home lab init

nixos/modules/promtail.nix

@@ -0,0 +1,43 @@
+{ config, pkgs, ... }:
+let
+  promtail_port = 9080;
+in
+{
+  networking.firewall.allowedTCPPorts = [ promtail_port ];
+
+  systemd.tmpfiles.rules = [
+    "d /var/lib/promtail 0755 promtail promtail -"
+  ];
+
+  services.promtail = {
+    enable = true;
+    configuration = {
+      server = {
+        http_listen_port = promtail_port;
+        grpc_listen_port = 0;
+      };
+      positions = {
+        filename = "/var/lib/promtail/positions.yaml";
+      };
+      clients = [{
+        url = "http://monitor.local:3100/loki/api/v1/push";
+      }];
+      scrape_configs = [{
+        job_name = "journal";
+        journal = {
+          path = "/var/log/journal";
+          labels = {
+            job = "promtail";
+            host = config.networking.hostName;
+            env = "proxmox";
+            instance = "${config.networking.hostName}.local";
+          };
+        };
+        relabel_configs = [{
+          source_labels = ["__journal__systemd_unit"];
+          target_label = "unit";
+        }];
+      }];
+    };
+  };
+}