Power DNS Recursor

Supported OS Linux Windows

Integrationv2.2.0

概要

PowerDNS Recursor のパフォーマンスを追跡し、異常または注意が必要なトラフィックを監視します。この Agent チェックでは、Recursor から以下のような多様なメトリクスを収集することができます。

  • クエリ回答時間: 1 ミリ秒、10 ミリ秒、100 ミリ秒、1 秒未満、および 1 秒以上の時間がかかった応答の数を確認します。
  • クエリのタイムアウト
  • キャッシュヒット数およびミス数
  • タイプごとの回答率: SRVFAIL、NXDOMAIN、NOERROR
  • 無視および削除されたパケット数

その他にも多数あります。

セットアップ

インストール

PowerDNS Recursor チェックは Datadog Agent パッケージに含まれています。Recursor に追加でインストールする必要はありません。

コンフィギュレーション

PowerDNS の準備

このチェックは、PowerDNS Recursor の統計 API を使ってパフォーマンス統計を収集します。4.1 より前のバージョンの pdns_recursor は、デフォルトで統計 API が有効ではありません。古いバージョンを実行している場合は、Recursor 構成ファイル (たとえば /etc/powerdns/recursor.conf) に次の行を追加して有効にしてください。

webserver=yes
api-key=changeme             # v4.0 以降でのみ使用可能
webserver-readonly=yes       # デフォルトは no
#webserver-port=8081         # デフォルトは 8082
#webserver-address=0.0.0.0   # デフォルトは 127.0.0.1

pdns_recursor 3.x を実行している場合は、これらのオプション名の前に experimental- を付けてください。たとえば、experimental-webserver=yes とします。

pdns_recursor 4.1 以上を実行している場合は、api-key のみを設定します。

Recursor を再起動すると、統計 API が有効になります。

ホスト

ホストで実行中の Agent に対してこのチェックを構成するには:

  1. Agent のコンフィギュレーションディレクトリのルートにある conf.d/ フォルダーの powerdns_recursor.d/conf.yaml ファイルを編集します。使用可能なすべてのコンフィギュレーションオプションについては、サンプル powerdns_recursor.d/conf.yaml を参照してください。

    init_config:
    
    instances:
      ## @param host - string - required
      ## Host running the recursor.
      #
      - host: 127.0.0.1
    
        ## @param port - integer - required
        ## Recursor web server port.
        #
        port: 8082
    
        ## @param api_key - string - required
        ## Recursor web server api key.
        #
        api_key: "<POWERDNS_API_KEY>"
    
        ## @param version - integer - required - default: 3
        ## Version 3 or 4 of PowerDNS Recursor to connect to.
        ## The PowerDNS Recursor in v4 has a production ready web server that allows for
        ## statistics gathering. In version 3.x the server was marked as experimental.
        ##
        ## As the server was marked as experimental in version 3 many of the metrics have
        ## changed names and the API structure (paths) have also changed. With these changes
        ## there has been a need to separate the two concerns. The check now has a key value
        ## version: which if set to version 4 queries with the correct API path on the
        ## non-experimental web server.
        ##
        ## https://doc.powerdns.com/md/httpapi/api_spec/#url-apiv1serversserver95idstatistics
        #
        version: 3
    
  2. Agent を再起動します

ログの収集
  1. Datadog Agent で、ログの収集はデフォルトで無効になっています。以下のように、datadog.yaml でこれを有効にする必要があります。

    logs_enabled: true
    
  2. 以下を実行して、systemd-journal グループに dd-agent ユーザーを追加します。

    usermod -a -G systemd-journal dd-agent
    
  3. PowerDNS Recursor のログの収集を開始するには、次のコンフィギュレーションブロックを powerdns_recursor.d/conf.yaml ファイルに追加します。

    logs:
      - type: journald
        source: powerdns
    

    使用可能なすべての構成オプションの詳細については、サンプル powerdns_recursor.d/conf.yaml を参照してください。

  4. Agent を再起動します

コンテナ化

コンテナ環境の場合は、オートディスカバリーのインテグレーションテンプレートのガイドを参照して、次のパラメーターを適用してください。

パラメーター
<インテグレーション名>powerdns_recursor
<初期コンフィギュレーション>空白または {}
<インスタンスコンフィギュレーション>{"host":"%%host%%", "port":8082, "api_key":"<POWERDNS_API_KEY>", "version": 3}
ログの収集

