1 files changed, 102 insertions, 0 deletions
diff --git a/modules/nixos/loki.nix b/modules/nixos/loki.nix
new file mode 100644
index 0000000..1582164
--- /dev/null
+++ b/modules/nixos/loki.nix
@@ -0,0 +1,102 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.nixfiles.modules.loki;
+in {
+  options.nixfiles.modules.loki = {
+    enable = mkEnableOption "Loki";
+
+    port = mkOption {
+      description = "Port.";
+      type = with types; port;
+      default = 30171;
+    };
+
+    domain = mkOption {
+      description = "Domain name sans protocol scheme.";
+      type = with types; str;
+      default = "loki.${config.networking.domain}";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    nixfiles.modules.nginx = with cfg; {
+      enable = true;
+      upstreams.loki.servers."127.0.0.1:${toString cfg.port}" = {};
+      virtualHosts.${domain} = {
+        locations."/".proxyPass = "http://loki";
+        extraConfig = nginxInternalOnly;
+      };
+    };
+
+    services.loki = {
+      enable = true;
+
+      configuration = rec {
+        auth_enabled = false;
+
+        server = rec {
+          http_listen_address = "127.0.0.1";
+          http_listen_port = cfg.port;
+
+          grpc_listen_address = "127.0.0.1";
+          grpc_listen_port = http_listen_port + 1;
+
+          log_level = "warn";
+        };
+
+        common = rec {
+          path_prefix = "/var/lib/loki";
+          storage.filesystem = {
+            chunks_directory = "${path_prefix}/chunker";
+            rules_directory = "${path_prefix}/ruler";
+          };
+          replication_factor = 1;
+          instance_interface_names = ["lo"];
+          ring = {
+            instance_addr = "127.0.0.1";
+            kvstore.store = "inmemory";
+          };
+        };
+
+        ruler = {
+          rule_path = "${common.path_prefix}/ruler";
+          storage = {
+            type = "local";
+            local.directory =
+              pkgs.writeTextDir "ruler/ruler.yml"
+              (generators.toJSON {} {groups = [{name = "default";}];});
+          };
+        };
+
+        schema_config.configs = [
+          {
+            from = "2020-01-01";
+            store = "boltdb-shipper";
+            object_store = "filesystem";
+            schema = "v11";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+            chunks = {
+              prefix = "chunks_";
+              period = "24h";
+            };
+          }
+        ];
+
+        analytics.reporting_enabled = false;
+      };
+    };
+
+    systemd.tmpfiles.rules = [
+      "d /var/lib/loki 0700 loki loki - -"
+      "d /var/lib/loki/ruler 0700 loki loki - -"
+    ];
+  };
+}