'HTTP_ONE_APP_DEV_CDN_PORT',
     'HTTP_ONE_APP_DEV_PROXY_SERVER_PORT',
+    'HTTP_ONE_APP_DEBUG_PORT',
     'HOLOCRON_SERVER_MAX_MODULES_RETRY',
     'HOLOCRON_SERVER_MAX_SIM_MODULES_FETCH',
     'ONE_CLIENT_REPORTING_URL',
@@ -247,6 +248,35 @@ describe('runTime', () => {
     });
   });
 
+  describe('HTTP_ONE_APP_DEBUG_PORT', () => {
+    const debugPort = getEnvVarConfig('HTTP_ONE_APP_DEBUG_PORT');
+
+    it('normalizes numeric input', () => {
+      expect(debugPort.normalize('1337')).toEqual(1337);
+      expect(() => debugPort.normalize('r00t')).toThrowErrorMatchingInlineSnapshot(
+        '"env var HTTP_ONE_APP_DEBUG_PORT needs to be a valid integer, given \\"r00t\\""'
+      );
+      expect(debugPort.normalize('0002345')).toEqual(2345);
+      expect(() => debugPort.normalize('0002345a')).toThrow();
+    });
+
+    it('does not normalize if no value is given', () => {
+      expect(debugPort.normalize()).toEqual(undefined);
+    });
+
+    it('has a default value for development', () => {
+      process.env.NODE_ENV = 'development';
+      delete process.env.HTTP_ONE_APP_DEV_CDN_PORT;
+      expect(debugPort.defaultValue()).toBeDefined();
+      expect(debugPort.defaultValue()).toBe(9229);
+    });
+
+    it('has no default value for production', () => {
+      process.env.NODE_ENV = 'production';
+      expect(debugPort.defaultValue()).not.toBeDefined();
+    });
+  });
+
   describe('HTTP_METRICS_PORT', () => {
     const httpPort = getEnvVarConfig('HTTP_METRICS_PORT');
 
diff --git a/src/server/config/env/runTime.js b/src/server/config/env/runTime.js
index c98a8859a..703c71a53 100644
--- a/src/server/config/env/runTime.js
+++ b/src/server/config/env/runTime.js
@@ -129,6 +129,25 @@ const runTime = [
       ? 3002
       : undefined),
   },
+  {
+    name: 'HTTP_ONE_APP_DEBUG_PORT',
+    normalize: (input) => {
+      if (input) {
+        const parsed = Number.parseInt(input, 10);
+        // make sure the parsed value is the same value as input
+        // input may be a string or a number, we don't want === in this case, just ==
+        if (Number.isNaN(parsed) || parsed != input) { // eslint-disable-line eqeqeq
+          throw new Error(`env var HTTP_ONE_APP_DEBUG_PORT needs to be a valid integer, given "${input}"`);
+        } else {
+          return parsed;
+        }
+      }
+      return undefined;
+    },
+    defaultValue: () => (process.env.NODE_ENV === 'development'
+      ? 9229
+      : undefined),
+  },
   // holocron config, the modules to use
   {
     name: 'HOLOCRON_MODULE_MAP_URL',