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版本:v1.9

使用 Prometheus 来监控 Karmada 成员集群

Prometheus 是一个 云原生计算基金会 项目,是一个系统和服务监控系统。它以给定的时间间隔从配置的目标收集指标,评估规则表达式,显示结果,并在观察到指定条件时触发警报。 本文举例说明如何使用 Prometheus 来监控 Karmada 成员集群。

启动 Karmada 集群

你只需要克隆 Karmada repo,并在 Karmada 目录下运行以下脚本。

hack/local-up-karmada.sh

启动 Prometheus

  1. 创建 Prometheus 的资源对象,内容如下。

    apiVersion: v1
    kind: Namespace
    metadata:
    name: monitor
    labels:
    name: monitor
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
    name: prometheus
    rules:
    - apiGroups: [""]
    resources:
    - nodes
    - nodes/proxy
    - services
    - endpoints
    - pods
    verbs: ["get", "list", "watch"]
    - apiGroups:
    - extensions
    resources:
    - ingresses
    verbs: ["get", "list", "watch"]
    - nonResourceURLs: ["/metrics"]
    verbs: ["get"]
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
    name: prometheus
    namespace: monitor
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
    name: prometheus
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: ClusterRole
    name: prometheus
    subjects:
    - kind: ServiceAccount
    name: prometheus
    namespace: monitor
    ---
    apiVersion: v1
    kind: ConfigMap
    metadata:
    name: prometheus-config
    namespace: monitor
    data:
    prometheus.yml: |
    global:
    scrape_interval: 15s
    evaluation_interval: 15s
    scrape_configs:
    - job_name: 'kubernetes-apiservers'
    kubernetes_sd_configs:
    - role: endpoints
    scheme: https
    tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
    bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
    relabel_configs:
    - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
    action: keep
    regex: default;kubernetes;https
    - job_name: 'kubernetes-nodes'
    kubernetes_sd_configs:
    - role: node
    scheme: https
    tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
    bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
    relabel_configs:
    - action: labelmap
    regex: __meta_kubernetes_node_label_(.+)
    - target_label: __address__
    replacement: kubernetes.default.svc:443
    - source_labels: [__meta_kubernetes_node_name]
    regex: (.+)
    target_label: __metrics_path__
    replacement: /api/v1/nodes/${1}/proxy/metrics
    - job_name: 'kubernetes-cadvisor'
    kubernetes_sd_configs:
    - role: node
    scheme: https
    tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
    bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
    relabel_configs:
    - action: labelmap
    regex: __meta_kubernetes_node_label_(.+)
    - target_label: __address__
    replacement: kubernetes.default.svc:443
    - source_labels: [__meta_kubernetes_node_name]
    regex: (.+)
    target_label: __metrics_path__
    replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor
    - job_name: 'kubernetes-service-endpoints'
    kubernetes_sd_configs:
    - role: endpoints
    relabel_configs:
    - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape]
    action: keep
    regex: true
    - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scheme]
    action: replace
    target_label: __scheme__
    regex: (https?)
    - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_path]
    action: replace
    target_label: __metrics_path__
    regex: (.+)
    - source_labels: [__address__,__meta_kubernetes_service_annotation_prometheus_io_port]
    action: replace
    target_label: __address__
    regex: ([^:]+)(?::\d+)?;(\d+)
    replacement: $1:$2
    - action: labelmap
    regex: __meta_kubernetes_service_label_(.+)
    - source_labels: [__meta_kubernetes_namespace]
    action: replace
    target_label: kubernetes_namespace
    - source_labels: [__meta_kubernetes_service_name]
    action: replace
    target_label: kubernetes_name
    - job_name: 'kubernetes-services'
    kubernetes_sd_configs:
    - role: service
    metrics_path: /probe
    params:
    module: [http_2xx]
    relabel_configs:
    - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_probe]
    action: keep
    regex: true
    - source_labels: [__address__]
    target_label: __param_target
    - target_label: __address__
    replacement: blackbox-exporter.example.com:9115
    - source_labels: [__param_target]
    target_label: instance
    - action: labelmap
    regex: __meta_kubernetes_service_label_(.+)
    - source_labels: [__meta_kubernetes_namespace]
    target_label: kubernetes_namespace
    - source_labels: [__meta_kubernetes_service_name]
    target_label: kubernetes_name
    - job_name: 'kubernetes-ingresses'
    kubernetes_sd_configs:
    - role: ingress
    relabel_configs:
    - source_labels: [__meta_kubernetes_ingress_annotation_prometheus_io_probe]
    action: keep
    regex: true
    - source_labels: [__meta_kubernetes_ingress_scheme,__address__,__meta_kubernetes_ingress_path]
    regex: (.+);(.+);(.+)
    replacement: ${1}://${2}${3}
    target_label: __param_target
    - target_label: __address__
    replacement: blackbox-exporter.example.com:9115
    - source_labels: [__param_target]
    target_label: instance
    - action: labelmap
    regex: __meta_kubernetes_ingress_label_(.+)
    - source_labels: [__meta_kubernetes_namespace]
    target_label: kubernetes_namespace
    - source_labels: [__meta_kubernetes_ingress_name]
    target_label: kubernetes_name
    - job_name: 'kubernetes-pods'
    kubernetes_sd_configs:
    - role: pod
    relabel_configs:
    - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
    action: keep
    regex: true
    - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
    action: replace
    target_label: __metrics_path__
    regex: (.+)
    - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
    action: replace
    regex: ([^:]+)(?::\d+)?;(\d+)
    replacement: $1:$2
    target_label: __address__
    - action: labelmap
    regex: __meta_kubernetes_pod_label_(.+)
    - source_labels: [__meta_kubernetes_namespace]
    action: replace
    target_label: kubernetes_namespace
    - source_labels: [__meta_kubernetes_pod_name]
    action: replace
    target_label: kubernetes_pod_name
    - job_name: kube-state-metrics
    static_configs:
    - targets: ['kube-state-metrics.monitor.svc.cluster.local:8080']
    ---
    kind: Service
    apiVersion: v1
    metadata:
    labels:
    app: prometheus
    name: prometheus
    namespace: monitor
    spec:
    type: NodePort
    ports:
    - port: 9090
    targetPort: 9090
    nodePort: 30003
    selector:
    app: prometheus
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    labels:
    name: prometheus-deployment
    name: prometheus
    namespace: monitor
    spec:
    replicas: 1
    selector:
    matchLabels:
    app: prometheus
    template:
    metadata:
    labels:
    app: prometheus
    spec:
    containers:
    - image: prom/prometheus
    imagePullPolicy: IfNotPresent
    name: prometheus
    command:
    - "/bin/prometheus"
    args:
    - "--config.file=/etc/prometheus/prometheus.yml"
    - "--storage.tsdb.path=/home/prometheus"
    - "--storage.tsdb.retention=168h"
    - "--web.enable-lifecycle"
    ports:
    - containerPort: 9090
    protocol: TCP
    volumeMounts:
    - mountPath: "/home/prometheus"
    name: data
    - mountPath: "/etc/prometheus"
    name: config-volume
    resources:
    requests:
    cpu: 100m
    memory: 256Mi
    limits:
    cpu: 500m
    memory: 3180Mi
    serviceAccountName: prometheus
    securityContext:
    runAsUser: 0
    volumes:
    - name: data
    hostPath:
    path: "/data/prometheus/data"
    - name: config-volume
    configMap:
    name: prometheus-config
  2. 运行下面的命令来执行 Karmada PropagationPolicy 和 ClusterPropagationPolicy。

