版本：v1.4

使用 Filebeat 来收集 Karmada 成员集群的日志

Filebeat 是一个轻量级的运送器，用于转发和集中日志数据。作为代理安装在你的服务器上，Filebeat 监控你指定的日志文件或位置，收集日志事件，并将它们转发到 Elasticsearch 或 kafka 以进行索引。

本文演示了如何使用 Filebeat 来收集 Karmada 成员集群的日志。

启动 Karmada 集群

你只需要克隆 Karmada repo，并在 Karmada 目录下运行以下脚本。

hack/local-up-karmada.sh

启动Filebeat

创建 Filebeat 的资源对象，内容如下，你可以在 filebeat.yml 中的 filebeat.inputs 部分指定一个输入列表。输入指定了 Filebeat 如何定位和处理输入数据，同时你也可以通过在 filebeat.yml 配置文件的 Outputs 部分设置选项来配置 Filebeat 写到一个特定的输出。这个例子将收集每个容器的日志信息，并将收集到的日志写到一个文件中。关于输入和输出配置的更多详细信息，请参考：https://github.com/elastic/beats/tree/master/filebeat/docs

apiVersion: v1
kind: Namespace
metadata:
  name: logging
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: filebeat
  namespace: logging
  labels:
    k8s-app: filebeat
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: filebeat
rules:
- apiGroups: [""] # "" indicates the core API group
  resources:
  - namespaces
  - pods
  verbs:
  - get
  - watch
  - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: filebeat
subjects:
- kind: ServiceAccount
  name: filebeat
  namespace: kube-system
roleRef:
  kind: ClusterRole
  name: filebeat
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: filebeat-config
  namespace: logging
  labels:
    k8s-app: filebeat
    kubernetes.io/cluster-service: "true"
data:
  filebeat.yml: |-
    filebeat.inputs:
    - type: container
      paths:
        - /var/log/containers/*.log
      processors:
        - add_kubernetes_metadata:
            host: ${NODE_NAME}
            matchers:
            - logs_path:
                logs_path: "/var/log/containers/"
    # 要启用基于提示的自动发现功能，请删除 `filebeat.inputs` 配置，并取消注释。
    #filebeat.autodiscover:
    #  providers:
    #    - type: kubernetes
    #      node: ${NODE_NAME}
    #      hints.enabled: true
    #      hints.default_config:
    #        type: container
    #        paths:
    #          - /var/log/containers/*${data.kubernetes.container.id}.log

    processors:
      - add_cloud_metadata:
      - add_host_metadata:

    #output.elasticsearch:
    #  hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
    #  username: ${ELASTICSEARCH_USERNAME}
    #  password: ${ELASTICSEARCH_PASSWORD}
    output.file:
        path: "/tmp/filebeat"
        filename: filebeat
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: filebeat
  namespace: logging
  labels:
    k8s-app: filebeat
spec:
  selector:
    matchLabels:
      k8s-app: filebeat
  template:
    metadata:
      labels:
        k8s-app: filebeat
    spec:
      serviceAccountName: filebeat
      terminationGracePeriodSeconds: 30
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/master
      containers:
      - name: filebeat
        image: docker.elastic.co/beats/filebeat:8.0.0-beta1-amd64
        imagePullPolicy: IfNotPresent
        args: [  "-c", "/usr/share/filebeat/filebeat.yml",  "-e",]
        env:
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        securityContext:
          runAsUser: 0
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 100Mi
        volumeMounts:
        - name: config
          mountPath: /usr/share/filebeat/filebeat.yml
          readOnly: true
          subPath: filebeat.yml
        - name: inputs
          mountPath: /usr/share/filebeat/inputs.d
          readOnly: true
        - name: data
          mountPath: /usr/share/filebeat/data
        - name: varlibdockercontainers
          mountPath: /var/lib/docker/containers
          readOnly: true
        - name: varlog
          mountPath: /var/log
          readOnly: true
      volumes:
      - name: config
        configMap:
          defaultMode: 0600
          name: filebeat-config
      - name: varlibdockercontainers
        hostPath:
          path: /var/lib/docker/containers
      - name: varlog
        hostPath:
          path: /var/log
      - name: inputs
        configMap:
          defaultMode: 0600
          name: filebeat-config
      # data 文件夹存储了所有文件的读取状态的注册表，所以我们不会在 Filebeat pod 重启时再次发送所有文件。
      - name: data
        hostPath:
          path: /var/lib/filebeat-data
          type: DirectoryOrCreate

运行下面的命令来执行 Karmada PropagationPolicy 和 ClusterPropagationPolicy。

cat <<EOF | kubectl apply -f -
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
  name: filebeat-propagation
  namespace: logging
spec:
  resourceSelectors:
    - apiVersion: v1
      kind: Namespace
      name: logging
    - apiVersion: v1
      kind: ServiceAccount
      name: filebeat
      namespace: logging
    - apiVersion: v1
      kind: ConfigMap
      name: filebeat-config
      namespace: logging
    - apiVersion: apps/v1
      kind: DaemonSet
      name: filebeat
      namespace: logging
  placement:
    clusterAffinity:
      clusterNames:
        - member1
        - member2
        - member3
EOF
cat <<EOF | kubectl apply -f -
apiVersion: policy.karmada.io/v1alpha1
kind: ClusterPropagationPolicy
metadata:
  name: filebeatsrbac-propagation
spec:
  resourceSelectors:
    - apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRole
      name: filebeat
    - apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRoleBinding
      name: filebeat
  placement:
    clusterAffinity:
      clusterNames:
      - member1
      - member2
      - member3
EOF

根据 filebeat.yml 的 output 配置，获取收集的日志。

启动 Karmada 集群​

启动Filebeat​

参考资料​

启动 Karmada 集群

启动Filebeat

参考资料