CoreDNS

Supported OS Linux

Integrationv2.2.0

Présentation

Recueillez des métriques de CoreDNS en temps réel pour visualiser et surveiller les échecs de DNS et les hits et miss de cache.

Configuration

Installation

Le check CoreDNS est inclus avec le paquet de l’Agent Datadog : vous n’avez donc rien d’autre à installer sur vos serveurs.

Note : la version actuelle du check (1.11.0+) utilise OpenMetrics (OpenMetricsBaseCheckV2) pour la collecte de métriques, ce qui nécessite Python 3. Si votre host ne peut pas utiliser Python 3, ou si vous souhaitez utiliser l’ancienne version de ce check (OpenMetricsBaseCheckV1), consultez la configuration suivante. Les utilisateurs d’Autodiscovery se servant du fichier coredns.d/auto_conf.yaml n’ont toutefois pas besoin d’utiliser cette configuration, car ce fichier active par défaut l’option prometheus_url pour la version OpenMetricsBaseCheckV1 du check. Consultez le fichier d’exemple coredns.d/auto_conf.yaml pour découvrir les options de configuration par défaut et le fichier d’exemple coredns.d/conf.yaml.example pour découvrir toutes les options de configuration disponibles.

Remarque : la version OpenMetricsBaseCheckV2 du check CoreDNS envoie désormais les métriques .bucket et les échantillons d’histogramme .sum et .count sous la forme de counts monotones. Ces métriques étaient auparavant transmises sous la forme de gauges avec le check OpenMetricsBaseCheckV1. Consultez le fichier metadata.csv pour consulter la liste des métriques disponibles pour chaque version.

Procédure à suivre

Docker

Pour configurer ce check lorsque l’Agent est exécuté sur un conteneur :

Collecte de métriques

Définissez des modèles d’intégration Autodiscovery en tant qu’étiquettes Docker sur votre conteneur d’application :

LABEL "com.datadoghq.ad.check_names"='["coredns"]'
LABEL "com.datadoghq.ad.init_configs"='[{}]'
LABEL "com.datadoghq.ad.instances"='[{"openmetrics_endpoint":"http://%%host%%:9153/metrics", "tags":["dns-pod:%%host%%"]}]'

Pour activer l’ancienne version du check (OpenMetricsBaseCheckV1), remplacez openmetrics_endpoint par prometheus_url :

LABEL "com.datadoghq.ad.instances"='[{"prometheus_url":"http://%%host%%:9153/metrics", "tags":["dns-pod:%%host%%"]}]' 

Remarques :

  • Le fichier coredns.d/auto_conf.yaml transmis active par défaut l’option de l’ancien check OpenMetricsBaseCheckV1, à savoir prometheus_url.
  • Le tag dns-pod surveille l’IP du pod DNS cible. Les autres tags sont associés au dd-agent qui interroge les informations à l’aide de la découverte de services.
  • Les annotations de découverte de services doivent être effectuées sur le pod. En cas de déploiement, ajoutez les annotations aux métadonnées des spécifications du modèle. Ne les ajoutez pas au niveau des spécifications extérieures.

Collecte de logs

La collecte des logs est désactivée par défaut dans l’Agent Datadog. Pour l’activer, consultez la section Collecte de logs avec Docker.

Définissez ensuite des [intégrations de logs][5] en tant qu’étiquettes Docker :

LABEL "com.datadoghq.ad.logs"='[{"source":"coredns","service":"<NOM_SERVICE>"}]'

Kubernetes

Pour configurer ce check lorsque l’Agent est exécuté sur Kubernetes :

Collecte de métriques

Définissez des modèles d’intégration Autodiscovery en tant qu’annotations de pod sur votre conteneur d’application. Vous pouvez également configurer des modèles avec un fichier, une configmap ou un stockage key/value.

apiVersion: v1
kind: Pod
metadata:
  name: coredns
  annotations:
    ad.datadoghq.com/coredns.check_names: '["coredns"]'
    ad.datadoghq.com/coredns.init_configs: '[{}]'
    ad.datadoghq.com/coredns.instances: |
      [
        {
          "openmetrics_endpoint": "http://%%host%%:9153/metrics", 
          "tags": ["dns-pod:%%host%%"]
        }
      ]      
  labels:
    name: coredns
spec:
  containers:
    - name: coredns

Pour activer l’ancienne version du check (OpenMetricsBaseCheckV1), remplacez openmetrics_endpoint par prometheus_url :

    ad.datadoghq.com/coredns.instances: |
      [
        {
          "prometheus_url": "http://%%host%%:9153/metrics", 
          "tags": ["dns-pod:%%host%%"]
        }
      ]      

Remarques :

  • Le fichier coredns.d/auto_conf.yaml transmis active par défaut l’option de l’ancien check OpenMetricsBaseCheckV1, à savoir prometheus_url.
  • Le tag dns-pod correspond à l’IP du pod DNS cible. Les autres tags sont associés à l’Agent Datadog qui interroge les informations à l’aide de la découverte de services.
  • Les annotations de découverte de services doivent être effectuées sur le pod. En cas de déploiement, ajoutez les annotations aux métadonnées des spécifications du modèle. Ne les ajoutez pas au niveau des spécifications extérieures.

