From 6e592faa92dc2b9fabbe413e9430da632c376cb3 Mon Sep 17 00:00:00 2001
From: Izorkin <izorkin@elven.pw>
Date: Fri, 5 Jul 2019 12:11:44 +0300
Subject: [PATCH 1/2] nixos/netdata: enable reload service and add PID file

---
 nixos/modules/services/monitoring/netdata.nix | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/services/monitoring/netdata.nix b/nixos/modules/services/monitoring/netdata.nix
index f264b6dd4565..978dbd28d857 100644
--- a/nixos/modules/services/monitoring/netdata.nix
+++ b/nixos/modules/services/monitoring/netdata.nix
@@ -141,11 +141,16 @@ in {
       path = (with pkgs; [ gawk curl ]) ++ lib.optional cfg.python.enable
         (pkgs.python3.withPackages cfg.python.extraPackages);
       serviceConfig = {
+        Environment="PYTHONPATH=${pkgs.netdata}/libexec/netdata/python.d/python_modules";
+        ExecStart = "${pkgs.netdata}/bin/netdata -P /run/netdata/netdata.pid -D -c ${configFile}";
+        ExecReload = "${pkgs.utillinux}/bin/kill -s HUP -s USR1 -s USR2 $MAINPID";
+        TimeoutStopSec = 60;
+        # User and group
         User = cfg.user;
         Group = cfg.group;
-        Environment="PYTHONPATH=${pkgs.netdata}/libexec/netdata/python.d/python_modules";
-        ExecStart = "${pkgs.netdata}/bin/netdata -D -c ${configFile}";
-        TimeoutStopSec = 60;
+        # Runtime directory and mode
+        RuntimeDirectory = "netdata";
+        RuntimeDirectoryMode = "0755";
       };
     };
 

From fb4d71a39fdf0ef2477870c4f720bab10bf90174 Mon Sep 17 00:00:00 2001
From: Izorkin <izorkin@elven.pw>
Date: Fri, 5 Jul 2019 22:15:38 +0300
Subject: [PATCH 2/2] nixos/netdata: increase performance

---
 nixos/modules/services/monitoring/netdata.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixos/modules/services/monitoring/netdata.nix b/nixos/modules/services/monitoring/netdata.nix
index 978dbd28d857..f9b7550af23a 100644
--- a/nixos/modules/services/monitoring/netdata.nix
+++ b/nixos/modules/services/monitoring/netdata.nix
@@ -151,6 +151,8 @@ in {
         # Runtime directory and mode
         RuntimeDirectory = "netdata";
         RuntimeDirectoryMode = "0755";
+        # Performance
+        LimitNOFILE = "30000";
       };
     };
 
@@ -170,6 +172,11 @@ in {
       permissions = "u+rx,g+rx,o-rwx";
     };
 
+    security.pam.loginLimits = [
+      { domain = "netdata"; type = "soft"; item = "nofile"; value = "10000"; }
+      { domain = "netdata"; type = "hard"; item = "nofile"; value = "30000"; }
+    ];
+
     users.users = optional (cfg.user == defaultUser) {
       name = defaultUser;
     };