path: root/modules/private/monitoring/default.nix

{ config, pkgs, lib, name, ... }:
let
  myplugins = pkgs.runCommand "buildplugins" {
    buildInputs = [ pkgs.makeWrapper pkgs.perl ];
  } ''
    mkdir $out
    cp ${./plugins}/* $out/
    patchShebangs $out
    wrapProgram $out/check_command --prefix PATH : ${config.security.wrapperDir}
    wrapProgram $out/send_nrdp.sh --prefix PATH : ${lib.makeBinPath [
      pkgs.curl pkgs.jq
    ]}
    wrapProgram $out/check_mem.sh --prefix PATH : ${lib.makeBinPath [
      pkgs.gnugrep pkgs.gawk pkgs.procps-ng
    ]}
    wrapProgram $out/check_postgres_replication --prefix PATH : ${lib.makeBinPath [
      pkgs.postgresql
    ]}
    wrapProgram $out/check_redis_replication --prefix PATH : ${lib.makeBinPath [
      pkgs.gnugrep pkgs.coreutils pkgs.redis
    ]}
    wrapProgram $out/check_mysql_replication --prefix PATH : ${lib.makeBinPath [
      pkgs.gnugrep pkgs.gnused pkgs.coreutils pkgs.mariadb
    ]}
    wrapProgram $out/check_openldap_replication --prefix PATH : ${lib.makeBinPath [
      pkgs.gnugrep pkgs.gnused pkgs.coreutils pkgs.openldap
    ]}
    '';
  toObjects = pkgs.callPackage ./to_objects.nix {};
  commonConfig = {
    eldiron = {
      processWarn = "250"; processAlert = "400";
      loadWarn = "8.0"; loadAlert = "10.0";
    };
    backup-2 = {
      processWarn = "50"; processAlert = "60";
      loadWarn = "1.0"; loadAlert = "2.0";
    };
  };
  commonObjects = pkgs.callPackage ./objects_common.nix ({
    hostFQDN = config.hostEnv.FQDN;
    sudo = "/run/wrappers/bin/sudo";
  } // builtins.getAttr name commonConfig);
  hostObjects =
    let
      specific_file = ./. + "/objects_" + name + ".nix";
    in
      lib.attrsets.optionalAttrs (builtins.pathExists specific_file) (pkgs.callPackage specific_file { inherit config; });
in
{
  options = {
    myServices.monitoring = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = ''
          Whether to enable monitoring.
        '';
      };
    };
  };

  config = lib.mkIf config.myServices.monitoring.enable {
    services.duplyBackup.profiles.monitoring = {
      rootDir = config.services.naemon.varDir;
    };
    security.sudo.extraRules = [
      {
        commands = [
          { command = "${pkgs.mdadm}/bin/mdadm --monitor --scan -1"; options = [ "NOPASSWD" ]; }
          { command = "${pkgs.postfix}/bin/mailq"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "root";
      }
      {
        commands = [
          { command = "${myplugins}/check_last_file_date /backup2/*"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "ALL";
      }
      {
        commands = [
          { command = "${myplugins}/check_postgres_replication *"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "postgres";
      }
      {
        commands = [
          { command = "${myplugins}/check_mysql_replication *"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "mysql";
      }
      {
        commands = [
          { command = "${myplugins}/check_openldap_replication *"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "openldap";
      }
      {
        commands = [
          { command = "${myplugins}/check_redis_replication *"; options = [ "NOPASSWD" ]; }
        ];
        users = [ "naemon" ];
        runAs = "redis";
      }
    ];
    environment.etc."mdadm.conf" = {
      enable = true;
      mode = "0644";
      user = "root";
      text = "MAILADDR ${config.myEnv.monitoring.email}";
    };

    # needed since extraResource is not in the closure
    systemd.services.naemon.path = [ myplugins ];
    services.naemon = {
      enable = true;
      extraConfig = ''
        broker_module=${pkgs.naemon-livestatus}/lib/naemon-livestatus/livestatus.so ${config.services.naemon.runDir}/live
        use_syslog=1
        log_initial_states=1
        date_format=iso8601
        admin_email=${config.myEnv.monitoring.email}

        obsess_over_services=1
        ocsp_command=notify-master
      '';
      extraResource = ''
        $USER2$=${myplugins}
        $USER200$=${config.myEnv.monitoring.status_url}
        $USER201$=${config.myEnv.monitoring.status_token}
      '';
      objectDefs = toObjects commonObjects + toObjects hostObjects;
    };
  };
}