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Elasticsearch + Kibana + Fluent-bit日志采集方案

Elasticsearch + Kibana + Fluent-bit日志采集方案

序

在本文中，将简单说明如何在Kubernetes环境下部署 Elasticsearch服务、Kibana服务、Fluent Bit服务，通过Kibana服务进行可视化预览， 同时我们将以Fluent-Bit 进行日志收集。

本文所部署服务为典型的EFK日志系统，至少是这些组件。如果部署了一整套EFK系统，从中选择某个Pod的日志也需要进一步进行筛选过滤才能得到需要的日志。有时候我们不需要收集整个集群所产生的日志内容，而是只关心某个命名空间、某个模块所产生的日志，这时候就需要更为灵活的日志代理部署模式了，我们通常称之为“Sidecar”模式。基于伴生模式的日志可以很容易满足需求。

在伴生模式容器模式下，Pod内部通常有两个应用容器，一个为主业务容器，另一个为日志代理功能的伴生容器，两个容器共享一个数据卷。

所以在容器编排集群中有两种日志采集方案：

方案1：Sidecar 伴生模式
方案2：Daemonset模式

部署清单

  • Elasticsearch：6.8.16
  • Kibana: 6.8.16
  • Fluent-bit：1.7

Elasticsearch 部署

  • configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: es-config
data:
  elasticsearch.yml: |
    cluster.name: contaner-log
    network.host: 0.0.0.0
    http.port: 9200
    transport.host: 127.0.0.1
    transport.tcp.port: 9300
    bootstrap.memory_lock: false
    xpack.security.enabled: true
    xpack.monitoring.enabled: false
    xpack.graph.enabled: false
    xpack.watcher.enabled: false
    xpack.ml.enabled: false
    indices.query.bool.max_clause_count: 10240
  ES_JAVA_OPTS: -Xms2046m -Xmx4096m

留意xpack.security.enabled: true配置，我们需要启用xpack插件

  • service.yaml
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch-svc
spec:
  selector:
    app: elasticsearch
    env: prod
  ports:
  - name: http
    protocol: TCP
    port: 9200
    targetPort: 9200
  type: ClusterIP
  #clusterIP: None
  sessionAffinity: None
  • deployment.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: elasticsearch
spec:
  serviceName: elasticsearch
  selector:
    matchLabels:
      app: elasticsearch
      env: prod
  replicas: 1
  template:
    metadata:
      labels:
        app: elasticsearch
        env: prod
    spec:
      nodeSelector:
        app: logging-platform
      securityContext:
        fsGroup: 1000
      initContainers:
      - name: fix-permissions
        image: busybox:latest
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        command: ["sh", "-c", "chown -R 1000:1000 /usr/share/elasticsearch/data"]
        volumeMounts:
          - name: es-data
            mountPath: /usr/share/elasticsearch/data
      - name: init-sysctl
        image: busybox
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
      containers:
      - name: elasticsearch
        image: docker.elastic.co/elasticsearch/elasticsearch:6.8.16
        resources:
          requests:
            memory: 2Gi
        env:
        - name: discovery.type
          value: single-node
        - name: ES_JAVA_OPTS
          valueFrom:
             configMapKeyRef:
                name: es-config
                key: ES_JAVA_OPTS
        #readinessProbe:
        #  httpGet:
        #    scheme: HTTP
        #    path: /_cluster/health?local=true
        #    port: 9200
        #  initialDelaySeconds: 5
        securityContext:
          privileged: true
          runAsUser: 1000
          capabilities:
            add:
            - IPC_LOCK
            - SYS_RESOURCE
        volumeMounts:
        - name: volume-localtime
          mountPath: /etc/localtime
        - name: es-data
          mountPath: /usr/share/elasticsearch/data
        - name: es-config
          mountPath: /usr/share/elasticsearch/config/elasticsearch.yml
          subPath: elasticsearch.yml
      volumes:
      - name: volume-localtime
        hostPath:
          path: /etc/localtime
      - name: es-data
        hostPath:
          path: /opt/haid/dbs/elasticsearch
      - name: es-config
        configMap:
          name: es-config
          items:
            - key: elasticsearch.yml
              path: elasticsearch.yml

Tips： 由于开启了X-pack插件，启用探针时需要添加验证

创建KUBE资源

kubectl apply -f .

