diff --git a/.gitignore b/.gitignore
index 18f9b3b..5011ae1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -96,3 +96,6 @@ ENV/
 
 viera.yaml
 viera.jsonld
+
+relay.jsonld
+relay.yaml
diff --git a/Procfile b/Procfile
new file mode 100644
index 0000000..93b6f8b
--- /dev/null
+++ b/Procfile
@@ -0,0 +1 @@
+web: python -m relay
diff --git a/app.json b/app.json
new file mode 100644
index 0000000..087b641
--- /dev/null
+++ b/app.json
@@ -0,0 +1,16 @@
+{
+    "dokku": {
+        "volumes": [
+            {
+                "host": "/var/lib/dokku/data/storage/$APP/files",
+                "app": "/app/files",
+                "phases": "deploy,run"
+            }
+        ]
+    },
+    "scripts": {
+        "dokku": {
+            "predeploy": "./bin/pre-deploy"
+        }
+    }
+}
diff --git a/bin/pre-deploy b/bin/pre-deploy
new file mode 100755
index 0000000..51e37f6
--- /dev/null
+++ b/bin/pre-deploy
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+sed \
+  -e "s/__PORT__/${PORT:-5000}/g" \
+  -e "s/__HOSTNAME__/$HOSTNAME/g" \
+  relay_template.yaml > relay.yaml
diff --git a/relay/actor.py b/relay/actor.py
index a8d6613..0804897 100644
--- a/relay/actor.py
+++ b/relay/actor.py
@@ -35,7 +35,11 @@ from . import app, CONFIG
 from .remote_actor import fetch_actor
 
 
-AP_CONFIG = CONFIG.get('ap', {'host': 'localhost','blocked_instances':[]})
+AP_CONFIG = CONFIG.get('ap', {
+    'host': 'localhost',
+    'blocked_instances': [],
+    'allowed_instances': [],
+})
 CACHE_SIZE = CONFIG.get('cache-size', 16384)
 
 
@@ -218,6 +222,10 @@ async def handle_follow(actor, data, request):
     if urlsplit(inbox).hostname in AP_CONFIG['blocked_instances']:
         return
 
+    if AP_CONFIG['allowed_instances'] and\
+            urlsplit(inbox).hostname not in AP_CONFIG['allowed_instances']:
+        return
+
     if inbox not in following:
         following += [inbox]
         DATABASE['relay-list'] = following
diff --git a/relay/default.py b/relay/default.py
index b3a1836..6c84657 100644
--- a/relay/default.py
+++ b/relay/default.py
@@ -14,7 +14,7 @@ async def default(request):
         status=200,
         content_type="text/html",
         charset="utf-8",
-        text="""
+        text="""<!doctype html>
 <html><head>
  <title>ActivityPub Relay at {host}</title>
  <style>
diff --git a/relay/nodeinfo.py b/relay/nodeinfo.py
index 5556e14..11e7f39 100644
--- a/relay/nodeinfo.py
+++ b/relay/nodeinfo.py
@@ -1,3 +1,4 @@
+import os
 import subprocess
 import urllib.parse
 
@@ -10,7 +11,7 @@ from .database import DATABASE
 try:
     commit_label = subprocess.check_output(["git", "rev-parse", "HEAD"]).strip().decode('ascii')
 except:
-    commit_label = '???'
+    commit_label = os.environ.get('GIT_REV')
 
 
 nodeinfo_template = {
diff --git a/relay_template.yaml b/relay_template.yaml
new file mode 100644
index 0000000..7c8aec1
--- /dev/null
+++ b/relay_template.yaml
@@ -0,0 +1,23 @@
+# this is the path that the object graph will get dumped to (in JSON-LD format),
+# you probably shouldn't change it, but you can if you want.
+db: files/relay.jsonld
+
+# Listener
+listen: 0.0.0.0
+port: __PORT__
+
+# Note
+note: "Make a note about your instance here."
+
+# this section is for ActivityPub
+ap:
+  # this is used for generating activitypub messages, as well as instructions for
+  # linking AP identities.  it should be an SSL-enabled domain reachable by https.
+  host: '__HOSTNAME__'
+  blocked_instances: []
+  allowed_instances:
+    - edge.twingyeo.kr
+    - planet.moe
+    - qdon.space
+    - twingyeo.kr
+    - uri.life
