From 78e13fc7069875b6101b517fb0bff1fe72835cfb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sun, 18 Dec 2022 13:39:13 +0100
Subject: Add monitoring

---
 nixos/modules/default.nix    |  1 +
 nixos/modules/develop.nix    |  1 +
 nixos/modules/monitoring.nix | 92 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 nixos/modules/monitoring.nix

(limited to 'nixos')

diff --git a/nixos/modules/default.nix b/nixos/modules/default.nix
index fd60aa4..8bf6a31 100644
--- a/nixos/modules/default.nix
+++ b/nixos/modules/default.nix
@@ -6,6 +6,7 @@ nixpkgs: {
   cynerd-gaming = import ./gaming.nix;
   cynerd-generic = import ./generic.nix;
   cynerd-hosts = import ./hosts.nix;
+  cynerd-monitoring = import ./monitoring.nix;
   cynerd-openvpn = import ./openvpn.nix;
   cynerd-syncthing = import ./syncthing.nix;
   cynerd-wifi-client = import ./wifi-client.nix;
diff --git a/nixos/modules/develop.nix b/nixos/modules/develop.nix
index c1c15b2..fa91d02 100644
--- a/nixos/modules/develop.nix
+++ b/nixos/modules/develop.nix
@@ -59,6 +59,7 @@ in {
         jinja2
         ruamel-yaml
         msgpack
+        urllib3 influxdb-client
 
         psycopg
 
diff --git a/nixos/modules/monitoring.nix b/nixos/modules/monitoring.nix
new file mode 100644
index 0000000..247253e
--- /dev/null
+++ b/nixos/modules/monitoring.nix
@@ -0,0 +1,92 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+cnf = config.cynerd.monitoring;
+hostName = config.networking.hostName;
+isHost = cnf.host == hostName;
+
+in {
+  options.cynerd.monitoring = {
+    enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = "If monitoring should be used";
+    };
+    hw = mkOption {
+      type = types.bool;
+      default = true;
+      description = "If hardware should be reported";
+    };
+
+    host = mkOption {
+      type = types.str;
+      description = "Host name of the monitoring hosting system";
+      readOnly = true;
+    };
+  };
+
+  config = mkMerge [
+    { cynerd.monitoring.host = "ridcully"; }
+    (mkIf cnf.enable {
+      # Telegraf configuration
+      services.telegraf = {
+        enable = true;
+        environmentFiles = ["/run/secrets/telegraf.env"];
+        extraConfig = {
+          agent = {};
+          outputs.influxdb_v2 = {
+            urls = ["http://${cnf.host}:8086"];
+            token = "$INFLUX_TOKEN";
+            organization = "personal";
+            bucket = "monitoring";
+          };
+          inputs = {
+            cpu = {
+              percpu = true;
+              totalcpu = true;
+            };
+            disk = {
+              ignore_fs = [
+                "tmpfs" "devtmpfs" "devfs" "iso9660" "overlay" "aufs" "squashfs"
+              ];
+            };
+            diskio = {};
+            diskio = {};
+            mem = {};
+            net = {};
+            processes = {};
+            swap = {};
+            system = {};
+          } // (optionalAttrs cnf.hw {
+            sensors = {};
+            smart = {};
+          });
+        };
+      };
+      # TODO probably add this to the upstream configuration
+      systemd.services.telegraf.path = with pkgs; [
+      ] ++ (optionals cnf.hw [
+        nvme-cli lm_sensors smartmontools
+      ]);
+    })
+    (mkIf isHost {
+      # InfluxDB
+      services.influxdb2.enable = mkIf isHost true;
+      # Grafana
+      services.grafana = mkIf isHost {
+        enable = true;
+        settings = {
+          users.allow_sign_up = false;
+          security = {
+            admin_user = "cynerd";
+            admin_password = "$__file{/run/secrets/grafana.admin.pass}";
+          };
+        };
+      };
+
+    })
+  ];
+}
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