应用正常初始化后，使用以下命令来创建用户名与密码

$ kubectl exec -it elasticsearch-0  -- bin/elasticsearch-setup-passwords auto -b
<忽略其它用户名密码>

Changed password for user elastic
PASSWORD elastic = password  # 管理员账号

Kibana 部署

  • configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: kibana-config
  labels:
    component: kibana
data:
  elasticsearch_username: kibana                # 使用上面创建的kibana凭证
  elasticsearch_password: xxxxxxxxx

建议使用secret资源

  • service.yaml
apiVersion: v1
kind: Service
metadata:
  name: kibana-svc
  labels:
    app: kibana
    env: prod
spec:
  selector:
    app: kibana
    env: prod
  ports:
  - name: http
    port: 80
    targetPort: http
  • demployment.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: kibana
spec:
  serviceName: kibana
  selector:
    matchLabels:
      app: kibana
      env: prod
  replicas: 1
  template:
    metadata:
      labels:
        app: kibana
        env: prod
    spec:
      terminationGracePeriodSeconds: 30
      nodeSelector:
        app: logging-platform
      containers:
      - name: kibana
        image: docker.elastic.co/kibana/kibana:6.8.16
        env:
        - name: ELASTICSEARCH_URL
          value: http://elasticsearch-svc:9200
        - name: XPACK_SECURITY_ENABLED
          value: "true"
        - name: ELASTICSEARCH_USERNAME
          valueFrom:
            configMapKeyRef:
              name: kibana-config
              key: elasticsearch_username
        - name: ELASTICSEARCH_PASSWORD
          valueFrom:
            configMapKeyRef:
              name: kibana-config
              key: elasticsearch_password
        envFrom:
        - configMapRef:
            name: kibana-config
        ports:
        - containerPort: 5601
          name: http
        resources:
          limits:
            cpu: 1000m
          requests:
            cpu: 100m

留意我们需要启用xpack插件

Ingress

将Kibana服务通过Ingress暴露出来，供外部进行访问。

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: kibana-ingress
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    nginx.ingress.kubernetes.io/proxy-body-size: 128m
    nginx.ingress.kubernetes.io/whitelist-source-range: "白名单IP"
    nginx.ingress.kubernetes.io/proxy-buffering: "on"
    nginx.ingress.kubernetes.io/proxy-buffer-size: "8k"
spec:
  rules:
  - host: c-log.vqiu.cn
    http:
      paths:
      - path: /
        backend:
          serviceName: kibana-svc
          servicePort: 80

使用Fluent-bit收集容器日志

为什么使用Fluent-bit，Fluent-bit比Fluentd更加轻量化--占用资源更低，除插件少些（毕竟发展要晚些）。

Nginx

使用configmap配置fluent-bit

apiVersion: v1
kind: ConfigMap
metadata:
  name: fluentbit-config
  labels:
    app.kubernetes.io/name: fluentbit
data:
  fluent-bit.conf: |-
    [SERVICE]
        Parsers_File     parsers.conf
        Daemon           Off
        Log_Level        info
        HTTP_Server      off
        HTTP_Listen      0.0.0.0
        HTTP_Port        24224
    [INPUT]
        Name             tail
        Tag              nginx-access.*
        Path             /var/log/nginx/*.log
        Mem_Buf_Limit    5MB
        DB               /var/log/flt_logs.db
        Refresh_Interval 5
        Ignore_Older     10s
        Rotate_Wait      5
    [FILTER]
        Name             parser
        Match            *
        Parser           nginx
        Key_name         aux
    [FILTER]
        Name             record_modifier
        Match            *
        Key_name         message
        Record           hostname ${HOSTNAME}
        Record           namespace  mdp-system
        Record           environment prod
    [OUTPUT]
        Name             es
        Match            *
        Host             elasticsearch-svc
        Port             9200
        HTTP_User        User
        HTTP_Passwd      Password
        Logstash_Format  On
        Retry_Limit      False
        Time_Key         @timestamp
        Logstash_Prefix  nginx-access

