Memcached Pods monitoring (via Prometheus)

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Metrics

• Memory usage
• Hit & Miss ratio
• Evicts & Reclaims
• Items in cache
• Network stats
• Commands usage

Requirements

1. Kubernetes cluster with deployed Prometheus and Grafana.
2. Memcached Exporter deployed alongside with Memcached Pod.

Your Prometheus configuration should contain the following scrape_config:

scrape_configs:
  - 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

Your Memcached Pod should contain prometheus.io/* annotations:

kind: StatefulSet
apiVersion: apps/v1beta1
metadata:
  name: my-memcached
spec:
  serviceName: my-memcached
  replicas: 1
  template:
    metadata:
      annotations:
        prometheus.io/scrape: 'true'
        prometheus.io/port: '9150'
    spec:
      containers:
        - name: memcached
          image: memcached:alpine
          ports:
            - name: memcache
              containerPort: 11211
        - name: metrics
          image: quay.io/prometheus/memcached-exporter:v0.3.0
          ports:
            - name: metrics
              containerPort: 9150

Issues

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