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Supported OS
Agent の Memcache チェックを使用して、Memcache のメモリ使用量、ヒット数、ミス数、エビクション数、フィルパーセンテージなどを追跡します。
Memcache チェックは Datadog Agent パッケージに含まれています。Memcache サーバーに追加でインストールする必要はありません。
ホストで実行されている Agent 用にこのチェックを構成する場合は、以下の手順に従ってください。コンテナ環境の場合は、コンテナ化セクションを参照してください。
Memcache サーバーを起動する際に、バインディングプロトコル -B
を binary
または auto
に設定します。自動 (auto) がデフォルトです。
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:
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 mcache.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 mcache.d/conf.yaml を参照してください。
init_config:
instances:
## @param url - string - required
## url used to connect to the Memcached instance.
#
- url: localhost
Agent を再起動すると、Datadog への Memcache メトリクスの送信が開始されます。
Datadog APM は、Memcache と統合して分散システム全体のトレースを確認します。Datadog Agent v6 以降では、トレースの収集はデフォルトで有効化されています。トレースの収集を開始するには、以下の手順に従います。
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 | 値 |
---|---|
<インテグレーション名> | mcache |
<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> | {"url": "%%host%%","port": "11211"} |
コンテナ化されたアプリケーションの APM は、Agent v6 以降を実行するホストでサポートされていますが、トレースの収集を開始するには、追加のコンフィギュレーションが必要です。
Agent コンテナで必要な環境変数
パラメーター | 値 |
---|---|
<DD_API_KEY> | api_key |
<DD_APM_ENABLED> | true |
<DD_APM_NON_LOCAL_TRAFFIC> | true |
利用可能な環境変数とコンフィギュレーションの完全なリストについては、Kubernetes アプリケーションのトレースおよび Kubernetes Daemon のセットアップを参照してください。
次に、アプリケーションコンテナをインスツルメントし、Agent コンテナの名前に DD_AGENT_HOST
を設定します。
Agent バージョン 6.0 以降で利用可能
このコンフィギュレーションブロックを mcache.d/conf.yaml
ファイルに追加すると、Memcached ログの収集を開始します。
logs:
- type: file
path: /var/log/memcached.log
source: memcached
service: mcache
path
パラメーターと service
パラメーターの値を変更し、環境に合わせて構成します。
Agent を再起動して、変更を検証します。
Agent の status
サブコマンドを実行し、Checks セクションで mcache
を探します。
memcache.avg_item_size (gauge) | The average size of an item. Shown as byte |
memcache.bytes (gauge) | Current number of bytes used by this server to store items. Shown as byte |
memcache.bytes_read_rate (gauge) | Rate of bytes read from the network by this server. Shown as byte |
memcache.bytes_written_rate (gauge) | Rate of bytes written to the network by this server. Shown as byte |
memcache.cas_badval_rate (gauge) | Rate at which keys are compared and swapped where the comparison (original) value did not match the supplied value. Shown as key |
memcache.cas_hits_rate (gauge) | Rate at which keys are compared and swapped and found present. Shown as hit |
memcache.cas_misses_rate (gauge) | Rate at which keys are compared and swapped and not found present. Shown as miss |
memcache.cmd_flush_rate (gauge) | Rate of "flush_all" commands. Shown as command |
memcache.cmd_get_rate (gauge) | Rate of "get" commands. Shown as command |
memcache.cmd_set_rate (gauge) | Rate of "set" commands. Shown as command |
memcache.connection_structures (gauge) | Number of connection structures allocated by the server. |
memcache.curr_connections (gauge) | Number of open connections to this server. Shown as connection |
memcache.max_connections (gauge) | Maximum number of connections to this server. Shown as connection |
memcache.curr_items (gauge) | Current number of items stored by the server. Shown as item |
memcache.delete_hits_rate (gauge) | Rate at which delete commands result in items being removed. Shown as hit |
memcache.delete_misses_rate (gauge) | Rate at which delete commands result in no items being removed. Shown as miss |
memcache.evictions_rate (gauge) | Rate at which valid items are removed from cache to free memory for new items. Shown as eviction |
memcache.fill_percent (gauge) | Amount of memory being used by the server for storing items as a percentage of the max allowed. Shown as percent |
memcache.get_hit_percent (gauge) | Percentage of requested keys that are found present since the start of the memcache server. Shown as percent |
memcache.get_hits_rate (gauge) | Rate at which keys are requested and found present. Shown as hit |
memcache.get_misses_rate (gauge) | Rate at which keys are requested and not found. Shown as miss |
memcache.limit_maxbytes (gauge) | Number of bytes this server is allowed to use for storage. Shown as byte |
memcache.listen_disabled_num_rate (gauge) | Rate at which the server has reached the max connection limit. Shown as event |
memcache.pointer_size (gauge) | Default size of pointers on the host OS (generally 32 or 64) Shown as bit |
memcache.rusage_system_rate (gauge) | Fraction of time the CPU spent executing kernel code on behalf of this server process. Shown as fraction |
memcache.rusage_user_rate (gauge) | Fraction of user time the CPU spent executing this server process. Shown as fraction |
memcache.threads (gauge) | Number of threads used by the current Memcached server process. Shown as thread |
memcache.total_connections_rate (gauge) | Rate at which connections to this server are opened. Shown as connection |
memcache.total_items (gauge) | Total number of items stored by this server since it started. Shown as item |