  parsers.conf: |
    [PARSER]
        Name   nginx
        Format regex
        Regex ^(?<remote>[^ ]*) (?<host>[^ ]*) (?<user>[^ ]*) \[(?<time>[^\]]*)\] "(?<method>\S+)(?: +(?<path>[^\"]*?)(?: +\S*)?)?" (?<code>[^ ]*) (?<size>[^ ]*)(?: "(?<referer>[^\"]*)" "(?<agent>[^\"]*)")? \"-\"$
        Time_Key time
        Time_Format %d/%b/%Y:%H:%M:%S %z

Tips： 如果命名空间不在同一个， 需要留意 Host地址。

Nginx部署YAML资源

apiVersion: v1
kind: Service
metadata:
  name: nginx-log-sidecar
  labels:
    app: nginx
spec:
  ports:
  - name: http
    port: 80
    targetPort: 80
  selector:
    app: nginx
  type: ClusterIP

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-log-sidecar
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: Always
        volumeMounts:
        - mountPath: /var/log/nginx
          name: log-volume
        resources:
          requests:
            cpu: 10m
            memory: 50Mi
          limits:
            cpu: 50m
            memory: 100Mi
      - name: fluentbit-logger
        image: fluent/fluent-bit:1.7
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            cpu: 20m
            memory: 100Mi
          limits:
            cpu: 100m
            memory: 200Mi
        volumeMounts:
        - mountPath: /fluent-bit/etc
          name: config
        - mountPath: /var/log/nginx
          name: log-volume
      volumes:
      - name: config
        configMap:
          name: fluentbit-config
      - name: log-volume
        emptyDir: {}

某JAVA后端应用

后端打印的日志格式如下：

[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: auditUsingGET_4
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: createUsingPOST_136
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: deleteUsingDELETE_136
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: getUsingGET_136
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: listUsingGET_144
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: updateUsingPUT_136
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: loginUsingPOST_1
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: getMatterInfoUsingPOST_1
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: getOrganizationInfoUsingPOST_1
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: getStorageInfoUsingPOST_2
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: getStorageInfoUsingPOST_3
[2021-07-03 12:01:01] [INFO] [springfox.documentation.spring.web.readers.operation.CachingOperationNameGenerator:40] Generating unique operation named: createUsingPOST_137

根据上面的日志格式，处理的正则语句如下：

^\[(?<time>\d{4}-\d{1,2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2})\] \[(?<level>(INFO|ERROR|WARN))\] \[(?<thread>.*)\] (?<message>[\s\S].*)

可移步 https://rubular.com/r/X7BH0M4Ivm 进行测试

部署YAML资源

  • configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: webapp-fb-config
data:
  fluent-bit.conf: |-
    [SERVICE]
        Flush         1
        Log_Level     info
        Daemon        off
        Parsers_File  parsers.conf
        HTTP_Server   Off
        HTTP_Listen   0.0.0.0
        HTTP_Port     2020
    @INCLUDE input-java.conf
    #@INCLUDE filter-stdout.conf
    @INCLUDE output-stdout.conf

  input-java.conf: |-
    [INPUT]
        Name              tail
        Tag               javaLog
        Path              /tmp/log/*
        Mem_Buf_Limit     5MB
        Buffer_Chunk_Size 256KB
        Buffer_Max_Size   512KB
        Multiline         On
        Refresh_Interval  10
        #Skip_Long_Lines   On
        Parser_Firstline  java_multiline
        DB                /var/log/flb_kube.db

  filter-stdout.conf: |-
    [FILTER]
        Name             record_modifier
        Match            javaLog
        Key_name         log
        Record           hostname ${HOSTNAME}
        Record           environment dev

