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我已经实现了一个ELK 堆栈示例，以使用minikube集中记录我的 k8s 集群。我还部署了一个 cron 作业，以每小时删除 1 天的日志作为示例标题。

因为是在每个小时的开始安排的（schedule: "0 * * * *"），所以我注意到在第一个应用程序时，当新的小时开始时，elasticsearch的 /data文件夹瞬间从14M到2.1M , 表明 cronjob 刚刚删除了旧文件日志。

事实是，几秒钟后，/data文件夹从2.1M变为2.7M，然后又回到2.4M，就像日志每 15-20 秒被删除一次，而不是在每小时开始时。如果我继续监视/data文件夹，它会不断上升和下降。

无论如何/logs文件夹是 13M 并且在某些日子里快速增长，但是 cron 作业根本没有删除它的文件。这也正常吗？

这是我在默认命名空间中部署的基本日志记录 pod：

https://k8s.io/examples/debug/counter-pod.yaml

这是部署在日志命名空间中的弹性搜索部署：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: elasticsearch-pvc # name of PVC essential for identifying the storage data 
  labels:
    k8s-app: elasticsearch-logging 
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
---      
apiVersion: apps/v1
kind: Deployment
metadata:
  name: elasticsearch-logging
  namespace: logging
  labels:
    k8s-app: elasticsearch-logging
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: elasticsearch-logging
  template:
    metadata:
      labels:
        k8s-app: elasticsearch-logging
    spec:
      containers:
      - name: elasticsearch-logging
        image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.3.0
        resources:
          limits:
            cpu: 500m
            memory: 2400Mi
          requests:
            cpu: 100m
            memory: 2350Mi
        ports:
        - containerPort: 9200
          name: db
          protocol: TCP
        - containerPort: 9300
          name: transport
          protocol: TCP
        volumeMounts:
        - name: elasticsearch-logging
          mountPath: /data
        env:
        - name: "NAMESPACE"
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: MINIMUM_MASTER_NODES
          value: "1"
      initContainers:
      - image: registry.hub.docker.com/library/alpine:3.6
        command: ["/sbin/sysctl", "-w", "vm.max_map_count=262144"]
        name: elasticsearch-logging-init
        securityContext:
          privileged: true
      volumes:
      - name: elasticsearch-logging
        persistentVolumeClaim:
          claimName: elasticsearch-pvc   
---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch-logging
  namespace: logging
  labels:
    k8s-app: elasticsearch-logging
spec:
  ports:
  - port: 9200
    protocol: TCP
    targetPort: db
  selector:
    k8s-app: elasticsearch-logging

这是部署在日志命名空间中的cronjob：

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: elasticsearch-curator
  namespace: logging
  labels:
    k8s-app: elasticsearch-logging
spec:
  schedule: "0 * * * *"
  jobTemplate:
    spec:
      template:
        metadata:
          name: elasticsearch-curator
          labels:
            k8s-app: elasticsearch-logging
        spec:
          restartPolicy: "Never"
          containers:
          - name: ingestor
            image: python:3.6-alpine
            args: ["sh", "-c", "pip install elasticsearch-curator && curator_cli --host elasticsearch-logging delete_indices --filter_list '[{\"filtertype\":\"age\",\"source\":\"creation_date\",\"direction\":\"older\",\"unit\":\"days\",\"unit_count\":1},{\"filtertype\":\"pattern\",\"kind\":\"prefix\",\"value\":\"logstash\"}]' || true"]
      backoffLimit: 1

我的 cron 工作有什么问题？

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