Prometheus-operator对k8s组件的监控

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Prometheus-operator对k8s组件的监控

prometheus-opreator对于k8s组件是默认安装时就自动配置了对应得servicemonitor，但是我的集群一些组件是静态pod方式启动的，所以我需要改改

kube-scheduler的ServiceMonitor

查看ServiceMonitor

[root@k8s-master ~]# kubectl get servicemonitor -n monitoring kube-scheduler -o yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"monitoring.coreos.com/v1","kind":"ServiceMonitor","metadata":{"annotations":{},"labels":{"k8s-app":"kube-scheduler"},"name":"kube-scheduler","namespace":"monitoring"},"spec":{"endpoints":[{"interval":"30s","port":"http-metrics"}],"jobLabel":"k8s-app","namespaceSelector":{"matchNames":["kube-system"]},"selector":{"matchLabels":{"k8s-app":"kube-scheduler"}}}}
  creationTimestamp: "2020-08-26T04:47:11Z"
  generation: 1
  labels:
    k8s-app: kube-scheduler
  managedFields:
  - apiVersion: monitoring.coreos.com/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .: {}
          f:kubectl.kubernetes.io/last-applied-configuration: {}
        f:labels:
          .: {}
          f:k8s-app: {}
      f:spec:
        .: {}
        f:endpoints: {}
        f:jobLabel: {}
        f:namespaceSelector:
          .: {}
          f:matchNames: {}
        f:selector:
          .: {}
          f:matchLabels:
            .: {}
            f:k8s-app: {}
    manager: kubectl
    operation: Update
    time: "2020-08-26T04:47:11Z"
  name: kube-scheduler
  namespace: monitoring
  resourceVersion: "869690"
  selfLink: /apis/monitoring.coreos.com/v1/namespaces/monitoring/servicemonitors/kube-scheduler
  uid: 7a2cd417-0682-49e6-89e8-df53d6a9c1b5
spec:
  endpoints:
  - interval: 30s
    port: http-metrics
  jobLabel: k8s-app
  namespaceSelector:
    matchNames:
    - kube-system
  selector:
    matchLabels:
      k8s-app: kube-scheduler

创建kube-scheduler svc

从上面得servicemonitor中可以看到对kube-scheduler使用selector得标签为k8s-app: kube-scheduler，且抓取得端口名字为：http-metrics，所以我们需要为kube-scheduler创建一个符合上述条件得svc，kube-scheduler得监控服务端口为10251

[root@k8s-master ~]# cat kube-scheduler-svc.yaml
apiVersion: v1
kind: Service
metadata:
  namespace: kube-system
  name: kube-scheduler
  labels:
    k8s-app: kube-scheduler
spec:
  selector:
    component: kube-scheduler
  ports:
  - name: http-metrics
    port: 10251
    targetPort: 10251
    protocol: TCP
    
[root@k8s-master kube-scheduler]# kubectl apply -f kube-scheduler-svc.yaml
service/kube-scheduler created
[root@k8s-master kube-scheduler]#
[root@k8s-master kube-scheduler]# kubectl get -f kube-scheduler-svc.yaml
NAME             TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)     AGE
kube-scheduler   ClusterIP   10.96.29.112   <none>        10251/TCP   15s

此时登录prometheus查看该组件的target中已有endpoint，但是该endpoint报地址无法连接

Prometheus-operator对k8s组件的监控

curl测试下似乎真的无法访问，突然想起我的kube-scheduler是静态pod的hostnetwork方式部署，查看下是不是监听的地址问题

[root@k8s-master manifests]# cat kube-scheduler.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-scheduler
    tier: control-plane
  name: kube-scheduler
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-scheduler
    - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
    - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
    - --bind-address=127.0.0.1
    - --kubeconfig=/etc/kubernetes/scheduler.conf
    - --leader-elect=true
    - --port=0
    image: registry.aliyuncs.com/k8sxio/kube-scheduler:v1.18.9
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10259
        scheme: HTTPS
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-scheduler
    resources:
      requests:
        cpu: 100m
    volumeMounts:
    - mountPath: /etc/kubernetes/scheduler.conf
      name: kubeconfig
      readOnly: true
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /etc/kubernetes/scheduler.conf
      type: FileOrCreate
    name: kubeconfig
status: {}

