4.5. 레지스트리 메트릭 액세스

프로세스

1. 메트릭에 액세스하는 데 필요한 클러스터 역할이 없는 경우 클러스터 역할을 생성합니다.

   $ cat <<EOF | oc create -f -
   apiVersion: rbac.authorization.k8s.io/v1
   kind: ClusterRole
   metadata:
     name: prometheus-scraper
   rules:
   - apiGroups:
     - image.openshift.io
     resources:
     - registry/metrics
     verbs:
     - get
   EOF

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2. 다음 명령을 입력하여 사용자 계정에 클러스터 역할을 추가합니다.

   $ oc adm policy add-cluster-role-to-user prometheus-scraper <username>

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3. 메트릭 쿼리의 경우 사용자 토큰을 가져옵니다.

   openshift:
   $ oc whoami -t

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4. 노드나 Pod 내부에서 메트릭 쿼리를 실행합니다. 다음 예제 명령과 출력은 이 작업을 보여줍니다.

   $ curl --insecure -s -u <user>:<secret> \ 

   1

   
       https://image-registry.openshift-image-registry.svc:5000/extensions/v2/metrics | grep imageregistry | head -n 20

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   • <user>:<secret> : <user> 객체는 임의적일 수 있지만, <secret> 태그는 사용자 토큰을 사용해야 합니다.

     # HELP imageregistry_build_info A metric with a constant '1' value labeled by major, minor, git commit & git version from which the image registry was built.
     # TYPE imageregistry_build_info gauge
     imageregistry_build_info{gitCommit="9f72191",gitVersion="v3.11.0+9f72191-135-dirty",major="3",minor="11+"} 1
     # HELP imageregistry_digest_cache_requests_total Total number of requests without scope to the digest cache.
     # TYPE imageregistry_digest_cache_requests_total counter
     imageregistry_digest_cache_requests_total{type="Hit"} 5
     imageregistry_digest_cache_requests_total{type="Miss"} 24
     # HELP imageregistry_digest_cache_scoped_requests_total Total number of scoped requests to the digest cache.
     # TYPE imageregistry_digest_cache_scoped_requests_total counter
     imageregistry_digest_cache_scoped_requests_total{type="Hit"} 33
     imageregistry_digest_cache_scoped_requests_total{type="Miss"} 44
     # HELP imageregistry_http_in_flight_requests A gauge of requests currently being served by the registry.
     # TYPE imageregistry_http_in_flight_requests gauge
     imageregistry_http_in_flight_requests 1
     # HELP imageregistry_http_request_duration_seconds A histogram of latencies for requests to the registry.
     # TYPE imageregistry_http_request_duration_seconds summary
     imageregistry_http_request_duration_seconds{method="get",quantile="0.5"} 0.01296087
     imageregistry_http_request_duration_seconds{method="get",quantile="0.9"} 0.014847248
     imageregistry_http_request_duration_seconds{method="get",quantile="0.99"} 0.015981195
     imageregistry_http_request_duration_seconds_sum{method="get"} 12.260727916000022

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