Datadog Agent で、ログの収集はデフォルトで無効になっています。有効にする方法については、Kubernetes ログ収集を参照してください。

パラメーター
<LOG_CONFIG>{"source": "powerdns"}

検証

Agent の status サブコマンドを実行し、Checks セクションで powerdns_recursor を探します。

収集データ

メトリクス

powerdns.recursor.cache_entries
(gauge)
The number of entries in the cache
Shown as entry
powerdns.recursor.negcache_entries
(gauge)
The number of entries in the negative answer cache
Shown as entry
powerdns.recursor.packetcache_entries
(gauge)
The number of entries in the packet cache
Shown as entry
powerdns.recursor.failed_host_entries
(gauge)
The number of servers that failed to resolve
Shown as host
powerdns.recursor.concurrent_queries
(gauge)
The number of MThreads currently running
Shown as query
powerdns.recursor.throttle_entries
(gauge)
The number of entries in the throttle map
Shown as entry
powerdns.recursor.all_outqueries
(gauge)
The number of outgoing udp queries per second
Shown as query
powerdns.recursor.answers_slow
(gauge)
Number of queries per second NOT answered within 1 second
Shown as query
powerdns.recursor.answers0_1
(gauge)
Number of queries per second answered within 1 millisecond
Shown as query
powerdns.recursor.answers1_10
(gauge)
Number of queries per second answered within 10 milliseconds
Shown as query
powerdns.recursor.answers10_100
(gauge)
Number of queries per second answered within 100 milliseconds
Shown as query
powerdns.recursor.answers100_1000
(gauge)
Number of queries per second answered within 1 second
Shown as query
powerdns.recursor.cache_hits
(gauge)
The number of cache hits per second
Shown as hit
powerdns.recursor.cache_misses
(gauge)
The number of cache misses per second
Shown as miss
powerdns.recursor.chain_resends
(gauge)
The number of queries per second chained to existing outstanding query
Shown as query
powerdns.recursor.case_mismatches
(gauge)
The number of mismatches in character case per second
Shown as error
powerdns.recursor.client_parse_errors
(gauge)
The number of unparsable packets per second
Shown as error
powerdns.recursor.dont_outqueries
(gauge)
The number of outgoing queries dropped per second because of 'dont query' setting
Shown as query
powerdns.recursor.ipv6_outqueries
(gauge)
The number of outgoing queries per second over IPv6
powerdns.recursor.ipv6_questions
(gauge)
The number of end-user-initiated IPv6 UDP queries with the RD bit set
Shown as query
powerdns.recursor.nxdomain_answers
(gauge)
The number of NXDOMAIN answers per second
Shown as response
powerdns.recursor.max_mthread_stack
(gauge)
The maximum amount of thread stack ever used
powerdns.recursor.outgoing_timeouts
(gauge)
The number of outgoing UDP query timeouts per second
Shown as timeout
powerdns.recursor.over_capacity_drops
(gauge)
The number of questions per second dropped due to having reached concurrent query limit
Shown as query
powerdns.recursor.packetcache_hits
(gauge)
The number of packet cache hits per second
Shown as hit
powerdns.recursor.packetcache_misses
(gauge)
The number of packet cache misses per second
Shown as miss
powerdns.recursor.policy_drops
(gauge)
The number of packets dropped per second because of Lua policy decision
Shown as packet
powerdns.recursor.qa_latency
(gauge)
The average latency in microseconds exponentially weighted over past 'latency-statistic-size' packets
Shown as microsecond
powerdns.recursor.server_parse_errors
(gauge)
The number of server replied packets per second that could not be parsed
Shown as error
powerdns.recursor.servfail_answers
(gauge)
The number of SERVFAIL answers per second
Shown as response
powerdns.recursor.spoof_prevents
(gauge)
The number of times per second PowerDNS considers itself spoofed and drops data
powerdns.recursor.sys_msec
(gauge)
The number of CPU milliseconds spent in 'system' mode
Shown as millisecond
powerdns.recursor.tcp_client_overflow
(gauge)
The number of outgoing queries dropped per second because of 'dont query' setting
Shown as query
powerdns.recursor.tcp_clients
(gauge)
The number of active TCP/IP clients per second
powerdns.recursor.tcp_outqueries
(gauge)
The number of outgoing TCP queries per second
Shown as operation
powerdns.recursor.throttled_out
(gauge)
The number of throttled outgoing UDP queries per second
Shown as operation
powerdns.recursor.unauthorized_tcp
(gauge)
The number of TCP questions denied per second because of allow-from restrictions
Shown as operation
powerdns.recursor.unauthorized_udp
(gauge)
The number of UDP questions denied per second because of allow-from restrictions
Shown as operation
powerdns.recursor.unexpected_packets
(gauge)
The number of unexpected answers per second from remote servers
Shown as operation
powerdns.recursor.unreachables
(gauge)
The number times per second nameservers were unreachable
powerdns.recursor.uptime
(gauge)
The number of seconds PowerDNS has been running
Shown as second
powerdns.recursor.user_msec
(gauge)
The number of CPU milliseconds spent in 'user' mode
Shown as millisecond
powerdns.recursor.noerror_answers
(gauge)
The number of NOERROR answers per second
Shown as operation
powerdns.recursor.questions
(gauge)
The number of user initiated udp queries per second
Shown as operation
powerdns.recursor.tcp_questions
(gauge)
The number of incoming tcp queries per second
Shown as operation
powerdns.recursor.auth4_answers_slow
(gauge)
Number of queries per second NOT answered by auth4s within 1 second; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth4_answers0_1
(gauge)
Number of queries per second answered by auth4s within 1 millisecond; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth4_answers1_10
(gauge)
Number of queries per second answered by auth4s within 10 milliseconds; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth4_answers10_100
(gauge)
Number of queries per second answered by auth4s within 100 milliseconds; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth4_answers100_1000
(gauge)
