Cluster Agent 트러블슈팅

이 설명서에는 다음 구성 요소에 대한 트러블슈팅 정보가 포함되어 있습니다.

Datadog Cluster Agent

Cluster Agent에 대한 트러블슈팅 명령을 실행하려면, 먼저 Cluster Agent 또는 노드 기반 Agent 파드 내부에 있어야 합니다. 이를 위해 다음을 사용하세요:

kubectl exec -it <DATADOG_CLUSTER_AGENT_POD_NAME> bash

Datadog Cluster Agent가 제공하는 클러스터 수준 메타데이터를 확인하려면 다음을 실행하세요:

agent metamap

다음 결과가 표시됩니다:

root@datadog-cluster-agent-8568545574-x9tc9:/# agent metamap

===============
Metadata Mapper
===============

Node detected: gke-test-default-pool-068cb9c0-sf1w

  - Namespace: kube-system
      - Pod: kube-dns-788979dc8f-hzbj5
        Services: [kube-dns]
      - Pod: kube-state-metrics-5587867c9f-xllnm
        Services: [kube-state-metrics]
      - Pod: kubernetes-dashboard-598d75cb96-5khmj
        Services: [kubernetes-dashboard]

Node detected: gke-test-default-pool-068cb9c0-wntj

  - Namespace: default
      - Pod: datadog-cluster-agent-8568545574-x9tc9
        Services: [datadog-custom-metrics-server dca]

  - Namespace: kube-system
      - Pod: heapster-v1.5.2-6d59ff54cf-g7q4h
        Services: [heapster]
      - Pod: kube-dns-788979dc8f-q9qkt
        Services: [kube-dns]
      - Pod: l7-default-backend-5d5b9874d5-b2lts
        Services: [default-http-backend]
      - Pod: metrics-server-v0.2.1-7486f5bd67-v827f
        Services: [metrics-server]

Datadog Cluster Agent가 쿼리되고 있는지 확인하려면 다음을 찾으세요:

root@datadog-cluster-agent-8568545574-x9tc9:/# tail -f /var/log/datadog/cluster-agent.log
2018-06-11 09:37:20 UTC | DEBUG | (metadata.go:40 in GetPodMetadataNames) | CacheKey: agent/KubernetesMetadataMapping/ip-192-168-226-77.ec2.internal, with 1 services
2018-06-11 09:37:20 UTC | DEBUG | (metadata.go:40 in GetPodMetadataNames) | CacheKey: agent/KubernetesMetadataMapping/ip-192-168-226-77.ec2.internal, with 1 services

이벤트를 제대로 수집하지 않는 경우, DD_LEADER_ELECTION과 DD_COLLECT_KUBERNETES_EVENTS가 true으로 설정되어 있는지 확인하고, RBAC에 나열된 적절한 동사(특히 watch events)를 확인하세요.

이를 활성화한 경우, 다음 명령을 사용하여 리더 선출 상태와 kube_apiserver 검사를 확인하세요:

agent status

이것으로 다음과 같은 결과가 생성됩니다:

root@datadog-cluster-agent-8568545574-x9tc9:/# agent status
[...]
  Leader Election
  ===============
    Leader Election Status:  Running
    Leader Name is: datadog-cluster-agent-8568545574-x9tc9
    Last Acquisition of the lease: Mon, 11 Jun 2018 06:38:53 UTC
    Renewed leadership: Mon, 11 Jun 2018 09:41:34 UTC
    Number of leader transitions: 2 transitions
[...]
  Running Checks
  ==============
    kubernetes_apiserver
    --------------------
      Total Runs: 736
      Metrics: 0, Total Metrics: 0
      Events: 0, Total Events: 100
      Service Checks: 3, Total Service Checks: 2193
[...]

Node Agent

Agent 상태 명령을 실행하여 Datadog Cluster Agent의 상태를 점검할 수 있습니다: agent status

Datadog Cluster Agent가 활성화되고 올바르게 설정된 경우 다음과 같이 표시됩니다:

[...]
 =====================
 Datadog Cluster Agent
 =====================
   - Datadog Cluster Agent endpoint detected: https://XXX.XXX.XXX.XXX:5005
   Successfully Connected to the Datadog Cluster Agent.
   - Running: {Major:1 Minor:0 Pre:xxx Meta:xxx Commit:xxxxx}

Cluster Agent 서비스가 Agent의 파드보다 먼저 생성되었는지 확인하여 환경 변수에서 DNS를 사용할 수 있도록 합니다:

root@datadog-agent-9d5bl:/# env | grep DATADOG_CLUSTER_AGENT | sort
DATADOG_CLUSTER_AGENT_PORT=tcp://10.100.202.234:5005
DATADOG_CLUSTER_AGENT_PORT_5005_TCP=tcp://10.100.202.234:5005
DATADOG_CLUSTER_AGENT_PORT_5005_TCP_ADDR=10.100.202.234
DATADOG_CLUSTER_AGENT_PORT_5005_TCP_PORT=5005
DATADOG_CLUSTER_AGENT_PORT_5005_TCP_PROTO=tcp
DATADOG_CLUSTER_AGENT_SERVICE_HOST=10.100.202.234
DATADOG_CLUSTER_AGENT_SERVICE_PORT=5005
DATADOG_CLUSTER_AGENT_SERVICE_PORT_AGENTPORT=5005

root@datadog-agent-9d5bl:/# echo ${DD_CLUSTER_AGENT_AUTH_TOKEN}
DD_CLUSTER_AGENT_AUTH_TOKEN=1234****9

참고 자료

Additional helpful documentation, links, and articles:

Datadog Cluster Agent 소개블로그 more more Kubernetes 설치설명서 more more 커스텀 통합설명서 more more