实现原理

基于k8s的日志收集主要有两种方案，一是使用daemoset，另一种是基于sidecar。两种方式各有优缺点，目前DHorse是基于daemoset实现的。如图1所示：

图1

在每个k8s集群中启动一个daemoset组件，即Filebeat的服务，监控/var/log/containers目录下的日志文件变动，然后把日志内容推送到ELK集群。

DHorse日志配置

在DHorse的安装目录conf子目录下，可以通过filebeat-k8s.yml文件进行日志收集的相关配置，如下：

---

apiVersion: v1

kind: ConfigMap

metadata:

  # 默认名称，不允许修改

  name: filebeat-config

  # 默认命名空间，不允许修改

  namespace: dhorse-system

  labels:

    # 默认标签名，不允许修改

    app: filebeat

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/"

    # To enable hints based autodiscover, remove `filebeat.inputs` configuration and uncomment this:

    #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:

    cloud.id: ${ELASTIC_CLOUD_ID}

    cloud.auth: ${ELASTIC_CLOUD_AUTH}

    output.elasticsearch:

      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']

      username: ${ELASTICSEARCH_USERNAME}

      password: ${ELASTICSEARCH_PASSWORD}

---

apiVersion: apps/v1

kind: DaemonSet

metadata:

  # 默认名称，不允许修改

  name: filebeat

  # 默认命名空间，不允许修改

  namespace: dhorse-system

  labels:

    # 默认标签名，不允许修改

    app: filebeat

spec:

  selector:

    matchLabels:

      # 默认标签名，不允许修改

      app: filebeat

  template:

    metadata:

      labels:

        # 默认标签名，不允许修改

        app: filebeat

    spec:

      terminationGracePeriodSeconds: 30

      hostNetwork: true

      dnsPolicy: ClusterFirstWithHostNet

      containers:

      - name: filebeat

        # 替换成你自己的filebeat镜像

        image: docker.elastic.co/beats/filebeat:8.1.0

        args: [

          "-c", "/etc/filebeat.yml",

          "-e",

        ]

        #替换成你自己的es地址和账号

        env:

        - name: ELASTICSEARCH_HOST

          value: 127.0.0.1

        - name: ELASTICSEARCH_PORT

          value: "9200"

        - name: ELASTICSEARCH_USERNAME

          value: elastic

        - name: ELASTICSEARCH_PASSWORD

          value: changeme

        - name: ELASTIC_CLOUD_ID

          value:

        - name: ELASTIC_CLOUD_AUTH

          value:

        - name: NODE_NAME

          valueFrom:

            fieldRef:

              fieldPath: spec.nodeName

        securityContext:

          runAsUser: 0

          # If using Red Hat OpenShift uncomment this:

          #privileged: true

        resources:

          limits:

            memory: 200Mi

          requests:

            cpu: 100m

            memory: 100Mi

        volumeMounts:

        - name: config

          mountPath: /etc/filebeat.yml

          readOnly: true

          subPath: filebeat.yml

        - name: data

          mountPath: /usr/share/filebeat/data

        - name: varlibdockercontainers

          mountPath: /var/lib/docker/containers

          readOnly: true

        - name: varlog

          mountPath: /var/log

          readOnly: true

        - name: hosttime

          mountPath: /etc/localtime

          readOnly: true

      volumes:

      - name: config

        configMap:

          defaultMode: 0640

          name: filebeat-config

      - name: varlibdockercontainers

        hostPath:

          path: /var/lib/docker/containers

      - name: varlog

        hostPath:

          path: /var/log

      - name: hosttime

        hostPath:

          path: /etc/localtime

      # data folder stores a registry of read status for all files, so we don't send everything again on a Filebeat pod restart

      - name: data

        hostPath:

          # When filebeat runs as non-root user, this directory needs to be writable by group (g+w).

          path: /var/lib/filebeat-data

          type: DirectoryOrCreate

然后，需要开启目标集群的日志开关即可，如图2所示：

图2

巴特西

DHorse日志收集原理

实现原理

DHorse日志配置

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