snmp: from package back to module

modules/services/default.nix

@@ -13,6 +13,7 @@
     ./node_exporter
     ./nsd-acme
     ./postfix
+    ./snmp_exporter
     ./syncthing
     ./zfsunlock
   ];

modules/services/snmp_exporter/README.md

@@ -0,0 +1,8 @@
+How to upgrade snmp.yml
+
+1. Extend generator.yml from the upstream generator.yml in snmp_exporter/generator/generator.yml
+2. Generate snmp.yml:
+
+    snmp_exporter/generator$ make mibs
+    packages/snmp-yaml $ MIBDIRS=$HOME/code/snmp_exporter/generator/mibs /nix/store/wmymig1r9jfiaffbdpv1lyaj32rydbzc-snmp_exporter-0.21.0/bin/generator generate
+

modules/services/snmp_exporter/default.nix

@@ -0,0 +1,21 @@
+{
+  config,
+  lib,
+  myData,
+  ...
+}: {
+  options.mj.services.snmp_exporter = with lib.types; {
+    enable = lib.mkEnableOption "Enable prometheus snmp_exporter";
+  };
+
+  config = lib.mkIf config.mj.services.snmp_exporter.enable {
+    mj.services.friendlyport.vpn.ports = [config.services.prometheus.exporters.snmp.port];
+
+    services.prometheus.exporters.snmp = {
+      enable = true;
+      listenAddress = "127.0.0.1";
+      configurationPath = ./snmp.yml;
+    };
+
+  };
+}

modules/services/snmp_exporter/generator.yml

@@ -0,0 +1,50 @@
+modules:
+  # Default IF-MIB interfaces table with ifIndex.
+  if_mib:
+    walk: [sysUpTime, interfaces, ifXTable]
+    lookups:
+      - source_indexes: [ifIndex]
+        lookup: ifAlias
+      - source_indexes: [ifIndex]
+        # Uis OID to avoid conflict with PaloAlto PAN-COMMON-MIB.
+        lookup: 1.3.6.1.2.1.2.2.1.2 # ifDescr
+      - source_indexes: [ifIndex]
+        # Use OID to avoid conflict with Netscaler NS-ROOT-MIB.
+        lookup: 1.3.6.1.2.1.31.1.1.1.1 # ifName
+    overrides:
+      ifAlias:
+        ignore: true # Lookup metric
+      ifDescr:
+        ignore: true # Lookup metric
+      ifName:
+        ignore: true # Lookup metric
+      ifType:
+        type: EnumAsInfo
+
+# Mikrotik Router
+#
+# http://download2.mikrotik.com/Mikrotik.mib
+  mikrotik:
+    walk:
+      - interfaces
+      - ifMIB
+      - laIndex
+      - sysUpTime
+      - sysDescr
+      - host
+      - mikrotik
+    lookups:
+      - source_indexes: [ifIndex]
+        lookup: ifName
+      - source_indexes: [mtxrInterfaceStatsIndex]
+        lookup: ifName
+      - source_indexes: [hrStorageIndex]
+        lookup: hrStorageDescr
+      - source_indexes: [laIndex]
+        lookup: laNames
+        drop_source_indexes: true
+    overrides:
+      ifName:
+        ignore: true # Lookup metric
+      ifType:
+        type: EnumAsInfo