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nixfiles/modules/monitoring/default.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.clerie.monitoring;
monitoring-network-base = "fd00:327:327:327::";
in
{
options = {
clerie.monitoring = {
enable = mkEnableOption "clerie's Monitoring";
id = mkOption {
type = types.str;
description = "ID of the Monitoring Interface (it is actually a part of an ip address)";
};
pubkey = mkOption {
type = types.str;
description = "Public Key of the monitoring wireguard interface of this host";
};
serviceLevel = mkOption {
type = types.str;
default = "infra";
description = "Service level this instance is assigned to";
};
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bird = mkEnableOption "Monitor bird";
blackbox = mkEnableOption "Monitor blackbox";
nixos = mkOption {
type = types.bool;
default = true;
description = "Monitor NixOS";
};
};
};
config = mkIf cfg.enable {
networking.wireguard.enable = true;
networking.wireguard.interfaces = {
wg-monitoring = {
ips = [ "${monitoring-network-base}${cfg.id}/64" ];
peers = [
{
endpoint = "[2001:638:904:ffca::7]:54523";
persistentKeepalive = 25;
allowedIPs = [ "${monitoring-network-base}/64" ];
publicKey = "eyhJKV41E1F0gZHBNqyzUnj72xg5f3bdDduVtpPN4AY=";
}
];
privateKeyFile = config.age.secrets.wg-monitoring.path;
};
};
services.prometheus.exporters.node = {
enable = true;
#listenAddress = "${monitoring-network-base}${cfg.id}";
openFirewall = true;
firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9100";
enabledCollectors = [
"systemd"
];
};
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systemd.services."prometheus-node-exporter".serviceConfig.RestrictAddressFamilies = [ "AF_NETLINK" ];
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services.prometheus.exporters.bird = mkIf cfg.bird {
enable = true;
openFirewall = true;
firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9324";
};
services.prometheus.exporters.blackbox = mkIf cfg.blackbox {
enable = true;
openFirewall = true;
firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9115";
configFile = pkgs.writeText "blackbox.yml" ''
modules:
icmp6:
prober: icmp
icmp:
preferred_ip_protocol: ip6
ip_protocol_fallback: false
icmp4:
prober: icmp
icmp:
preferred_ip_protocol: ip4
ip_protocol_fallback: false
'';
};
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users.users."nixos-exporter" = {
isSystemUser = true;
group = "nixos-exporter";
};
users.groups."nixos-exporter" = {};
systemd.services."prometheus-nixos-exporter" = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
Restart = "always";
PrivateTmp = true;
WorkingDirectory = "/tmp";
RuntimeDirectory = "prometheus-nixos-exporter";
User = "nixos-exporter";
Group = "nixos-exporter";
ExecStart = ''
${pkgs.nixos-exporter}/bin/nixos-exporter --listen [::]:9152 exporter
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'';
};
};
networking.firewall.extraCommands = ''
ip46tables -A nixos-fw -i wg-monitoring -p tcp -m tcp --dport 9152 -m comment --comment nixos-exporter -j nixos-fw-accept
'';
};
}