3 files changed, 232 insertions, 0 deletions
diff --git a/krebs/2configs/shack/prometheus/node.nix b/krebs/2configs/shack/prometheus/node.nix
new file mode 100644
index 000000000..5462464d5
--- /dev/null
+++ b/krebs/2configs/shack/prometheus/node.nix
@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+{
+  networking.firewall.allowedTCPPorts = [ 9100 ];
+
+  services.prometheus.exporters.node = {
+    enable = true;
+    enabledCollectors = [
+      "conntrack"
+      "diskstats"
+      "entropy"
+      "filefd"
+      "filesystem"
+      "loadavg"
+      "mdadm"
+      "meminfo"
+      "netdev"
+      "netstat"
+      "stat"
+      "time"
+      "vmstat"
+      "systemd"
+      "logind"
+      "interrupts"
+      "ksmd"
+    ];
+  };
+}
diff --git a/krebs/2configs/shack/prometheus/server.nix b/krebs/2configs/shack/prometheus/server.nix
new file mode 100644
index 000000000..c936f2531
--- /dev/null
+++ b/krebs/2configs/shack/prometheus/server.nix
@@ -0,0 +1,195 @@
+{ pkgs, lib, config, ... }:
+# from https://gist.github.com/globin/02496fd10a96a36f092a8e7ea0e6c7dd
+{
+  networking = {
+    firewall.allowedTCPPorts = [
+      3000  # grafana
+      9090  # prometheus
+      9093  # alertmanager
+    ];
+    useDHCP = true;
+  };
+
+  services = {
+    prometheus = {
+      enable = true;
+      extraFlags = [
+        "-storage.local.retention 8760h"
+        "-storage.local.series-file-shrink-ratio 0.3"
+        "-storage.local.memory-chunks 2097152"
+        "-storage.local.max-chunks-to-persist 1048576"
+        "-storage.local.index-cache-size.fingerprint-to-metric 2097152"
+        "-storage.local.index-cache-size.fingerprint-to-timerange 1048576"
+        "-storage.local.index-cache-size.label-name-to-label-values 2097152"
+        "-storage.local.index-cache-size.label-pair-to-fingerprints 41943040"
+      ];
+      alertmanagerURL = [ "http://localhost:9093" ];
+      rules = [
+        ''
+          ALERT node_down
+          IF up == 0
+          FOR 5m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: Node is down.",
+            description = "{{$labels.alias}} has been down for more than 5 minutes."
+          }
+          ALERT node_systemd_service_failed
+          IF node_systemd_unit_state{state="failed"} == 1
+          FOR 4m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: Service {{$labels.name}} failed to start.",
+            description = "{{$labels.alias}} failed to (re)start service {{$labels.name}}."
+          }
+          ALERT node_filesystem_full_90percent
+          IF sort(node_filesystem_free{device!="ramfs"} < node_filesystem_size{device!="ramfs"} * 0.1) / 1024^3
+          FOR 5m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: Filesystem is running out of space soon.",
+            description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} got less than 10% space left on its filesystem."
+          }
+          ALERT node_filesystem_full_in_4h
+          IF predict_linear(node_filesystem_free{device!="ramfs"}[1h], 4*3600) <= 0
+          FOR 5m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: Filesystem is running out of space in 4 hours.",
+            description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 4 hours"
+          }
+          ALERT node_filedescriptors_full_in_3h
+          IF predict_linear(node_filefd_allocated[1h], 3*3600) >= node_filefd_maximum
+          FOR 20m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}} is running out of available file descriptors in 3 hours.",
+            description = "{{$labels.alias}} is running out of available file descriptors in approx. 3 hours"
+          }
+          ALERT node_load1_90percent
+          IF node_load1 / on(alias) count(node_cpu{mode="system"}) by (alias) >= 0.9
+          FOR 1h
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: Running on high load.",
+            description = "{{$labels.alias}} is running with > 90% total load for at least 1h."
+          }
+          ALERT node_cpu_util_90percent
+          IF 100 - (avg by (alias) (irate(node_cpu{mode="idle"}[5m])) * 100) >= 90
+          FOR 1h
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary = "{{$labels.alias}}: High CPU utilization.",
+            description = "{{$labels.alias}} has total CPU utilization over 90% for at least 1h."
+          }
+          ALERT node_ram_using_90percent
+          IF node_memory_MemFree + node_memory_Buffers + node_memory_Cached < node_memory_MemTotal * 0.1
+          FOR 30m
+          LABELS {
+            severity="page"
+          }
+          ANNOTATIONS {
+            summary="{{$labels.alias}}: Using lots of RAM.",
+            description="{{$labels.alias}} is using at least 90% of its RAM for at least 30 minutes now.",
+          }
+        ''
+      ];
+      scrapeConfigs = [
+        {
+          job_name = "node";
+          scrape_interval = "10s";
+          static_configs = [
+            {
+              targets = [
+                "localhost:9100"
+              ];
+              labels = {
+                alias = "wolf.shack";
+              };
+            }
+            {
+              targets = [
+                "localhost:9130"
+              ];
+              labels = {
+                alias = "unifi.shack";
+              };
+            }
+            {
+              targets = [
+                "10.42.22.184:9100" # puyak.shack
+              ];
+              labels = {
+                alias = "puyak.shack";
+              };
+            }
+            {
+              targets = [
+                "phenylbutazon.shack:9100"
+              ];
+              labels = {
+                alias = "phenylbutazon.shack";
+              };
+            }
+            {
+              targets = [
+                "ibuprofen.shack:9100"
+              ];
+              labels = {
+                alias = "ibuprofen.shack";
+              };
+            }
+          ];
+        }
+      ];
+      alertmanager = {
+        enable = true;
+        listenAddress = "0.0.0.0";
+        configuration = {
+          "global" = {
+            "smtp_smarthost" = "smtp.example.com:587";
+            "smtp_from" = "alertmanager@example.com";
+          };
+          "route" = {
+            "group_by" = [ "alertname" "alias" ];
+            "group_wait" = "30s";
+            "group_interval" = "2m";
+            "repeat_interval" = "4h";
+            "receiver" = "team-admins";
+          };
+          "receivers" = [
+            {
+              "name" = "team-admins";
+              "email_configs" = [
+                {
+                  "to" = "devnull@example.com";
+                  "send_resolved" = true;
+                }
+              ];
+              "webhook_configs" = [
+                {
+                  "url" = "https://example.com/prometheus-alerts";
+                  "send_resolved" = true;
+                }
+              ];
+            }
+          ];
+        };
+      };
+    };
+  };
+}
diff --git a/krebs/2configs/shack/prometheus/unifi.nix b/krebs/2configs/shack/prometheus/unifi.nix
new file mode 100644
index 000000000..401ecb024
--- /dev/null
+++ b/krebs/2configs/shack/prometheus/unifi.nix
@@ -0,0 +1,10 @@
+{lib, ... }:
+{
+  services.prometheus.exporters.unifi = {
+    enable = true;
+    unifiAddress = "https://unifi.shack:8443/";
+    unifiInsecure = true;
+    unifiUsername = "prometheus"; # needed manual login after setup to confirm the password
+    unifiPassword = lib.replaceChars ["\n"] [""] (builtins.readFile <secrets/shack/unifi-prometheus-pw>);
+  };
+}