From c1991fb18d2a58eefeba0a49bb683eb4e561263f Mon Sep 17 00:00:00 2001
From: Daniel Schaefer <git@danielschaefer.me>
Date: Sun, 7 Apr 2019 07:22:41 +0200
Subject: [PATCH] nixos/cassandra: Add clusterName

---
 nixos/modules/services/databases/cassandra.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/nixos/modules/services/databases/cassandra.nix b/nixos/modules/services/databases/cassandra.nix
index f51bf824a5e2..3c5a47682686 100644
--- a/nixos/modules/services/databases/cassandra.nix
+++ b/nixos/modules/services/databases/cassandra.nix
@@ -9,6 +9,7 @@ let
     ({ commitlog_sync = "batch";
        commitlog_sync_batch_window_in_ms = 2;
        start_native_transport = cfg.allowClients;
+       cluster_name = cfg.clusterName;
        partitioner = "org.apache.cassandra.dht.Murmur3Partitioner";
        endpoint_snitch = "SimpleSnitch";
        seed_provider =
@@ -52,6 +53,15 @@ in {
     enable = mkEnableOption ''
       Apache Cassandra – Scalable and highly available database.
     '';
+    clusterName = mkOption {
+      type = types.str;
+      default = "NixOS Test Cluster";
+      description = ''
+        The name of the cluster.
+        This setting prevents nodes in one logical cluster from joining
+        another. All nodes in a cluster must have the same value.
+      '';
+    };
     user = mkOption {
       type = types.str;
       default = defaultUser;