    cat <<EOF | kubectl apply -f -
    apiVersion: policy.karmada.io/v1alpha1
    kind: PropagationPolicy
    metadata:
    name: prometheus-propagation
    namespace: monitor
    spec:
    resourceSelectors:
    - apiVersion: v1
    kind: Namespace
    name: monitor
    - apiVersion: v1
    kind: ServiceAccount
    name: prometheus
    namespace: monitor
    - apiVersion: v1
    kind: ConfigMap
    name: prometheus-config
    namespace: monitor
    - apiVersion: v1
    kind: Service
    name: prometheus
    namespace: monitor
    - apiVersion: apps/v1
    kind: Deployment
    name: prometheus
    namespace: monitor
    placement:
    clusterAffinity:
    clusterNames:
    - member1
    - member2
    - member3
    EOF
    cat <<EOF | kubectl apply -f -
    apiVersion: policy.karmada.io/v1alpha1
    kind: ClusterPropagationPolicy
    metadata:
    name: prometheusrbac-propagation
    spec:
    resourceSelectors:
    - apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    name: prometheus
    - apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    name: prometheus
    placement:
    clusterAffinity:
    clusterNames:
    - member1
    - member2
    - member3
    EOF
  3. 使用成员集群的任何节点IP和端口号(默认为30003)进入成员集群的 Prometheus 监控页面

参考资料