Collecte de logs

La collecte des logs est désactivée par défaut dans l’Agent Datadog. Pour l’activer, consultez la section Collecte de logs avec Kubernetes.

Définissez ensuite des intégrations de logs en tant qu’annotations de pod. Cette configuration peut également être réalisée avec un fichier, une configmap ou un stockage key/value.

apiVersion: v1
kind: Pod
metadata:
  name: coredns
  annotations:
    ad.datadoghq.com/coredns.logs: '[{"source": "coredns", "service": "<NOM_SERVICE>"}]'
  labels:
    name: coredns

ECS

Pour configurer ce check lorsque l’Agent est exécuté sur ECS :

Collecte de métriques

Définissez des modèles d’intégration Autodiscovery en tant qu’étiquettes Docker sur votre conteneur d’application :

{
  "containerDefinitions": [{
    "name": "coredns",
    "image": "coredns:latest",
    "dockerLabels": {
      "com.datadoghq.ad.check_names": "[\"coredns\"]",
      "com.datadoghq.ad.init_configs": "[{}]",
      "com.datadoghq.ad.instances": "[{\"openmetrics_endpoint\":\"http://%%host%%:9153/metrics\", \"tags\":[\"dns-pod:%%host%%\"]}]"
    }
  }]
}

Pour activer l’ancienne version du check (OpenMetricsBaseCheckV1), remplacez openmetrics_endpoint par prometheus_url :

      "com.datadoghq.ad.instances": "[{\"prometheus_url\":\"http://%%host%%:9153/metrics\", \"tags\":[\"dns-pod:%%host%%\"]}]"

Remarques :

  • Le fichier coredns.d/auto_conf.yaml transmis active par défaut l’option de l’ancien check OpenMetricsBaseCheckV1, à savoir prometheus_url.
  • Le tag dns-pod correspond à l’IP du pod DNS cible. Les autres tags sont associés à l’Agent Datadog qui interroge les informations à l’aide de la découverte de services.
  • Les annotations de découverte de services doivent être effectuées sur le pod. En cas de déploiement, ajoutez les annotations aux métadonnées des spécifications du modèle. Ne les ajoutez pas au niveau des spécifications extérieures.
Collecte de logs

La collecte des logs est désactivée par défaut dans l’Agent Datadog. Pour l’activer, consultez la section Collecte de logs Amazon ECS.

Définissez ensuite des [intégrations de logs][5] en tant qu’étiquettes Docker :

{
  "containerDefinitions": [{
    "name": "coredns",
    "image": "coredns:latest",
    "dockerLabels": {
      "com.datadoghq.ad.logs": "[{\"source\":\"coredns\",\"service\":\"<NOM_SERVICE>\"}]"
    }
  }]
}

Validation

Lancez la sous-commande status de l’Agent et cherchez coredns dans la section Checks.