Number of queries per second answered by auth4s within 1 second; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth6_answers_slow
(gauge)
Number of queries per second NOT answered by auth6s within 1 second; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth6_answers0_1
(gauge)
Number of queries per second answered by auth6s within 1 millisecond; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth6_answers1_10
(gauge)
Number of queries per second answered by auth6s within 10 milliseconds; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth6_answers10_100
(gauge)
Number of queries per second answered by auth6s within 100 milliseconds; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.auth6_answers100_1000
(gauge)
Number of queries per second answered by auth6s within 1 second; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.dlg_only_drops
(gauge)
The number of records dropped per second because of 'delegation only' setting; Available since pdns_recursor v4.x
Shown as record
powerdns.recursor.dnssec_queries
(gauge)
The number of queries received per second with the DO bit set; Available since pdns_recursor v4.x
Shown as record
powerdns.recursor.dnssec_result_bogus
(gauge)
The number of DNSSEC validations per second that had the Bogus state; Available since pdns_recursor v4.x
powerdns.recursor.dnssec_result_indeterminate
(gauge)
The number of DNSSEC validations per second that had the Indeterminate state; Available since pdns_recursor v4.x
powerdns.recursor.dnssec_result_insecure
(gauge)
The number of DNSSEC validations per second that had the Insecure state; Available since pdns_recursor v4.x
powerdns.recursor.dnssec_result_nta
(gauge)
The number of DNSSEC validations per second that had the NTA (negative trust anchor) state; Available since pdns_recursor v4.x
powerdns.recursor.dnssec_result_secure
(gauge)
The number of DNSSEC validations per second that had the Secure state; Available since pdns_recursor v4.x
powerdns.recursor.dnssec_validations
(gauge)
The number of DNSSEC validations performed per second; Available since pdns_recursor v4.x
powerdns.recursor.edns_ping_matches
(gauge)
The number of servers per second that sent a valid EDNS PING response; Available since pdns_recursor v4.x
Shown as host
powerdns.recursor.edns_ping_mismatches
(gauge)
The number of servers per second that sent an invalid EDNS PING response; Available since pdns_recursor v4.x
Shown as host
powerdns.recursor.ignored_packets
(gauge)
The number of non-query packets received per second on server sockets that should only get queries; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.no_error_packets
(gauge)
The number of erroneous packets received per second; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.noedns_outqueries
(gauge)
The number of queries per second sent without EDNS; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.noping_outqueries
(gauge)
The number of queries per second sent without EDNS PING; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.nsset_invalidations
(gauge)
The number of times per second an nsset was dropped because it no longer worked; Available since pdns_recursor v4.x
powerdns.recursor.nsspeeds_entries
(gauge)
The number of entries in the NS speeds map; Available since pdns_recursor v4.x
Shown as entry
powerdns.recursor.outgoing4_timeouts
(gauge)
The number of timeouts per second for outgoing UDP IPv4 queries; Available since pdns_recursor v4.x
Shown as timeout
powerdns.recursor.outgoing6_timeouts
(gauge)
The number of timeouts per second for outgoing UDP IPv6 queries; Available since pdns_recursor v4.x
Shown as timeout
powerdns.recursor.policy_result_custom
(gauge)
The number of packets per second that were sent a custom answer by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.policy_result_noaction
(gauge)
The number of packets per second that were not actioned upon by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.policy_result_drop
(gauge)
The number of packets per second dropped by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.policy_result_nxdomain
(gauge)
The number of packets per second that were replied to with NXDOMAIN by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.policy_result_nodata
(gauge)
The number of packets per second that were replied to with NODATA by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.policy_result_truncate
(gauge)
The number of packets per second that were forced to TCP by the RPZ/filter engine; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.real_memory_usage
(gauge)
The amount of memory consumed by PowerDNS in bytes; Available since pdns_recursor v4.x
Shown as byte
powerdns.recursor.resource_limits
(gauge)
The number of queries per second that could not be performed due to resource limits; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.too_old_drops
(gauge)
The number of questions per second that were dropped because they were too old; Available since pdns_recursor v4.x
Shown as query
powerdns.recursor.udp_in_errors
(gauge)
The number of packets per second that were received faster than the OS could process them; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.udp_noport_errors
(gauge)
The number of UDP packets per second where an ICMP response was received saying the remote port was not listening; Available since pdns_recursor v4.x
Shown as packet
powerdns.recursor.udp_recvbuf_errors
(gauge)
The number of errors per second caused in the UDP receive buffer; Available since pdns_recursor v4.x
Shown as error
powerdns.recursor.udp_sndbuf_errors
(gauge)
The number of errors per second caused in the UDP send buffer; Available since pdns_recursor v4.x
Shown as error

イベント

PowerDNS Recursor チェックには、イベントは含まれません。

サービスのチェック

powerdns_recursor.can_connect
Agent チェックが監視対象の Gearman インスタンスに接続できない場合は、CRITICAL を返します。それ以外の場合は、OK を返します。
Statuses: ok, クリティカル

トラブルシューティング

ご不明な点は、Datadog のサポートチームまでお問合せください。