Simple Log Service：Kumpulkan log teks dari pod Kubernetes (mode Sidecar)

Kurangi biaya dengan menyaring konten

{"level":"WARNING","timestamp":"2025-09-23T19:11:40+0800","cluster":"yilu-cluster-0728","message":"Disk space is running low","freeSpace":"15%"}
{"level":"ERROR","timestamp":"2025-09-23T19:11:42+0800","cluster":"yilu-cluster-0728","message":"Failed to connect to database","errorCode":5003}
{"level":"INFO","timestamp":"2025-09-23T19:11:47+0800","cluster":"yilu-cluster-0728","message":"User logged in successfully","userId":"user-123"}

{"level":"WARNING","timestamp":"2025-09-23T19:11:40+0800","cluster":"yilu-cluster-0728","message":"Disk space is running low","freeSpace":"15%"}
{"level":"ERROR","timestamp":"2025-09-23T19:11:42+0800","cluster":"yilu-cluster-0728","message":"Failed to connect to database","errorCode":5003}

Kontrol cakupan pengumpulan dengan daftar hitam

Penyaringan kontainer

Konfigurasikan topik

Ketika log dari beberapa aplikasi atau instans memiliki format yang sama tetapi path berbeda (seperti /apps/app-A/run.log dan /apps/app-B/run.log), sulit membedakan sumber log yang dikumpulkan. Hasilkan topik berdasarkan kelompok mesin, nama kustom, atau ekstraksi path file untuk secara fleksibel membedakan log dari layanan atau path yang berbeda.

Penambahan tag log

Tugas jangka pendek (Job/CronJob)

apiVersion: batch/v1
kind: Job
metadata:
  name: demo-job
spec:
  backoffLimit: 3                   
  activeDeadlineSeconds: 3600        
  completions: 1                     
  parallelism: 1                    
  
  template:
    spec:
      restartPolicy: Never         
      terminationGracePeriodSeconds: 300 
      
      containers:
        # Kontainer aplikasi
        - name: demo-job
          image: debian:bookworm-slim
          command: ["/bin/bash", "-c"]
          args:
            - |
              # Tunggu LoongCollector siap
              echo "[$(date)] Business: Waiting for LoongCollector to be ready..."
              until [[ -f /tasksite/cornerstone ]]; do 
                sleep 1
              done
              echo "[$(date)] Business: LoongCollector is ready, starting business logic"
              
              # Jalankan logika bisnis
              echo "Hello, World!" >> /app/logs/business.log
              
              # Simpan kode keluar
              retcode=$?
              echo "[$(date)] Business: Task completed with exit code: $retcode"
              
              # Beri tahu LoongCollector bahwa tugas bisnis selesai
              touch /tasksite/tombstone
              echo "[$(date)] Business: Tombstone created, exiting"
              
              exit $retcode
          
          # Batas resource
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "500"
              memory: "512Mi"
          
          # Pemasangan volume
          volumeMounts:
            - name: app-logs
              mountPath: /app/logs
            - name: tasksite
              mountPath: /tasksite


        # Kontainer Sidecar LoongCollector
        - name: loongcollector
          image: aliyun-observability-release-registry.cn-hongkong.cr.aliyuncs.com/loongcollector/loongcollector:v3.1.1.0-20fa5eb-aliyun
          command: ["/bin/bash", "-c"]
          args:
            - |
              echo "[$(date)] LoongCollector: Starting initialization"
              
              # Mulai layanan LoongCollector
              /etc/init.d/loongcollectord start
              
              # Tunggu konfigurasi diunduh dan layanan siap
              sleep 15
              
              # Verifikasi status layanan
              if /etc/init.d/loongcollectord status; then
                echo "[$(date)] LoongCollector: Service started successfully"
                touch /tasksite/cornerstone
              else
                echo "[$(date)] LoongCollector: Failed to start service"
                exit 1
              fi
              
              # Tunggu kontainer aplikasi selesai
              echo "[$(date)] LoongCollector: Waiting for business container to complete"
              until [[ -f /tasksite/tombstone ]]; do 
                sleep 2
              done
              
              echo "[$(date)] LoongCollector: Business completed, waiting for log transmission"
              # Beri waktu cukup untuk mengirimkan log yang tersisa
              sleep 30
              
              echo "[$(date)] LoongCollector: Stopping service"
              /etc/init.d/loongcollectord stop
              
              echo "[$(date)] LoongCollector: Shutdown complete"
          
          # Pemeriksaan kesehatan
          livenessProbe:
            exec:
              command: ["/etc/init.d/loongcollectord", "status"]
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          
          # Konfigurasi resource
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "500m"
              memory: "512Mi"
          
          # Konfigurasi variabel lingkungan
          env:
            - name: ALIYUN_LOGTAIL_USER_ID
              value: "your-user-id"
            - name: ALIYUN_LOGTAIL_USER_DEFINED_ID
              value: "your-user-defined-id"
            - name: ALIYUN_LOGTAIL_CONFIG
              value: "/etc/ilogtail/conf/cn-hongkong/ilogtail_config.json"
            - name: ALIYUN_LOG_ENV_TAGS
              value: "_pod_name_|_pod_ip_|_namespace_|_node_name_"
            
