From fadfacaf2d080498c1355be11db6fb217abf470f Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Thu, 26 Jan 2023 13:46:21 -0600
Subject: [PATCH] add clustering

---
 config/runtime.exs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/config/runtime.exs b/config/runtime.exs
index 2cdfa3c..241a7df 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -71,6 +71,23 @@ if config_env() == :prod do
     aprs_is_login_id: System.get_env("APRS_CALLSIGN"),
     aprs_is_password: System.get_env("APRS_PASSCODE")
 
+  app_name =
+    System.get_env("FLY_APP_NAME") ||
+      raise "FLY_APP_NAME not available"
+
+  config :libcluster,
+    debug: true,
+    topologies: [
+      fly6pn: [
+        strategy: Cluster.Strategy.DNSPoll,
+        config: [
+          polling_interval: 5_000,
+          query: "#{app_name}.internal",
+          node_basename: app_name
+        ]
+      ]
+    ]
+
   # ## SSL Support
   #
   # To get SSL working, you will need to add the `https` key