Données collectées

Métriques

coredns.acl.allowed_requests
(count)
[OpenMetrics V1] Counter of DNS requests being allowed.
Shown as request
coredns.acl.allowed_requests.count
(count)
[OpenMetrics V2] Counter of DNS requests being allowed.
Shown as request
coredns.acl.blocked_requests
(count)
[OpenMetrics V1] Counter of DNS requests being blocked.
Shown as request
coredns.acl.blocked_requests.count
(count)
[OpenMetrics V2] Counter of DNS requests being blocked.
Shown as request
coredns.autopath.success_count
(count)
[OpenMetrics V1] Counter of requests that did autopath.
Shown as request
coredns.autopath.success_count.count
(count)
[OpenMetrics V2] Counter of requests that did autopath.
Shown as request
coredns.build_info
(gauge)
[OpenMetrics V1 and V2] A metric with a constant '1' value labeled by version, revision, and goversion from which CoreDNS was built.
coredns.response_code_count
(count)
[OpenMetrics V1] number of responses per zone and rcode
coredns.response_code_count.count
(count)
[OpenMetrics V2] number of responses per zone and rcode
coredns.cache_drops_count
(count)
[OpenMetrics V1] Counter of responses excluded from the cache due to request/response question name mismatch.
Shown as response
coredns.cache_drops_count.count
(count)
[OpenMetrics V2] Counter of responses excluded from the cache due to request/response question name mismatch.
Shown as response
coredns.cache_hits_count
(count)
[OpenMetrics V1] Counter of cache hits by cache type
Shown as hit
coredns.cache_hits_count.count
(count)
[OpenMetrics V2] Counter of cache hits by cache type
Shown as hit
coredns.cache_misses_count
(count)
[OpenMetrics V1] Counter of cache misses.
Shown as miss
coredns.cache_misses_count.count
(count)
[OpenMetrics V2] Counter of cache misses.
Shown as miss
coredns.cache_request_count
(count)
[OpenMetrics V1] Counter of cache requests.
Shown as request
coredns.cache_request_count.count
(count)
[OpenMetrics V2] Counter of cache requests.
Shown as request
coredns.cache_prefetch_count
(count)
[OpenMetrics V1] The number of time the cache has prefetched a cached item.
coredns.cache_prefetch_count.count
(count)
[OpenMetrics V2] The number of time the cache has prefetched a cached item.
coredns.cache_stale_count
(count)
[OpenMetrics V1] Counter of requests served from stale cache entries.
Shown as request
coredns.cache_stale_count.count
(count)
[OpenMetrics V2] Counter of requests served from stale cache entries.
Shown as request
coredns.dnssec.cache_size
(gauge)
[OpenMetrics V1 and V2] Total elements in the cache, type is signature.
coredns.dnssec.cache_hits
(count)
[OpenMetrics V1] Counter of cache hits.
Shown as hit
coredns.dnssec.cache_hits.count
(count)
[OpenMetrics V2] Counter of cache hits.
Shown as hit
coredns.dnssec.cache_misses
(count)
[OpenMetrics V1] Counter of cache misses.
Shown as miss
coredns.dnssec.cache_misses.count
(count)
[OpenMetrics V2] Counter of cache misses.
Shown as miss
coredns.request_count
(count)
[OpenMetrics V1] total query count.
Shown as request
coredns.request_count.count
(count)
[OpenMetrics V2] total query count.
Shown as request
coredns.request_type_count
(count)
[OpenMetrics V1] counter of queries per zone and type
coredns.request_type_count.count
(count)
[OpenMetrics V2] counter of queries per zone and type
coredns.request_duration.seconds.sum
(count)
[OpenMetrics V1 and V2] duration to process each query
Shown as second
coredns.request_duration.seconds.count
(count)
[OpenMetrics V1 and V2] duration to process each query
Shown as second
coredns.request_duration.seconds.bucket
(count)
[OpenMetrics V2] sample duration to process each query
Shown as second
coredns.proxy_request_count
(count)
[OpenMetrics V1] query count per upstream.
Shown as request
coredns.proxy_request_count.count
(count)
[OpenMetrics V2] query count per upstream.
Shown as request
coredns.proxy_request_duration.seconds.sum
(count)
[OpenMetrics V1 and V2] duration per upstream interaction
Shown as second
coredns.proxy_request_duration.seconds.count
(count)
[OpenMetrics V1 and V2] duration per upstream interaction
Shown as second
coredns.proxy_request_duration.seconds.bucket
(count)
[OpenMetrics V2] sample of duration per upstream interaction
Shown as second
coredns.forward_request_duration.seconds.sum
(count)
[OpenMetrics V1 and V2] duration per upstream interaction
Shown as second
coredns.forward_request_duration.seconds.count
(count)
[OpenMetrics V1 and V2] duration per upstream interaction
Shown as second
coredns.forward_request_duration.seconds.bucket
(count)
[OpenMetrics V2] duration per upstream interaction
Shown as second
coredns.forward_request_count
(count)
[OpenMetrics V1] query count per upstream
Shown as request
coredns.forward_request_count.count