memcache.uptime (gauge) | Number of seconds this server has been running. Shown as second |
memcache.items.evicted_rate (gauge) | Rate at which items had to be evicted from the LRU before expiring Shown as eviction |
memcache.items.evicted_nonzero_rate (gauge) | Rate at which nonzero items which had an explicit expire time set had to be evicted from the LRU before expiring Shown as eviction |
memcache.items.expired_unfetched_rate (gauge) | Rate at which expired items reclaimed from the LRU which were never touched after being set Shown as eviction |
memcache.items.evicted_unfetched_rate (gauge) | Rate at which valid items evicted from the LRU which were never touched after being set Shown as eviction |
memcache.items.outofmemory_rate (gauge) | Rate at which the underlying slab class was unable to store a new item Shown as error |
memcache.items.tailrepairs_rate (gauge) | Rate at which memcache self-healed a slab with a refcount leak Shown as operation |
memcache.items.moves_to_cold_rate (gauge) | Rate at which items were moved from HOT or WARM into COLD Shown as item |
memcache.items.moves_to_warm_rate (gauge) | Rate at which items were moved from COLD to WARM Shown as item |
memcache.items.moves_within_lru_rate (gauge) | Rate at which active items were bumped within HOT or WARM Shown as item |
memcache.items.reclaimed_rate (gauge) | Rate at which entries were stored using memory from an expired entry Shown as operation |
memcache.items.crawler_reclaimed_rate (gauge) | Rate at which items freed by the LRU Crawler Shown as operation |
memcache.items.lrutail_reflocked_rate (gauge) | Rate at which items found to be refcount locked in the LRU tail Shown as item |
memcache.items.direct_reclaims_rate (gauge) | Rate at which worker threads had to directly pull LRU tails to find memory for a new item Shown as operation |
memcache.items.number (gauge) | Number of items presently stored in this slab class Shown as item |
memcache.items.number_hot (gauge) | Number of items presently stored in the HOT LRU Shown as item |
memcache.items.number_warm (gauge) | Number of items presently stored in the WARM LRU Shown as item |
memcache.items.number_cold (gauge) | Number of items presently stored in the COLD LRU Shown as item |
memcache.items.number_noexp (gauge) | Number of items presently stored in the NOEXP class Shown as item |
memcache.items.age (gauge) | Age of the oldest item in the LRU Shown as second |
memcache.items.evicted_time (gauge) | Seconds since the last access for the most recent item evicted from this class Shown as second |
memcache.slabs.get_hits_rate (gauge) | Rate at which get requests were serviced by this slab class Shown as hit |
memcache.slabs.cmd_set_rate (gauge) | Rate at which set requests stored data in this slab class Shown as command |
memcache.slabs.delete_hits_rate (gauge) | Rate at which delete commands succeeded in this slab class Shown as operation |
memcache.slabs.incr_hits_rate (gauge) | Rate at which incrs commands modified this slab class Shown as operation |
memcache.slabs.decr_hits_rate (gauge) | Rate at which decrs commands modified this slab class Shown as operation |
memcache.slabs.cas_hits_rate (gauge) | Rate at which CAS commands modified this slab class Shown as operation |
memcache.slabs.cas_badval_rate (gauge) | Rate at which CAS commands failed to modify a value due to a bad CAS id Shown as key |
memcache.slabs.touch_hits_rate (gauge) | Rate of touches serviced by this slab class Shown as operation |
memcache.slabs.used_chunks_rate (gauge) | Rate at which chunks have been allocated to items Shown as buffer |
memcache.slabs.chunk_size (gauge) | The amount of space each chunk uses Shown as byte |
memcache.slabs.chunks_per_page (gauge) | How many chunks exist within one page Shown as buffer |
memcache.slabs.total_pages (gauge) | Total number of pages allocated to the slab class Shown as page |
memcache.slabs.total_chunks (gauge) | Total number of chunks allocated to the slab class Shown as buffer |
memcache.slabs.used_chunks (gauge) | How many chunks have been allocated to items Shown as buffer |
memcache.slabs.free_chunks (gauge) | Chunks not yet allocated to items or freed via delete Shown as buffer |
memcache.slabs.free_chunks_end (gauge) | Number of free chunks at the end of the last allocated page Shown as buffer |
memcache.slabs.mem_requested (gauge) | Number of bytes requested to be stored in this slab Shown as byte |
memcache.slabs.active_slabs (gauge) | Total number of slab classes allocated Shown as occurrence |
memcache.slabs.total_malloced (gauge) | Total amount of memory allocated to slab pages Shown as byte |
mcache.d/conf.yaml
で options.slabs: true
と設定している場合、チェックは memcache.slabs.*
メトリクスのみを収集します。同様に、options.items: true
と設定している場合、チェックは memcache.items.*
メトリクスのみを収集します。
Mcache チェックには、イベントは含まれません。
memcache.can_connect
Returns CRITICAL
if the Agent is unable to connect to the monitored Memcached instance. Returns OK
otherwise.
Statuses: ok, critical
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。