ma netdata: init

1 files changed, 150 insertions, 0 deletions

diff --git a/makefu/3modules/netdata.nix b/makefu/3modules/netdata.nix
new file mode 100644
index 000000000..3ed33643c
--- /dev/null
+++ b/makefu/3modules/netdata.nix
@@ -0,0 +1,150 @@
+{ config, lib, pkgs, ... }:
+
+# fork of https://github.com/Mic92/dotfiles/blob/master/nixos/vms/modules/netdata.nix
+with lib;
+let
+  cfg = config.makefu.netdata;
+in
+{
+  options.makefu.netdata = {
+    enable = mkEnableOption "netdata";
+
+    # TODO only apikey from file, set remote host manually
+    stream.file = mkOption {
+      type = types.str;
+      default = toString <secrets/netdata-stream.conf>;
+      description = "path to stream data file";
+    };
+    stream.role = mkOption {
+      type = types.enum [ "master" "slave" ];
+      default = "slave";
+      description = "Wether to stream data";
+    };
+
+    httpcheck.checks = mkOption {
+      type = types.attrsOf (types.submodule ({
+        options = {
+          url = mkOption {
+            type = types.str;
+            example = "https://thalheim.io";
+            description = "Url to check";
+          };
+          regex = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            example = "My homepage";
+            description = "Regex that is matched against the returned content";
+          };
+          statusAccepted = mkOption {
+            type = types.listOf types.int;
+            default = [ 200 ];
+            example = [ 401 ];
+            description = "Expected http status code";
+          };
+        };
+      }));
+      default = {};
+      description = ''
+        httpcheck plugin: https://github.com/netdata/netdata/blob/master/collectors/python.d.plugin/httpcheck/httpcheck.conf
+      '';
+    };
+
+    portcheck.checks = mkOption {
+      type = types.attrsOf (types.submodule ({
+        options = {
+          host = mkOption {
+            type = types.str;
+            default = "127.0.0.1";
+            description = "Dns name/IP to check";
+          };
+          port = mkOption {
+            type = types.int;
+            description = "Tcp port number";
+          };
+        };
+      }));
+      default = {};
+      description = ''
+        portcheck plugin: https://github.com/netdata/netdata/tree/master/collectors/python.d.plugin/portcheck
+      '';
+    };
+  };
+  config = mkIf cfg.enable {
+    systemd.services.netdata = {
+      requires = [ "secret.service" ];
+      after = [ "secret.service" ];
+    };
+    krebs.secret.files.netdata-stream = {
+      path = "/run/secret/netdata-stream.conf";
+      owner.name = "netdata";
+      source-path = cfg.stream.file;
+    };
+    environment.etc."netdata/stream.conf".source = "/run/secret/netdata-stream.conf";
+
+    services.netdata = {
+      enable = true;
+      config = {
+        global = {
+          "bind to" = "0.0.0.0:19999 [::]:19999";
+          "error log" = "stderr";
+          "update every" = "5";
+        };
+        health.enable = if cfg.stream.role == "master" then "yes" else "no";
+      };
+    };
+  services.netdata.python.extraPackages = ps: [
+    ps.psycopg2 ps.docker ps.dnspython
+  ];
+
+    makefu.netdata.portcheck.checks.openssh.port = (lib.head config.services.openssh.ports);
+
+    networking.firewall.allowedTCPPorts = [ 19999 ];
+
+    environment.etc."netdata/python.d/httpcheck.conf".text = ''
+    update_every: 30
+    ${lib.concatStringsSep "\n" (mapAttrsToList (site: options:
+    ''
+      ${site}:
+        url: '${options.url}'
+        ${optionalString (options.regex != null) "regex: '${options.regex}'"}
+        status_accepted: [ ${lib.concatStringsSep " " (map toString options.statusAccepted) } ]
+      '') cfg.httpcheck.checks)
+      }
+    '';
+
+    environment.etc."netdata/python.d/portcheck.conf".text = ''
+    ${lib.concatStringsSep "\n" (mapAttrsToList (service: options:
+    ''
+      ${service}:
+        host: '${options.host}'
+        port: ${toString options.port}
+      '') cfg.portcheck.checks)
+      }
+    '';
+    systemd.services.netdata.restartTriggers = [
+      config.environment.etc."netdata/python.d/httpcheck.conf".source
+      config.environment.etc."netdata/python.d/portcheck.conf".source
+      config.environment.etc."netdata/stream.conf".source
+    ];
+
+    environment.etc."netdata/health.d/httpcheck.conf".text = ''
+      # taken from the original but warn only if a request is at least 300ms slow
+      template: web_service_slow
+      families: *
+      on: httpcheck.responsetime
+      lookup: average -3m unaligned of time
+      units: ms
+      every: 10s
+      warn: ($this > ($1h_web_service_response_time * 4) && $this > 1000)
+      crit: ($this > ($1h_web_service_response_time * 6) && $this > 1000)
+      info: average response time over the last 3 minutes, compared to the average over the last hour
+      delay: down 5m multiplier 1.5 max 1h
+      options: no-clear-notification
+      to: webmaster
+    '';
+
+  };
+  # TODO: notification
+  # environment.etc."netdata/health_alarm_notify.conf".source = "/run/keys/netdata-pushover.conf";
+
+}