(count)
[OpenMetrics V2] query count per upstream
Shown as request
coredns.forward_response_rcode_count
(count)
[OpenMetrics V1] count of RCODEs per upstream
Shown as response
coredns.forward_response_rcode_count.count
(count)
[OpenMetrics V2] count of RCODEs per upstream
Shown as response
coredns.forward_healthcheck_failure_count
(count)
[OpenMetrics V1] number of failed health checks per upstream
Shown as entry
coredns.forward_healthcheck_failure_count.count
(count)
[OpenMetrics V2] number of failed health checks per upstream
Shown as entry
coredns.forward_healthcheck_broken_count
(count)
[OpenMetrics V1] counter of when all upstreams are unhealthy
Shown as entry
coredns.forward_healthcheck_broken_count.count
(count)
[OpenMetrics V2] counter of when all upstreams are unhealthy
Shown as entry
coredns.forward_max_concurrent_rejects
(count)
[OpenMetrics V1] Counter of the number of queries rejected because the concurrent queries were at maximum.
Shown as query
coredns.forward_max_concurrent_rejects.count
(count)
[OpenMetrics V2] Counter of the number of queries rejected because the concurrent queries were at maximum.
Shown as query
coredns.forward_sockets_open
(gauge)
[OpenMetrics V1 and V2] number of sockets open per upstream
Shown as connection
coredns.grpc.request_count
(count)
[OpenMetrics V1] Query count per upstream.
coredns.grpc.request_count.count
(count)
[OpenMetrics V2] Query count per upstream.
coredns.grpc.response_rcode_count
(count)
[OpenMetrics V1] Count of RCODEs per upstream. and we are randomly (this always uses the random policy) spraying to an upstream.
coredns.grpc.response_rcode_count.count
(count)
[OpenMetrics V2] Count of RCODEs per upstream. and we are randomly (this always uses the random policy) spraying to an upstream.
coredns.health_request_duration.count
(count)
[OpenMetrics V1 and V2] Count for the histogram of the time (in seconds) each request took.
coredns.health_request_duration.sum
(count)
[OpenMetrics V1 and V2] Sum for the histogram of the time (in seconds) each request took.
coredns.health_request_duration.bucket
(count)
[OpenMetrics V2] Sample for the histogram of the time (in seconds) each request took.
coredns.hosts.entries_count
(gauge)
[OpenMetrics V1 and V2] The combined number of entries in hosts and Corefile.
coredns.hosts.reload_timestamp
(gauge)
[OpenMetrics V1 and V2] The timestamp of the last reload of hosts file.
Shown as second
coredns.reload.failed_count
(count)
[OpenMetrics V1] Counts the number of failed reload attempts.
coredns.reload.failed_count.count
(count)
[OpenMetrics V2] Counts the number of failed reload attempts.
coredns.request_size.bytes.sum
(count)
[OpenMetrics V1 and V2] size of the request in bytes
Shown as byte
coredns.request_size.bytes.count
(count)
[OpenMetrics V1 and V2] size of the request in bytes
Shown as byte
coredns.request_size.bytes.bucket
(count)
[OpenMetrics V2] sample size of the request in bytes
Shown as byte
coredns.response_size.bytes.sum
(count)
[OpenMetrics V1 and V2] size of the request in bytes
Shown as byte
coredns.response_size.bytes.count
(count)
[OpenMetrics V1 and V2] size of the request in bytes
Shown as byte
coredns.response_size.bytes.bucket
(count)
[OpenMetrics V2] sample size of the request in bytes
Shown as byte
coredns.cache_size.count
(gauge)
[OpenMetrics V1 and V2]
Shown as entry
coredns.panic_count.count
(count)
[OpenMetrics V1 and V2]
Shown as entry
coredns.go.gc_duration_seconds.count
(count)
[OpenMetrics V1 and V2] Count of the GC invocation durations.
Shown as second
coredns.go.gc_duration_seconds.sum
(count)
[OpenMetrics V1 and V2] Sum of the GC invocation durations.
Shown as second
coredns.go.gc_duration_seconds.quantile
(gauge)
[OpenMetrics V1 and V2] Quantiles of the GC invocation durations.
Shown as second
coredns.go.goroutines
(gauge)
[OpenMetrics V1 and V2] Number of goroutines that currently exist.
Shown as thread
coredns.go.info
(gauge)
[OpenMetrics V1 and V2] Information about the Go environment.
coredns.go.memstats.alloc_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes allocated and still in use.
Shown as byte
coredns.go.memstats.alloc_bytes_total
(count)
[OpenMetrics V1] Total number of bytes allocated even if freed.
Shown as byte
coredns.go.memstats.buck_hash_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used by the profiling bucket hash table.
Shown as byte
coredns.go.memstats.frees_total
(count)
[OpenMetrics V1] Total number of frees.
coredns.go.memstats.frees_total.count
(count)
[OpenMetrics V2] Total number of frees.
coredns.go.memstats.gc_cpu_fraction
(gauge)
[OpenMetrics V1 and V2] CPU taken up by GC
Shown as percent
coredns.go.memstats.gc_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used for garbage collection system metadata.
