l telegraf: update config
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lassulus
parent
32bac4e054
commit
ba79c70bbd
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@ -1,60 +1,127 @@
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{ config, lib, pkgs, ... }:
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{ pkgs, lib, config, ... }:
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# To use this module you also need to allow port 9273 either on the internet or on a vpn interface
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# i.e. networking.firewall.interfaces."vpn0".allowedTCPPorts = [ 9273 ];
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# Example prometheus alert rules:
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# - https://github.com/Mic92/dotfiles/blob/master/nixos/eva/modules/prometheus/alert-rules.nix
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let
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isVM = lib.any (mod: mod == "xen-blkfront" || mod == "virtio_console") config.boot.initrd.kernelModules;
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in {
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# potentially wrong if the nvme is not used at boot...
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hasNvme = lib.any (m: m == "nvme") config.boot.initrd.availableKernelModules;
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krebs.iptables.tables.filter.INPUT.rules = [
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{ predicate = "-i retiolum -p tcp --dport 9273"; target = "ACCEPT"; }
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];
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ipv6DadCheck = pkgs.writeShellScript "ipv6-dad-check" ''
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${pkgs.iproute2}/bin/ip --json addr | \
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${pkgs.jq}/bin/jq -r 'map(.addr_info) | flatten(1) | map(select(.dadfailed == true)) | map(.local) | @text "ipv6_dad_failures count=\(length)i"'
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'';
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systemd.services.telegraf.path = [ pkgs.nvme-cli ];
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zfsChecks = lib.optional
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(lib.any (fs: fs == "zfs") config.boot.supportedFilesystems)
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(pkgs.writeScript "zpool-health" ''
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#!${pkgs.gawk}/bin/awk -f
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BEGIN {
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while ("${pkgs.zfs}/bin/zpool status" | getline) {
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if ($1 ~ /pool:/) { printf "zpool_status,name=%s ", $2 }
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if ($1 ~ /state:/) { printf " state=\"%s\",", $2 }
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if ($1 ~ /errors:/) {
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if (index($2, "No")) printf "errors=0i\n"; else printf "errors=%di\n", $2
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}
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}
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}
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'');
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nfsChecks =
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let
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collectHosts = shares: fs:
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if builtins.elem fs.fsType [ "nfs" "nfs3" "nfs4" ]
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then
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shares
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// (
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let
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# also match ipv6 addresses
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group = builtins.match "\\[?([^\]]+)]?:([^:]+)$" fs.device;
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host = builtins.head group;
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path = builtins.elemAt group 1;
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in
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{
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${host} = (shares.${host} or [ ]) ++ [ path ];
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}
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)
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else shares;
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nfsHosts = lib.foldl collectHosts { } (builtins.attrValues config.fileSystems);
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in
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lib.mapAttrsToList
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(
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host: args:
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(pkgs.writeScript "nfs-health" ''
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#!${pkgs.gawk}/bin/awk -f
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BEGIN {
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for (i = 2; i < ARGC; i++) {
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mounts[ARGV[i]] = 1
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}
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while ("${pkgs.nfs-utils}/bin/showmount -e " ARGV[1] | getline) {
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if (NR == 1) { continue }
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if (mounts[$1] == 1) {
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printf "nfs_export,host=%s,path=%s present=1\n", ARGV[1], $1
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}
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delete mounts[$1]
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}
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for (mount in mounts) {
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printf "nfs_export,host=%s,path=%s present=0\n", ARGV[1], $1
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}
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}
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'')
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+ " ${host} ${builtins.concatStringsSep " " args}"
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)
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nfsHosts;
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in
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{
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systemd.services.telegraf.path = lib.optional (!isVM && hasNvme) pkgs.nvme-cli;
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services.telegraf = {
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enable = true;
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extraConfig = {
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agent.interval = "60s";
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inputs = {
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http_response = [
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{ urls = [
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"http://localhost:8080/about/health/"
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]; }
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prometheus.urls = lib.mkIf config.services.promtail.enable [
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# default promtail port
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"http://localhost:9080/metrics"
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];
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prometheus.metric_version = 2;
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kernel_vmstat = { };
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# smart = lib.mkIf (!isVM) {
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# path = pkgs.writeShellScript "smartctl" ''
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# exec /run/wrappers/bin/sudo ${pkgs.smartmontools}/bin/smartctl "$@"
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# '';
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# };
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nginx.urls = lib.mkIf config.services.nginx.statusPage [
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"http://localhost/nginx_status"
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];
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smart = lib.mkIf (!isVM) {
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path_smartctl = pkgs.writeShellScript "smartctl" ''
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exec /run/wrappers/bin/sudo ${pkgs.smartmontools}/bin/smartctl "$@"
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'';
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};
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system = { };
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mem = { };
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file = [{
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data_format = "influx";
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file_tag = "name";
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files = [ "/var/log/telegraf/*" ];
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}] ++ lib.optional (lib.any (fs: fs == "ext4") config.boot.supportedFilesystems) {
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name_override = "ext4_errors";
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files = [ "/sys/fs/ext4/*/errors_count" ];
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data_format = "value";
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};
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exec = lib.optionalAttrs (lib.any (fs: fs == "zfs") config.boot.supportedFilesystems) {
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## Commands array
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commands = [
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(pkgs.writeScript "zpool-health" ''
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#!${pkgs.gawk}/bin/awk -f
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BEGIN {
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while ("${pkgs.zfs}/bin/zpool status" | getline) {
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if ($1 ~ /pool:/) { printf "zpool_status,name=%s ", $2 }
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if ($1 ~ /state:/) { printf " state=\"%s\",", $2 }
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if ($1 ~ /errors:/) {
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if (index($2, "No")) printf "errors=0i\n"; else printf "errors=%di\n", $2
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}
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}
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}
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'')
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];
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data_format = "influx";
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};
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file =
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[
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{
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data_format = "influx";
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file_tag = "name";
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files = [ "/var/log/telegraf/*" ];
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}
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]
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++ lib.optional (lib.any (fs: fs == "ext4") config.boot.supportedFilesystems) {
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name_override = "ext4_errors";
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files = [ "/sys/fs/ext4/*/errors_count" ];
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data_format = "value";
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};
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exec = [
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{
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## Commands array
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commands =
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[ ipv6DadCheck ]
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++ zfsChecks
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++ nfsChecks;
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data_format = "influx";
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}
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];
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systemd_units = { };
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swap = { };
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disk.tagdrop = {
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@ -62,6 +129,11 @@ in {
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device = [ "rpc_pipefs" "lxcfs" "nsfs" "borgfs" ];
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};
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diskio = { };
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zfs = {
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poolMetrics = true;
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};
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} // lib.optionalAttrs (if lib.versionAtLeast (lib.versions.majorMinor lib.version) "23.11" then config.boot.swraid.enable else config.boot.initrd.services.swraid.enable) {
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mdstat = { };
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};
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outputs.prometheus_client = {
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listen = ":9273";
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@ -69,4 +141,23 @@ in {
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};
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};
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};
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security.sudo.extraRules = lib.mkIf (!isVM) [
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{
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users = [ "telegraf" ];
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commands = [
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{
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command = "${pkgs.smartmontools}/bin/smartctl";
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options = [ "NOPASSWD" ];
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}
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];
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}
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];
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# avoid logging sudo use
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security.sudo.configFile = ''
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Defaults:telegraf !syslog,!pam_session
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'';
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# create dummy file to avoid telegraf errors
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systemd.tmpfiles.rules = [
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"f /var/log/telegraf/dummy 0444 root root - -"
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];
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}
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