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Version: v1.8

Use Prometheus to monitor Karmada member clusters

Prometheus, a Cloud Native Computing Foundation project, is a system and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed.

This document gives an example to demonstrate how to use the Prometheus to monitor Karmada member clusters.

Start up Karmada clusters

You just need to clone Karmada repo, and run the following script in Karmada directory.

hack/local-up-karmada.sh

Start Prometheus

  1. Create resource objects of Prometheus, the content is as follows.

    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. Run the below command to execute Karmada PropagationPolicy and 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. Use any node IP of the member cluster and the port number (default 30003) to enter the Prometheus monitoring page of the member cluster

Reference