Shown as byte
coredns.go.memstats.heap_alloc_bytes
(gauge)
[OpenMetrics V1 and V2] Bytes allocated to the heap
Shown as byte
coredns.go.memstats.heap_idle_bytes
(gauge)
[OpenMetrics V1 and V2] Number of idle bytes in the heap
Shown as byte
coredns.go.memstats.heap_inuse_bytes
(gauge)
[OpenMetrics V1 and V2] Number of Bytes in the heap
Shown as byte
coredns.go.memstats.heap_objects
(gauge)
[OpenMetrics V1 and V2] Number of objects in the heap
Shown as object
coredns.go.memstats.heap_released_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes released to the system in the last gc
Shown as byte
coredns.go.memstats.heap_released_bytes.count
(count)
[OpenMetrics V2] Count of bytes released to the system in the last gc
Shown as byte
coredns.go.memstats.heap_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used by the heap
Shown as byte
coredns.go.memstats.last_gc_time_seconds
(gauge)
[OpenMetrics V1 and V2] Length of last GC
Shown as second
coredns.go.memstats.lookups_total
(count)
[OpenMetrics V1] Number of lookups
Shown as operation
coredns.go.memstats.lookups_total.count
(count)
[OpenMetrics V2] Number of lookups
Shown as operation
coredns.go.memstats.mallocs_total
(count)
[OpenMetrics V1] Number of mallocs
Shown as operation
coredns.go.memstats.mallocs_total.count
(count)
[OpenMetrics V2] Number of mallocs
Shown as operation
coredns.go.memstats.mcache_inuse_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes in use by mcache structures.
Shown as byte
coredns.go.memstats.mcache_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used for mcache structures obtained from system.
Shown as byte
coredns.go.memstats.mspan_inuse_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes in use by mspan structures.
Shown as byte
coredns.go.memstats.mspan_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used for mspan structures obtained from system.
Shown as byte
coredns.go.memstats.next_gc_bytes
(gauge)
[OpenMetrics V1 and V2] Number of heap bytes when next garbage collection will take place
Shown as byte
coredns.go.memstats.other_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes used for other system allocations
Shown as byte
coredns.go.memstats.stack_inuse_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes in use by the stack allocator
Shown as byte
coredns.go.memstats.stack_sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes obtained from system for stack allocator
Shown as byte
coredns.go.memstats.sys_bytes
(gauge)
[OpenMetrics V1 and V2] Number of bytes obtained from system
Shown as byte
coredns.go.threads
(gauge)
[OpenMetrics V1 and V2] Number of OS threads created.
Shown as thread
coredns.plugin_enabled
(gauge)
[OpenMetrics V1 and V2] A metric that indicates whether a plugin is enabled on per server and zone basis.
coredns.process.cpu_seconds_total
(count)
[OpenMetrics V1 and V2] Total user and system CPU time spent in seconds.
Shown as second
coredns.process.cpu_seconds_total.count
(count)
[OpenMetrics V2] Count of user and system CPU time spent in seconds.
Shown as second
coredns.process.max_fds
(gauge)
[OpenMetrics V1 and V2] Maximum number of open file descriptors.
Shown as file
coredns.process.open_fds
(gauge)
[OpenMetrics V1 and V2] Number of open file descriptors.
Shown as file
coredns.process.resident_memory_bytes
(gauge)
[OpenMetrics V1 and V2] Resident memory size in bytes.
Shown as byte
coredns.process.start_time_seconds
(gauge)
[OpenMetrics V1 and V2] Start time of the process since unix epoch in seconds.
Shown as second
coredns.process.virtual_memory_bytes
(gauge)
[OpenMetrics V1 and V2] Virtual memory size in bytes.
Shown as byte
coredns.template.matches_count
(count)
[OpenMetrics V1] The total number of matched requests by regex.
coredns.template.matches_count.count
(count)
[OpenMetrics V2] The total number of matched requests by regex.
coredns.template.failures_count
(count)
[OpenMetrics V1] The number of times the Go templating failed.
Shown as error
coredns.template.failures_count.count
(count)
[OpenMetrics V2] The number of times the Go templating failed.
Shown as error
coredns.template.rr_failures_count
(count)
[OpenMetrics V1] The number of times the templated resource record was invalid and could not be parsed.
Shown as error
coredns.template.rr_failures_count.count
(count)
[OpenMetrics V2] The number of times the templated resource record was invalid and could not be parsed.
Shown as error

Événements

Le check CoreDNS n’inclut aucun événement.

Checks de service

coredns.prometheus.health
Returns CRITICAL if the check cannot access the metrics endpoint. Returns OK otherwise.
Statuses: ok, critical

Dépannage

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