nixos-module/collectd: add unbound.rb

nix/nixos-module/collectd/default.nix

@@ -66,6 +66,10 @@ in
         in ''
           Exec "collectd" "${pkgs.ruby}/bin/ruby" "${./dhcpcount.rb}" "${toString maxTimeout}"
         '';
+    }) (lib.optionalAttrs config.services.unbound.enable {
+      exec = ''
+        Exec "collectd" "${pkgs.ruby}/bin/ruby" "${./unbound.rb}"
+      '';
     }) ];
   };
 }

nix/nixos-module/collectd/unbound.rb

@@ -0,0 +1,20 @@
+loop do
+  `/run/current-system/sw/bin/unbound-control stats_noreset`
+    .lines
+    .filter { |l| l =~ /^total\./ }
+    .each { |l|
+    if l =~ /total\.(.+?)=([\d\.]+)/
+      name = $1
+      value = $2.to_f
+      if name =~ /\.avg$/ || name =~ /\.median$/ || name =~ /\.max$/ || name =~ /\.min$/
+        ty = "gauge"
+      else
+        ty = "derive"
+        value = value.to_i
+      end
+      puts "PUTVAL dnscache/unbound/#{ty}-#{name} N:#{value}"
+    end
+  }
+
+  sleep 10
+end

nix/nixos-module/container/dnscache.nix

@@ -19,6 +19,10 @@ lib.mkIf config.site.hosts.${hostName}.services.dnscache.enable {
       "127.0.0.0/8"
     ];
     extraConfig = ''
+      remote-control:
+        control-enable: yes
+        control-use-cert: no
+
       forward-zone:
         name: "."
         forward-tls-upstream: yes