  output-stdout.conf: |-    
    [OUTPUT]
        Name             es
        Match            *
        Host             c-log-es-slb.xx.local
        Port             9200
        HTTP_User        User
        HTTP_Passwd      PASSWORD
        Logstash_Format  On
        Retry_Limit      False
        Time_Key         @timestamp
        Logstash_Prefix  javaLog

  parsers.conf: |-
    [PARSER]
        Name        java_multiline
        Format      regex
        Time_Key    time
        Time_Key    Time_Format %Y-%m-%d %H:%M:%S
        Regex       /^\[(?<time>\d{4}-\d{1,2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2})\] \[(?<level>(INFO|ERROR|WARN))\] \[(?<thread>.*)\] (?<message>[\s\S].*)/
  • deployment.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
  name: javeApp-deploy
  annotations:
    app.kubernetes.io/developer: "hecx02"
    app.kubernetes.io/pm: "null"
    app.kubernetes.io/ops: "qiush01"
    app.kubernetes.io/repository: "https://gitlab.xx.com/Project/javeApp.git"
    app.kubernetes.io/managed-by: jenkins
spec:
  replicas: 1
  selector:
    matchLabels:
      app: javeApp
      env: dev
  template:
    metadata:
      labels:
        app: javeApp
        env: dev
    spec:
      terminationGracePeriodSeconds: 20
      imagePullSecrets:
      - name: haid-registry-secret
      nodeSelector:
        app: javeApp
      containers:
      - name: javeApp-fb-sidecar
        image: fluent-bit:1.7
        imagePullPolicy: IfNotPresent
        name: fluentbit-sidecar
        resources:
          limits:
            cpu: 200m
            memory: 800Mi
          requests:
            cpu: 20m
            memory: 100Mi
        volumeMounts:
        - name: fluentbit-config
          mountPath: /fluent-bit/etc
        - name: log-storage
          mountPath: /tmp/log
      - name: webapp
        image: registry.xxx.com/project/javeApp:#IMAGE_TAG#
        imagePullPolicy: IfNotPresent
        ports:
        - name: http
          containerPort: 8080
          protocol: TCP
        resources:
          requests:
            cpu: 800m
            memory: "2Gi"
          limits:
            cpu: 2
            memory: "6Gi"
        livenessProbe:
          initialDelaySeconds: 120
          periodSeconds: 10
          timeoutSeconds: 5
          httpGet:
            path: /
            port: 8080
            scheme: HTTP
        readinessProbe:
          initialDelaySeconds: 120
          periodSeconds: 10
          timeoutSeconds: 5
          httpGet:
            path: /
            port: 8080
            scheme: HTTP
        volumeMounts:
        - name: config
          mountPath: /usr/local/tomcat/webapps/ROOT/WEB-INF/classes/dbconfig.properties
          subPath: dbconfig.properties
        - name: log-storage
          mountPath: /usr/local/logs
      volumes:
      - name: config
        configMap:
          name: javeApp-config
      - name: fluentbit-config
        configMap:
          name: javeApp-fb-config
      - name: log-storage
        emptyDir: {}

应用预览

Kibana登陆截图
kibana_login

Nginx日志截图
fluent-bit

常用故障

1、lines are too long. Skipping file

[xxxx/xx/xx 01:07:03] [error] [input:tail:tail.0] file=/usr/local/xx/log.txt requires a larger buffer size, lines are too long. Skipping file.
[xxxx/xx/xx 01:08:03] [error] [input:tail:tail.0] file=/usr/local/xx/log_.txt requires a larger buffer size, lines are too long. xx file.
[xxxx/xx/xx 01:09:03] [error] [input:tail:tail.0] file=/usr/local/xx/log_.txt requires a larger buffer size, lines are too long. Skipping file.

处理：
添加Buffer_Chunk_Size和Buffer_Chunk_Size，Buffer_Chunk_Size默认是32Kb，如果一行数据的长度大于这个值，可能会出现如上错误，其中Buffer_Max_Size默认情况下跟Buffer_Chunk_Size保持一致。

    [INPUT]
        Name             tail
        Mem_Buf_Limit    5MB
        Buffer_Chunk_Size 256KB
        Buffer_Max_Size   512KB

资料引用

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