prometheus 监控pod中的php-fpm

基本原理

php-fpm 接入容器后需要对fpm 的状态做监控， 这里选用这个插件php-fpm-exporter，基本原理就是开启php-fpm的状态页面，然后这个插件读取状态页的信息并装换为prometheus 格式的metrics接口供prometheus 采集

步骤

1. php开启状态页和慢日志

ping.path = /ping
ping.response = pong
pm.status_path = /php-status
access.log = var/log/$pool.access.log
access.format = "%R - %u %t \"%m %r%Q%q\" %s %f %{mili}d %{kilo}M %C%%"
slowlog = /usr/local/php71/var/log/$pool.log.slow
request_slowlog_timeout = 3s

2. 获取插件并配置

获取二进制，通过supervisor 或者sidecar 方式启动,具体参数可以参考GitHub,

php-fpm-exporter --addr 0.0.0.0:9999 --fastcgi tcp://127.0.0.1:9000/php-status

3. prometheus配置自动发现

在对应的服务中，添加自动发现注解

# deployment中添加注解
spec:
  replicas: 10
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: fpm-monitoring-test
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
    # 添加部分
      annotations:
        prometheus.io/port: "9999" # 对应启动命令中的--addr 参数
        prometheus.io/scrape: php-fpm

4. prometheus配置采集

因为使用的是prometheus-operator，无法直接操作prometheus的配置， 这里采用additionalScrapeConfigs的方式， 将配置保存为一个密文，并挂载到prometheus中

# cat prometheus-addition-config.yaml
- job_name: 'kubernetes-php-fpm'
  kubernetes_sd_configs:
  - role: pod
  relabel_configs:
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
    action: keep
    regex: php-fpm
  - 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: namespace
  - source_labels: [__meta_kubernetes_pod_name]
    action: replace
    target_label: pod
# kubectl create  secret  generic  -n monitoring prometheus-addition-config --from-file=prometheus-addition-config.yaml
# kubectl edit prometheus -n monitoring k8s
...部分省略
spec:
  additionalScrapeConfigs:   # 增加部分
    key: prometheus-addition-config.yaml   # 增加部分
    name: prometheus-addition-config   # 增加部分
  alerting:
    alertmanagers:
    - name: alertmanager-main
      namespace: monitoring
      port: web
  arbitraryFSAccessThroughSMs: {}
  baseImage: registry.cn-shanghai.aliyuncs.com/leozhanggg/prometheus/prometheus
  externalUrl: http://prometheus.piggy.xiaozhu.com
  nodeSelector:
    kubernetes.io/os: linux
  podMonitorSelector: {}
  ...

5. 查看prometheus是否抓取到数据

   
   p.png
   

   6.导入grafana 数据
   dashboardID: 13281