fix: Make loki work with multiple systems

fix #35

config/default.nix

@@ -5,10 +5,10 @@
     ./nix.nix
     ./sops.nix
     ./wireguard.nix
-    ./services/loki.nix
     ./home.nix
     ./services/restic.nix
     ./specialization.nix
+    ./services/promtail.nix
   ];
   services.openssh.enable = true;
   environment.systemPackages = with pkgs; [ git pinentry-curses ];

config/nixos-8gb-fsn1-1.nix

@@ -20,6 +20,7 @@
     ./services/minecraft.nix
     ./services/nix-cache.nix
     ./services/minio.nix
+    ./services/loki.nix
   ];
 
   boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "virtio_scsi" "xhci_pci" "sd_mod" "sr_mod" ];

config/services/loki.nix

@@ -1,19 +1,8 @@
-{ pkgs, ... }:
-
+{ ... }:
 {
   services.loki = {
     enable = true;
     configFile = ./loki.yaml;
   };
-  systemd.services.promtail = {
-    description = "Promtail service for Loki";
-    wantedBy = [ "multi-user.target" ];
-
-    serviceConfig = {
-      ExecStart = ''
-        ${pkgs.grafana-loki}/bin/promtail --config.file ${./promtrail.yaml}
-      '';
-    };
-  };
   networking.firewall.interfaces."wg0".allowedTCPPorts = [ 3100 ];
 }

config/services/promtail.nix

@@ -0,0 +1,42 @@
+{ config, pkgs, lib, ... }:
+let promtail_config = {
+  server = {
+    http_listen_port = 28183;
+    grpc_listen_port = 0;
+  };
+  positions = {
+    filename = "/tmp/positions.yaml";
+  };
+  client = {
+    url = "http://[fd0d:a262:1fa6:e621:b4e1:08ff:e658:6f49]:3100/loki/api/v1/push";
+    external_labels.host = config.networking.hostName;
+  };
+  scrapeConfigs = [
+    {
+      job_name = "journal";
+      journal = {
+        max_age = "12h";
+        labels.job = "systemd-journal";
+      };
+      relabel_configs = [
+        {
+          source_labels = [ "__journal__systemd_unit" ];
+          target_label = "unit";
+        }
+      ];
+    }
+  ];
+};
+in
+{
+  systemd.services.promtail = {
+    description = "Promtail service for Loki";
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.grafana-loki}/bin/promtail --config.file ${lib.generators.toYAML ./promtrail.yaml}
+      '';
+    };
+  };
+}

config/services/promtrail.yaml

@@ -1,24 +0,0 @@
-server:
-  http_listen_port: 28183
-  grpc_listen_port: 0
-
-positions:
-  filename: /tmp/positions.yaml
-
-clients:
-  - url: http://[fd0d:a262:1fa6:e621:b4e1:08ff:e658:6f49]:3100/loki/api/v1/push
-    external_labels:
-      host: nixos-8gb-fsn1-1
-  - url: http://[fd0d:a262:1fa6:e621:47e6:24d4:2acb:9437]:3100/loki/api/v1/push
-    external_labels:
-      host: nutty-noon
-
-scrape_configs:
-  - job_name: journal
-    journal:
-      max_age: 12h
-      labels:
-        job: systemd-journal
-    relabel_configs:
-      - source_labels: ["__journal__systemd_unit"]
-        target_label: "unit"