diff options
| -rw-r--r-- | lass/2configs/monitoring/telegraf.nix | 175 |
1 files changed, 133 insertions, 42 deletions
diff --git a/lass/2configs/monitoring/telegraf.nix b/lass/2configs/monitoring/telegraf.nix index 5258b87ed..b172b9c62 100644 --- a/lass/2configs/monitoring/telegraf.nix +++ b/lass/2configs/monitoring/telegraf.nix @@ -1,60 +1,127 @@ -{ config, lib, pkgs, ... }: +{ pkgs, lib, config, ... }: +# To use this module you also need to allow port 9273 either on the internet or on a vpn interface +# i.e. networking.firewall.interfaces."vpn0".allowedTCPPorts = [ 9273 ]; +# Example prometheus alert rules: +# - https://github.com/Mic92/dotfiles/blob/master/nixos/eva/modules/prometheus/alert-rules.nix let isVM = lib.any (mod: mod == "xen-blkfront" || mod == "virtio_console") config.boot.initrd.kernelModules; -in { + # potentially wrong if the nvme is not used at boot... + hasNvme = lib.any (m: m == "nvme") config.boot.initrd.availableKernelModules; - krebs.iptables.tables.filter.INPUT.rules = [ - { predicate = "-i retiolum -p tcp --dport 9273"; target = "ACCEPT"; } - ]; + ipv6DadCheck = pkgs.writeShellScript "ipv6-dad-check" '' + ${pkgs.iproute2}/bin/ip --json addr | \ + ${pkgs.jq}/bin/jq -r 'map(.addr_info) | flatten(1) | map(select(.dadfailed == true)) | map(.local) | @text "ipv6_dad_failures count=\(length)i"' + ''; - systemd.services.telegraf.path = [ pkgs.nvme-cli ]; + zfsChecks = lib.optional + (lib.any (fs: fs == "zfs") config.boot.supportedFilesystems) + (pkgs.writeScript "zpool-health" '' + #!${pkgs.gawk}/bin/awk -f + BEGIN { + while ("${pkgs.zfs}/bin/zpool status" | getline) { + if ($1 ~ /pool:/) { printf "zpool_status,name=%s ", $2 } + if ($1 ~ /state:/) { printf " state=\"%s\",", $2 } + if ($1 ~ /errors:/) { + if (index($2, "No")) printf "errors=0i\n"; else printf "errors=%di\n", $2 + } + } + } + ''); + + nfsChecks = + let + collectHosts = shares: fs: + if builtins.elem fs.fsType [ "nfs" "nfs3" "nfs4" ] + then + shares + // ( + let + # also match ipv6 addresses + group = builtins.match "\\[?([^\]]+)]?:([^:]+)$" fs.device; + host = builtins.head group; + path = builtins.elemAt group 1; + in + { + ${host} = (shares.${host} or [ ]) ++ [ path ]; + } + ) + else shares; + nfsHosts = lib.foldl collectHosts { } (builtins.attrValues config.fileSystems); + in + lib.mapAttrsToList + ( + host: args: + (pkgs.writeScript "nfs-health" '' + #!${pkgs.gawk}/bin/awk -f + BEGIN { + for (i = 2; i < ARGC; i++) { + mounts[ARGV[i]] = 1 + } + while ("${pkgs.nfs-utils}/bin/showmount -e " ARGV[1] | getline) { + if (NR == 1) { continue } + if (mounts[$1] == 1) { + printf "nfs_export,host=%s,path=%s present=1\n", ARGV[1], $1 + } + delete mounts[$1] + } + for (mount in mounts) { + printf "nfs_export,host=%s,path=%s present=0\n", ARGV[1], $1 + } + } + '') + + " ${host} ${builtins.concatStringsSep " " args}" + ) + nfsHosts; + +in +{ + + systemd.services.telegraf.path = lib.optional (!isVM && hasNvme) pkgs.nvme-cli; services.telegraf = { enable = true; extraConfig = { agent.interval = "60s"; inputs = { - http_response = [ - { urls = [ - "http://localhost:8080/about/health/" - ]; } + prometheus.urls = lib.mkIf config.services.promtail.enable [ + # default promtail port + "http://localhost:9080/metrics" ]; prometheus.metric_version = 2; kernel_vmstat = { }; - # smart = lib.mkIf (!isVM) { - # path = pkgs.writeShellScript "smartctl" '' - # exec /run/wrappers/bin/sudo ${pkgs.smartmontools}/bin/smartctl "$@" - # ''; - # }; + nginx.urls = lib.mkIf config.services.nginx.statusPage [ + "http://localhost/nginx_status" + ]; + smart = lib.mkIf (!isVM) { + path_smartctl = pkgs.writeShellScript "smartctl" '' + exec /run/wrappers/bin/sudo ${pkgs.smartmontools}/bin/smartctl "$@" + ''; + }; system = { }; mem = { }; - file = [{ - data_format = "influx"; - file_tag = "name"; - files = [ "/var/log/telegraf/*" ]; - }] ++ lib.optional (lib.any (fs: fs == "ext4") config.boot.supportedFilesystems) { - name_override = "ext4_errors"; - files = [ "/sys/fs/ext4/*/errors_count" ]; - data_format = "value"; - }; - exec = lib.optionalAttrs (lib.any (fs: fs == "zfs") config.boot.supportedFilesystems) { - ## Commands array - commands = [ - (pkgs.writeScript "zpool-health" '' - #!${pkgs.gawk}/bin/awk -f - BEGIN { - while ("${pkgs.zfs}/bin/zpool status" | getline) { - if ($1 ~ /pool:/) { printf "zpool_status,name=%s ", $2 } - if ($1 ~ /state:/) { printf " state=\"%s\",", $2 } - if ($1 ~ /errors:/) { - if (index($2, "No")) printf "errors=0i\n"; else printf "errors=%di\n", $2 - } - } - } - '') - ]; - data_format = "influx"; - }; + file = + [ + { + data_format = "influx"; + file_tag = "name"; + files = [ "/var/log/telegraf/*" ]; + } + ] + ++ lib.optional (lib.any (fs: fs == "ext4") config.boot.supportedFilesystems) { + name_override = "ext4_errors"; + files = [ "/sys/fs/ext4/*/errors_count" ]; + data_format = "value"; + }; + exec = [ + { + ## Commands array + commands = + [ ipv6DadCheck ] + ++ zfsChecks + ++ nfsChecks; + data_format = "influx"; + } + ]; systemd_units = { }; swap = { }; disk.tagdrop = { @@ -62,6 +129,11 @@ in { device = [ "rpc_pipefs" "lxcfs" "nsfs" "borgfs" ]; }; diskio = { }; + zfs = { + poolMetrics = true; + }; + } // lib.optionalAttrs (if lib.versionAtLeast (lib.versions.majorMinor lib.version) "23.11" then config.boot.swraid.enable else config.boot.initrd.services.swraid.enable) { + mdstat = { }; }; outputs.prometheus_client = { listen = ":9273"; @@ -69,4 +141,23 @@ in { }; }; }; + security.sudo.extraRules = lib.mkIf (!isVM) [ + { + users = [ "telegraf" ]; + commands = [ + { + command = "${pkgs.smartmontools}/bin/smartctl"; + options = [ "NOPASSWD" ]; + } + ]; + } + ]; + # avoid logging sudo use + security.sudo.configFile = '' + Defaults:telegraf !syslog,!pam_session + ''; + # create dummy file to avoid telegraf errors + systemd.tmpfiles.rules = [ + "f /var/log/telegraf/dummy 0444 root root - -" + ]; } |