看来我们需要将监听地址修改为0.0.0.0才行，修改后如下

[root@k8s-master manifests]# cat kube-scheduler.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-scheduler
    tier: control-plane
  name: kube-scheduler
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-scheduler
    - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
    - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
    - --bind-address=0.0.0.0
    - --kubeconfig=/etc/kubernetes/scheduler.conf
    - --leader-elect=true
    - --port=0
    image: registry.aliyuncs.com/k8sxio/kube-scheduler:v1.18.9
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10259
        scheme: HTTPS
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-scheduler
    resources:
      requests:
        cpu: 100m
    volumeMounts:
    - mountPath: /etc/kubernetes/scheduler.conf
      name: kubeconfig
      readOnly: true
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /etc/kubernetes/scheduler.conf
      type: FileOrCreate
    name: kubeconfig
status: {}

但是还是发现没有10251端口(+_+)?

[root@k8s-master kube-scheduler]# netstat -tunlp | grep 10251

查看启动日志也没有报错

[root@k8s-master kube-scheduler]# kubectl logs -n kube-system kube-scheduler-k8s-master
I0903 07:27:06.803726       1 registry.go:150] Registering EvenPodsSpread predicate and priority function
I0903 07:27:06.803818       1 registry.go:150] Registering EvenPodsSpread predicate and priority function
I0903 07:27:07.419715       1 serving.go:313] Generated self-signed cert in-memory
I0903 07:27:08.549379       1 registry.go:150] Registering EvenPodsSpread predicate and priority function
I0903 07:27:08.549423       1 registry.go:150] Registering EvenPodsSpread predicate and priority function
I0903 07:27:08.552835       1 configmap_cafile_content.go:202] Starting client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0903 07:27:08.552946       1 shared_informer.go:223] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0903 07:27:08.552804       1 configmap_cafile_content.go:202] Starting client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0903 07:27:08.553160       1 shared_informer.go:223] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0903 07:27:08.553441       1 secure_serving.go:178] Serving securely on [::]:10259
I0903 07:27:08.553595       1 tlsconfig.go:240] Starting DynamicServingCertificateController
I0903 07:27:08.653415       1 shared_informer.go:230] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0903 07:27:08.653531       1 shared_informer.go:230] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0903 07:27:08.654134       1 leaderelection.go:242] attempting to acquire leader lease  kube-system/kube-scheduler...
I0903 07:27:26.377070       1 leaderelection.go:252] successfully acquired lease kube-system/kube-scheduler

一顿搜索后是启动参数–port=0的影响，需要将此注释即可

[root@k8s-master kube-scheduler]# kubectl get cs
NAME                 STATUS      MESSAGE                                                                                     ERROR
controller-manager   Unhealthy   Get http://127.0.0.1:10252/healthz: dial tcp 127.0.0.1:10252: connect: connection refused
scheduler            Unhealthy   Get http://127.0.0.1:10251/healthz: dial tcp 127.0.0.1:10251: connect: connection refused
etcd-0               Healthy     {"health":"true"}

