service/loki: init

modules/services/default.nix

@@ -12,6 +12,7 @@
     ./homer
     ./initrd-ssh
     ./jellyfin
+    ./loki
     ./minecraft-server
     ./mumble-server
     ./navidrome

modules/services/loki/default.nix

@@ -0,0 +1,62 @@
+# log monitoring
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.services.loki;
+  domain = config.networking.domain;
+in
+{
+  options.my.services.loki = with lib; {
+    enable = mkEnableOption "loki log monitoring";
+
+    port = mkOption {
+      type = types.port;
+      default = 3100;
+      example = 3002;
+      description = "Internal port";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.loki = {
+      enable = true;
+      configuration = {
+        server = {
+          http_listen_address = "127.0.0.1";
+          http_listen_port = cfg.port;
+        };
+        auth_enabled = false;
+
+        common = {
+          ring = {
+            instance_addr = "127.0.0.1";
+            kvstore.store = "inmemory";
+          };
+          replication_factor = 1;
+          path_prefix = "/tmp/loki";
+        };
+
+        schema_config = {
+          configs = [{
+            from = "2020-05-15";
+            store = "boltdb-shipper";
+            object_store = "filesystem";
+            schema = "v11";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+          }];
+        };
+      };
+    };
+
+    services.grafana.provision.datasources.settings.datasources = [
+      {
+        name = "Loki";
+        type = "loki";
+        access = "proxy";
+        url = "http://localhost:${toString cfg.port}";
+      }
+    ];
+  };
+}