4.5. 访问registry的指标数据（metrics）

流程

1. 如果还没有一个访问指标的集群角色，创建一个集群角色：

   $ 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. 输入以下命令在用户帐户中添加集群角色：

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

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3. 对于指标查询，获取用户令牌。

   openshift:
   $ oc whoami -t

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4. 在节点或 pod 中运行指标查询。以下示例命令和输出演示了此任务。

   $ 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 &gt ; : <user > 对象可以是任意对象，但 <secret > 标签必须使用用户令牌。

     # 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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