add loki

modules/services/grafana.nix

@@ -87,4 +87,44 @@ in
   #  metrics-addr = "127.0.0.1:9323";
   #  experimental = true;
   #};
+
+  # Logs
+  services.loki = {
+    enable = true;
+    dataDir = "/mnt/250ssd/loki";
+    configFile = ./grafana/loki.yml;
+  };
+
+  services.promtail = {
+    enable = true;
+    configuration = {
+      server = {
+        http_listen_port = 28183;
+        grpc_listen_port = 0;
+        log_level = "warn";
+      };
+      positions.filename = "/tmp/positions.yaml";
+      clients = [
+        { url = "http://127.0.0.1:3100/loki/api/v1/push"; }
+      ];
+      scrape_configs = [
+        {
+          job_name = "journal";
+          journal = {
+            max_age = "24h";
+            labels = {
+              job = "systemd-journal";
+              host = "127.0.0.1";
+            };
+          };
+          relabel_configs = [
+            {
+              source_labels = [ "__journal__systemd_unit" ];
+              target_label = "unit";
+            }
+          ];
+        }
+      ];
+    };
+  };
 }

modules/services/grafana/loki.yml

@@ -0,0 +1,29 @@
+
+# This is a complete configuration to deploy Loki backed by the filesystem.
+# The index will be shipped to the storage via tsdb-shipper.
+
+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+
+common:
+  ring:
+    instance_addr: 127.0.0.1
+    kvstore:
+      store: inmemory
+  replication_factor: 1
+  path_prefix: /mnt/250ssd/loki/common
+
+schema_config:
+  configs:
+  - from: 2020-05-15
+    store: tsdb
+    object_store: filesystem
+    schema: v13
+    index:
+      prefix: index_
+      period: 24h
+
+analytics:
+  reporting_enabled: false