注释完成后该组件endpoint恢复up状态

Prometheus-operator对k8s组件的监控
Prometheus-operator对k8s组件的监控

kube-controller-manager的ServiceMonitor

查看ServiceMonitor

[root@k8s-master manifests]# kubectl get servicemonitor -n monitoring kube-controller-manager -o yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    k8s-app: kube-controller-manager
  name: kube-controller-manager
  namespace: monitoring
  resourceVersion: "60057"
  selfLink: /apis/monitoring.coreos.com/v1/namespaces/monitoring/servicemonitors/kube-controller-manager
  uid: f2671f29-cc89-40d4-ba5a-ac66fd82530c
spec:
  endpoints:
  - interval: 30s
    metricRelabelings:
    - action: drop
      regex: kubelet_(pod_worker_latency_microseconds|pod_start_latency_microseconds|cgroup_manager_latency_microseconds|pod_worker_start_latency_microseconds|pleg_relist_latency_microseconds|pleg_relist_interval_microseconds|runtime_operations|runtime_operations_latency_microseconds|runtime_operations_errors|eviction_stats_age_microseconds|device_plugin_registration_count|device_plugin_alloc_latency_microseconds|network_plugin_operations_latency_microseconds)
      sourceLabels:
      - __name__
    - action: drop
      regex: scheduler_(e2e_scheduling_latency_microseconds|scheduling_algorithm_predicate_evaluation|scheduling_algorithm_priority_evaluation|scheduling_algorithm_preemption_evaluation|scheduling_algorithm_latency_microseconds|binding_latency_microseconds|scheduling_latency_seconds)
      sourceLabels:
      - __name__
    - action: drop
      regex: apiserver_(request_count|request_latencies|request_latencies_summary|dropped_requests|storage_data_key_generation_latencies_microseconds|storage_transformation_failures_total|storage_transformation_latencies_microseconds|proxy_tunnel_sync_latency_secs)
      sourceLabels:
      - __name__
    - action: drop
      regex: kubelet_docker_(operations|operations_latency_microseconds|operations_errors|operations_timeout)
      sourceLabels:
      - __name__
    - action: drop
      regex: reflector_(items_per_list|items_per_watch|list_duration_seconds|lists_total|short_watches_total|watch_duration_seconds|watches_total)
      sourceLabels:
      - __name__
    - action: drop
      regex: etcd_(helper_cache_hit_count|helper_cache_miss_count|helper_cache_entry_count|request_cache_get_latencies_summary|request_cache_add_latencies_summary|request_latencies_summary)
      sourceLabels:
      - __name__
    - action: drop
      regex: transformation_(transformation_latencies_microseconds|failures_total)
      sourceLabels:
      - __name__
    - action: drop
      regex: (admission_quota_controller_adds|crd_autoregistration_controller_work_duration|APIServiceOpenAPIAggregationControllerQueue1_adds|AvailableConditionController_retries|crd_openapi_controller_unfinished_work_seconds|APIServiceRegistrationController_retries|admission_quota_controller_longest_running_processor_microseconds|crdEstablishing_longest_running_processor_microseconds|crdEstablishing_unfinished_work_seconds|crd_openapi_controller_adds|crd_autoregistration_controller_retries|crd_finalizer_queue_latency|AvailableConditionController_work_duration|non_structural_schema_condition_controller_depth|crd_autoregistration_controller_unfinished_work_seconds|AvailableConditionController_adds|DiscoveryController_longest_running_processor_microseconds|autoregister_queue_latency|crd_autoregistration_controller_adds|non_structural_schema_condition_controller_work_duration|APIServiceRegistrationController_adds|crd_finalizer_work_duration|crd_naming_condition_controller_unfinished_work_seconds|crd_openapi_controller_longest_running_processor_microseconds|DiscoveryController_adds|crd_autoregistration_controller_longest_running_processor_microseconds|autoregister_unfinished_work_seconds|crd_naming_condition_controller_queue_latency|crd_naming_condition_controller_retries|non_structural_schema_condition_controller_queue_latency|crd_naming_condition_controller_depth|AvailableConditionController_longest_running_processor_microseconds|crdEstablishing_depth|crd_finalizer_longest_running_processor_microseconds|crd_naming_condition_controller_adds|APIServiceOpenAPIAggregationControllerQueue1_longest_running_processor_microseconds|DiscoveryController_queue_latency|DiscoveryController_unfinished_work_seconds|crd_openapi_controller_depth|APIServiceOpenAPIAggregationControllerQueue1_queue_latency|APIServiceOpenAPIAggregationControllerQueue1_unfinished_work_seconds|DiscoveryController_work_duration|autoregister_adds|crd_autoregistration_controller_queue_latency|crd_finalizer_retries|AvailableConditionController_unfinished_work_seconds|autoregister_longest_running_processor_microseconds|non_structural_schema_condition_controller_unfinished_work_seconds|APIServiceOpenAPIAggregationControllerQueue1_depth|AvailableConditionController_depth|DiscoveryController_retries|admission_quota_controller_depth|crdEstablishing_adds|APIServiceOpenAPIAggregationControllerQueue1_retries|crdEstablishing_queue_latency|non_structural_schema_condition_controller_longest_running_processor_microseconds|autoregister_work_duration|crd_openapi_controller_retries|APIServiceRegistrationController_work_duration|crdEstablishing_work_duration|crd_finalizer_adds|crd_finalizer_depth|crd_openapi_controller_queue_latency|APIServiceOpenAPIAggregationControllerQueue1_work_duration|APIServiceRegistrationController_queue_latency|crd_autoregistration_controller_depth|AvailableConditionController_queue_latency|admission_quota_controller_queue_latency|crd_naming_condition_controller_work_duration|crd_openapi_controller_work_duration|DiscoveryController_depth|crd_naming_condition_controller_longest_running_processor_microseconds|APIServiceRegistrationController_depth|APIServiceRegistrationController_longest_running_processor_microseconds|crd_finalizer_unfinished_work_seconds|crdEstablishing_retries|admission_quota_controller_unfinished_work_seconds|non_structural_schema_condition_controller_adds|APIServiceRegistrationController_unfinished_work_seconds|admission_quota_controller_work_duration|autoregister_depth|autoregister_retries|kubeproxy_sync_proxy_rules_latency_microseconds|rest_client_request_latency_seconds|non_structural_schema_condition_controller_retries)
      sourceLabels:
      - __name__
    - action: drop
      regex: etcd_(debugging|disk|request|server).*
      sourceLabels:
      - __name__
    port: http-metrics
  jobLabel: k8s-app
  namespaceSelector:
    matchNames:
    - kube-system
  selector:
    matchLabels:
      k8s-app: kube-controller-manager

