arashi: init prometheus exporters

hosts/arashi/default.nix

@@ -3,6 +3,8 @@
     ./hardware-configuration.nix
     ./services
     ../../modules
+    ../../modules/prometheus/exporters/redis.nix
+    ../../modules/prometheus/exporters/postgres.nix
   ];
 
   boot.loader = {

modules/README.md

@@ -4,6 +4,7 @@ this directory hosts some common modules / services / security tweaks used on (m
 
 name            | description
 --------------- | -----------
+`prometheus`    | has default prometheus config for all hosts, along with exporters for select hosts
 `default`       | used for commonly shared modules
 `fonts`         | font handling
 `greetd`        | login manager

modules/default.nix

@@ -1,6 +1,7 @@
 {inputs, ...}: {
   imports = [
     inputs.nh.nixosModules.default
+    ./prometheus
     ./security.nix
     ./networking.nix
     ./users.nix
@@ -9,6 +10,5 @@
     ./openssh.nix
     ./virtualisation.nix
     ./sops.nix
-    ./prometheus.nix
   ];
 }

modules/prometheus/default.nix

@@ -5,19 +5,29 @@ _: {
     scrapeConfigs = [
       {
         job_name = "prometheus";
-        scrape_interval = "30s";
+        scrape_interval = "15s";
         static_configs = [{targets = ["localhost:9090"];}];
       }
       {
         job_name = "node";
-        scrape_interval = "30s";
+        scrape_interval = "15s";
         static_configs = [{targets = ["localhost:9100"];}];
       }
       {
         job_name = "traefik";
-        scrape_interval = "30s";
+        scrape_interval = "15s";
         static_configs = [{targets = ["100.87.54.48:8080"];}];
       }
+      {
+        job_name = "redis_exporter";
+        scrape_interval = "15s";
+        static_configs = [{targets = ["100.94.214.100:9002"];}];
+      }
+      {
+        job_name = "postgres";
+        scrape_interval = "15s";
+        static_configs = [{targets = ["100.94.214.100:9003"];}];
+      }
     ];
     exporters = {
       node = {

modules/prometheus/exporters/postgres.nix

@@ -0,0 +1,7 @@
+_: {
+  services.prometheus.exporters.postgres = {
+    enable = true;
+    openFirewall = true;
+    port = 9003;
+  };
+}

modules/prometheus/exporters/redis.nix

@@ -0,0 +1,7 @@
+_: {
+  services.prometheus.exporters.redis = {
+    enable = true;
+    openFirewall = true;
+    port = 9002;
+  };
+}