Skip to main content
The Prometheus Memcached Exporter chart deploys the official Prometheus exporter for Memcached, providing detailed cache performance and statistics metrics.

​
What It Monitors

This exporter collects comprehensive Memcached metrics including:
  • Cache hit/miss ratios
  • Memory usage and evictions
  • Connection statistics
  • Item counts and sizes
  • Operations per second
  • Network traffic

​
Installation

​
Basic Installation

helm repo add douban https://douban.github.io/charts
helm install memcached-exporter douban/prometheus-memcached-exporter \
  --set memcached.address="mymemcached:11211"

​
Configuration

​
memcached.address
string
default:"mymc:8881"
required
The address of the Memcached server to monitor (host:port format)
​
argumentsOverride
array
default:"[]"
Override the default exporter arguments completely. Use this for advanced configuration.
​
image.repository
string
default:"prom/memcached-exporter"
Container image repository
​
image.tag
string
default:"v0.9.0"
Container image tag
​
service.port
number
default:"9150"
Port to expose metrics on (standard Memcached exporter port)

​
ServiceMonitor Configuration

To enable automatic Prometheus scraping via the Prometheus Operator: 
serviceMonitor:
  enabled: true
  interval: 30s
  labels:
    prometheus: kube-prometheus
​
serviceMonitor.enabled
boolean
default:"false"
Enable ServiceMonitor resource creation
​
serviceMonitor.interval
string
default:"30s"
How frequently Prometheus should scrape
​
serviceMonitor.telemetryPath
string
default:"/metrics"
Path to scrape metrics from

​
Manual Prometheus Configuration

If not using the Prometheus Operator, add this scrape config: 
scrape_configs:
  - job_name: 'memcached-exporter'
    static_configs:
      - targets: ['memcached-exporter:9150']
    scrape_interval: 30s

​
Advanced Configuration

​
Custom Volumes

You can mount custom configurations: 
volumes:
  - name: custom-config
    configMap:
      name: memcached-exporter-config

volumeMounts:
  - mountPath: /etc/memcached-exporter
    name: custom-config

​
Override Arguments

For complete control over exporter arguments: 
argumentsOverride:
  - "--memcached.address=memcached:11211"
  - "--web.listen-address=:9150"
  - "--memcached.timeout=1s"

​
Prometheus Rules

Example alerting rules: 
prometheusRule:
  enabled: true
  rules:
    - alert: MemcachedDown
      expr: memcached_up == 0
      for: 2m
      labels:
        severity: critical
      annotations:
        summary: Memcached instance down
        description: "Memcached instance {{ $labels.instance }} is unreachable"
    
    - alert: MemcachedHighEvictionRate
      expr: rate(memcached_items_evicted_total[5m]) > 10
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: High eviction rate in Memcached
        description: "Memcached is evicting {{ $value }} items/sec"

​
Example Values

replicaCount: 1

memcached:
  address: "memcached.default.svc.cluster.local:11211"

image:
  repository: prom/memcached-exporter
  tag: "v0.9.0"
  pullPolicy: IfNotPresent

service:
  type: ClusterIP
  port: 9150

serviceMonitor:
  enabled: true
  interval: 15s
  labels:
    release: prometheus

resources:
  limits:
    cpu: 100m
    memory: 64Mi
  requests:
    cpu: 50m
    memory: 32Mi

​
Metrics Exposed

Key metrics available at the /metrics endpoint:
  • memcached_up - Whether the Memcached server is up
  • memcached_current_bytes - Current bytes used
  • memcached_current_items - Current item count
  • memcached_current_connections - Current open connections
  • memcached_commands_total - Total commands processed (get, set, etc.)
  • memcached_items_evicted_total - Total evicted items
  • memcached_hits_total - Total cache hits
  • memcached_misses_total - Total cache misses

​
Resources

Build docs developers (and LLMs) love

Get started for freeTalk to us