K8S学习笔记之filebeat采集K8S微服务java堆栈多行日志

0x00 背景

K8S内运行Spring Cloud微服务，根据定制容器架构要求log文件不落地，log全部输出到std管道，由基于docker的filebeat去管道采集，然后发往Kafka或者ES集群。

0x01 多行匹配和yaml文件

在filebeat启动的yaml文件内，指定相应的名称空间并配置java堆栈的多行解析规则，如下yaml文件输出端是kafka，如需要输出到es集群，可更改对应配置

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/v1beta1
kind: ClusterRole
metadata:
  name: filebeat
  namespace: logging
  labels:
    k8s-app: filebeat
rules:
- apiGroups: [""]
  resources:
  - namespaces
  - pods
  verbs:
  - get
  - watch
  - list
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: filebeat
  namespace: logging
subjects:
- kind: ServiceAccount
  name: filebeat
  namespace: logging
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.config:
    #  inputs:
    #    path: ${path.config}/inputs.d/*.yml
    #    reload.enabled: true
      modules:
        path: ${path.config}/modules.d/*.yml
        reload.enabled: true

    filebeat.autodiscover:
      providers:
        - type: kubernetes
          hints.enabled: true
          templates:
            - condition:
                equals:
                  # java堆栈对行日志出现的名称空间为wfw
                  kubernetes.namespace: wfw 
              config:
                - type: docker
                  containers.ids:
                    - "${data.kubernetes.container.id}"
                  # 配置java堆栈多行匹配规则
                  multiline: 
                    pattern: '^[[:space:]]+(at|\.{3}\b|^Caused by:)' 
                    negate: false
                    match: after
            - condition:
                equals:
                  kubernetes.namespace: kube-system
              config:
                - type: docker
                  containers.ids:
                    - "${data.kubernetes.container.id}"
    # 输出数据到kafka               
    output.kafka:
      enable: true
      hosts: ["xx.xx.xx.xx:9092","xx.xx.xx.xx:9092","xx.xx.xx.xx:9092"]
      topic: k8s_log
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: filebeat-inputs
  namespace: logging
  labels:
    k8s-app: filebeat
    kubernetes.io/cluster-service: "true"
data:
  kubernetes.yml: |-
    - type: docker
      containers.ids:
      - "*"
      processors:
        - add_kubernetes_metadata:
            in_cluster: true
      multiline:
        pattern: '^[A-Za-z ]+[0-9]{2} (?:[01]d|2[0123]):(?:[012345]d):(?:[012345]d)'
        negate: true
        match: after
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: filebeat
  namespace: logging
  labels:
    k8s-app: filebeat
spec:
  template:
    metadata:
      labels:
        k8s-app: filebeat
    spec:
      serviceAccountName: filebeat
      terminationGracePeriodSeconds: 30
      containers:
      - name: filebeat
        image: 10.131.141.200/public/filebeat:6.5.4
        args: [
          "-c", "/usr/share/filebeat/filebeat.yml",
          "-e",
        ]
        securityContext:
          runAsUser: 0
          # If using Red Hat OpenShift uncomment this:
          #privileged: true
        resources:
          limits:
            cpu: 100m
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 200Mi
        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
      volumes:
      - name: config
        configMap:
          defaultMode: 0600
          name: filebeat-config
      - name: varlibdockercontainers
        hostPath:
          path: /var/lib/docker/containers
      - name: inputs
        configMap:
          defaultMode: 0600
          name: filebeat-inputs
      # 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:
          path: /var/lib/filebeat-data
          type: DirectoryOrCreate
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: filebeat
  namespace: logging
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: filebeat
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: filebeat
  namespace: logging

0x02 结论

参考1 https://www.elastic.co/guide/en/beats/filebeat/6.7/_examples_of_multiline_configuration.html

参考2 https://stackoverflow.com/questions/50931623/multi-line-logs-into-es-from-filebeat-deployed-as-kubernetes-daemonset

多使用StackOverflow和Google，技术问题少问百度。