K8S中如何使用sidecar模式统一收集应用日志（适用所有技术语言体系）

---apiVersion: v1kind: Servicemetadata:  name: test-app  labels:    app: test-appspec:  selector:    app: test-app  ports:  - protocol: TCP    port: 8080    targetPort: 8080    name: test-port#定义日志收集相关配置的一个configmap---apiVersion: v1kind: ConfigMapmetadata:  name: test-filebeat-config  labels:    k8s-app: filebeatdata:  filebeat.yml: |-    filebeat.prospectors:    - type: log      paths:        - /logdata/*.log      tail_files: true      fields:        pod_name: '${pod_name}'        POD_IP: '${POD_IP}'    setup.template.name: "app-logs"    setup.template.pattern: "app-logs-*"    output.elasticsearch: # 日志输出到ES      hosts: ["192.168.1.xx:9200","192.168.1.xxx:9200"]      index: "app-logs-%{+yyyy.MM}"# deployment, 也可通过daemonset方式---apiVersion: apps/v1kind: Deploymentmetadata:  name: test-appspec:  replicas: 1  minReadySeconds: 15     #滚动升级15s后标志pod准备就绪  strategy:    rollingUpdate:        #replicas为2, 升级过程中pod个数在1-3个之间      maxSurge: 1         #滚动升级时会先启动1个pod      maxUnavailable: 1   #滚动升级时允许pod处于Unavailable的最大个数  selector:    matchLabels:      app: test-app  template:    metadata:      labels:        app: test-app    spec:      terminationGracePeriodSeconds: 30 #30秒内优雅关闭程序      containers:      - image: hub.exmaple.com/publib/filebeat:6.1.3     #提前下载下来到私有镜像库的镜像(官方的可能会被墙)        name: filebeat        args: [          "-c", "/opt/filebeat/filebeat.yml",          "-e",        ]        env:        - name: POD_IP          valueFrom:            fieldRef:              apiVersion: v1              fieldPath: status.podIP        - name: pod_name          valueFrom:            fieldRef:              apiVersion: v1              fieldPath: metadata.name        securityContext:          runAsUser: 0        resources:          limits:            memory: 200Mi          requests:            cpu: 200m            memory: 200Mi        volumeMounts:        - name: config               #将configmap的内容放到容器本地目录          mountPath: /opt/filebeat/        - name: data          mountPath: /usr/share/filebeat/data        - name: logdata       #同一个pod内的两个应用共享目录logdata, 一个写一个读          mountPath: /logdata      - name: test-app        image: hub.example.com/service/test-service:latest  #提供具体服务的app镜像        ports:        - containerPort: 8080        volumeMounts:        - name: logdata       #指定挂在目录到logdata          mountPath: /usr/local/tomcat/logs      volumes:      - name: data        emptyDir: {}      - name: logdata         #定义logdata为EmptyDir类型挂载目录        emptyDir: {}      - name: config        configMap:          name: test-filebeat-config  #使用前面定义的configmap          items:          - key: filebeat.yml            path: filebeat.yml

kubectl logs -f  filebeatkubectl logs -f  test-app