创建kube-controller-manager svc

从上面得servicemonitor中可以看到对kube-controller-manager使用selector得标签为k8s-app: kube-controller-manager，且抓取得端口名字为：http-metrics，所以我们需要为kube-controller-manager创建一个符合上述条件得svc，kube-controller-manager得监控服务端口为10252

[root@k8s-master ~]# cat >kube-controller-manager-k8s-master-svc.yaml<<-'EOF'
apiVersion: v1
kind: Service
metadata:
  namespace: kube-system
  name: kube-controller-manager
  labels:
    k8s-app: kube-controller-manager
spec:
  selector:
    component: kube-controller-manager
  ports:
  - name: http-metrics
    port: 10252
    targetPort: 10252
    protocol: TCP
EOF
[root@k8s-master ~]# kubectl apply -f kube-controller-manager-k8s-master-svc.yaml
service/kube-controller-manager created

prometheus报和kube-scheduler一样的错误，按相同的方式修改即可：

Get http://192.168.44.151:10252/metrics: dial tcp 192.168.44.151:10252: connect: connection refused，
# 修改完后组件状态正常
[root@k8s-master manifests]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok
controller-manager   Healthy   ok
etcd-0               Healthy   {"health":"true"}
Prometheus-operator对k8s组件的监控
Prometheus-operator对k8s组件的监控

正文完
k8s prometheus
2020-08-26
 
xadocker
版权声明：本站原创文章，由 xadocker 2020-08-26发表，共计13472字。
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