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# (Opsional) Mengaktifkan fitur Use\$1Kubelet untuk klaster besar
<a name="ContainerInsights-use-kubelet"></a>

Secara default, fitur Use\$1Kubelet dinonaktifkan di plugin Kubernetes. FluentBit Dengan mengaktifkan fitur ini, Anda akan dapat mengurangi lalu lintas ke server API dan mengurangi masalah Server API menjadi hambatan. Kami menyarankan agar Anda mengaktifkan fitur ini untuk klaster besar.

Untuk mengaktifkan Use\$1Kubelet, pertama-tama tambahkan node dan nodes/proxy izin ke konfigurasi ClusterRole.

```
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: fluent-bit-role
rules:
  - nonResourceURLs:
      - /metrics
    verbs:
      - get
  - apiGroups: [""]
    resources:
      - namespaces
      - pods
      - pods/logs
      - nodes
      - nodes/proxy
    verbs: ["get", "list", "watch"]
```

Dalam DaemonSet konfigurasi, fitur ini membutuhkan akses jaringan host. Versi citra untuk `amazon/aws-for-fluent-bit` harus versi 2.12.0 atau versi yang lebih baru, atau versi citra bit fluent harus versi 1.7.2 atau versi yang lebih baru.

```
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluent-bit
  namespace: amazon-cloudwatch
  labels:
    k8s-app: fluent-bit
    version: v1
    kubernetes.io/cluster-service: "true"
spec:
  selector:
    matchLabels:
      k8s-app: fluent-bit
  template:
    metadata:
      labels:
        k8s-app: fluent-bit
        version: v1
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: fluent-bit
        image: amazon/aws-for-fluent-bit:2.19.0
        imagePullPolicy: Always
        env:
            - name: AWS_REGION
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: logs.region
            - name: CLUSTER_NAME
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: cluster.name
            - name: HTTP_SERVER
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: http.server
            - name: HTTP_PORT
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: http.port
            - name: READ_FROM_HEAD
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: read.head
            - name: READ_FROM_TAIL
              valueFrom:
                configMapKeyRef:
                  name: fluent-bit-cluster-info
                  key: read.tail
            - name: HOST_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: HOSTNAME
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: metadata.name      
            - name: CI_VERSION
              value: "k8s/1.3.8"
        resources:
            limits:
              memory: 200Mi
            requests:
              cpu: 500m
              memory: 100Mi
        volumeMounts:
        # Please don't change below read-only permissions
        - name: fluentbitstate
          mountPath: /var/fluent-bit/state
        - name: varlog
          mountPath: /var/log
          readOnly: true
        - name: varlibdockercontainers
          mountPath: /var/lib/docker/containers
          readOnly: true
        - name: fluent-bit-config
          mountPath: /fluent-bit/etc/
        - name: runlogjournal
          mountPath: /run/log/journal
          readOnly: true
        - name: dmesg
          mountPath: /var/log/dmesg
          readOnly: true
      terminationGracePeriodSeconds: 10
      hostNetwork: true
      dnsPolicy: ClusterFirstWithHostNet
      volumes:
      - name: fluentbitstate
        hostPath:
          path: /var/fluent-bit/state
      - name: varlog
        hostPath:
          path: /var/log
      - name: varlibdockercontainers
        hostPath:
          path: /var/lib/docker/containers
      - name: fluent-bit-config
        configMap:
          name: fluent-bit-config
      - name: runlogjournal
        hostPath:
          path: /run/log/journal
      - name: dmesg
        hostPath:
          path: /var/log/dmesg
      serviceAccountName: fluent-bit
      tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      - operator: "Exists"
        effect: "NoExecute"
      - operator: "Exists"
        effect: "NoSchedule"
```

Konfigurasi Plugin Kubernetes harus serupa dengan konfigurasi berikut ini:

```
[FILTER]
        Name                kubernetes
        Match               application.*
        Kube_URL            https://kubernetes.default.svc:443
        Kube_Tag_Prefix     application.var.log.containers.
        Merge_Log           On
        Merge_Log_Key       log_processed
        K8S-Logging.Parser  On
        K8S-Logging.Exclude Off
        Labels              Off
        Annotations         Off
        Use_Kubelet         On
        Kubelet_Port        10250 
        Buffer_Size         0
```