            # Penyuntikan informasi pod
            - name: "_pod_name_"
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: "_pod_ip_"
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: "_namespace_"
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: "_node_name_"
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          
          # Pemasangan volume
          volumeMounts:
            - name: app-logs
              mountPath: /app/logs
              readOnly: true
            - name: tasksite
              mountPath: /tasksite
            - name: tz-config
              mountPath: /etc/localtime
              readOnly: true
      
      # Definisi volume
      volumes:
        - name: app-logs
          emptyDir: {}
        - name: tasksite
          emptyDir:
            medium: Memory
            sizeLimit: "10Mi"
        - name: tz-config
          hostPath:
            path: /usr/share/zoneinfo/Asia/Shanghai

Layanan jangka panjang (Deployment/StatefulSet)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-demo
  namespace: production
  labels:
    app: nginx-demo
    version: v1.0.0
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1      
      maxSurge: 1          
  selector:
    matchLabels:
      app: nginx-demo
  template:
    metadata:
      labels:
        app: nginx-demo
        version: v1.0.0    
    spec:
      terminationGracePeriodSeconds: 600  # Periode shutdown yang mulus selama 10 menit
      
      containers:
        # Kontainer aplikasi - Aplikasi web
        - name: nginx-demo
          image: anolis-registry.cn-zhangjiakou.cr.aliyuncs.com/openanolis/nginx:1.14.1-8.6          
          # Perintah startup dan penanganan sinyal
          command: ["/bin/sh", "-c"]
          args:
            - |
              # Definisikan fungsi penanganan sinyal
              _term_handler() {
                  echo "[$(date)] [nginx-demo] Caught SIGTERM, starting graceful shutdown..."
                  
                  # Kirim sinyal QUIT ke Nginx untuk penghentian yang mulus
                  if [ -n "$NGINX_PID" ]; then
                      kill -QUIT "$NGINX_PID" 2>/dev/null || true
                      echo "[$(date)] [nginx-demo] Sent SIGQUIT to Nginx PID: $NGINX_PID"
                      
                      # Tunggu Nginx berhenti secara mulus
                      wait "$NGINX_PID"
                      EXIT_CODE=$?
                      echo "[$(date)] [nginx-demo] Nginx stopped with exit code: $EXIT_CODE"
                  fi
                  
                  # Beri tahu LoongCollector bahwa kontainer aplikasi telah berhenti
                  echo "[$(date)] [nginx-demo] Writing tombstone file"
                  touch /tasksite/tombstone
                  
                  exit $EXIT_CODE
              }
              
              # Daftarkan penanganan sinyal
              trap _term_handler SIGTERM SIGINT SIGQUIT

              # Tunggu LoongCollector siap
              echo "[$(date)] [nginx-demo]: Waiting for LoongCollector to be ready..."
              until [[ -f /tasksite/cornerstone ]]; do 
                sleep 1
              done
              echo "[$(date)] [nginx-demo]: LoongCollector is ready, starting business logic"
              
              # Mulai Nginx
              echo "[$(date)] [nginx-demo] Starting Nginx..."
              nginx -g 'daemon off;' &
              NGINX_PID=$!
              echo "[$(date)] [nginx-demo] Nginx started with PID: $NGINX_PID"
              
              # Tunggu proses Nginx
              wait $NGINX_PID
              EXIT_CODE=$?
              
              # Beri tahu LoongCollector juga jika keluar bukan karena sinyal
              if [ ! -f /tasksite/tombstone ]; then
                  echo "[$(date)] [nginx-demo] Unexpected exit, writing tombstone"
                  touch /tasksite/tombstone
              fi
              
              exit $EXIT_CODE
                    
          # Konfigurasi resource
          resources:
            requests:
              cpu: "200m"
              memory: "256Mi"
            limits:
              cpu: "1000m"
              memory: "1Gi"
          
          # Pemasangan volume
          volumeMounts:
            - name: nginx-logs
              mountPath: /var/log/nginx
            - name: tasksite
              mountPath: /tasksite
            - name: tz-config
              mountPath: /etc/localtime
              readOnly: true

        # Kontainer Sidecar LoongCollector
        - name: loongcollector
          image: aliyun-observability-release-registry.cn-shenzhen.cr.aliyuncs.com/loongcollector/loongcollector:v3.1.1.0-20fa5eb-aliyun
          command: ["/bin/bash", "-c"]
          args:
            - |
              echo "[$(date)] LoongCollector: Starting initialization"
              
              # Mulai layanan LoongCollector
              /etc/init.d/loongcollectord start
              
              # Tunggu konfigurasi diunduh dan layanan siap
              sleep 15
              
              # Verifikasi status layanan
              if /etc/init.d/loongcollectord status; then
                echo "[$(date)] LoongCollector: Service started successfully"
                touch /tasksite/cornerstone
              else
                echo "[$(date)] LoongCollector: Failed to start service"
                exit 1
              fi
              
              # Tunggu kontainer aplikasi selesai
              echo "[$(date)] LoongCollector: Waiting for business container to complete"
              until [[ -f /tasksite/tombstone ]]; do 
                sleep 2
              done
              
              echo "[$(date)] LoongCollector: Business completed, waiting for log transmission"
              # Beri waktu cukup untuk mengirimkan log yang tersisa
              sleep 30
              
              echo "[$(date)] LoongCollector: Stopping service"
              /etc/init.d/loongcollectord stop
              
              echo "[$(date)] LoongCollector: Shutdown complete"
          
          # Pemeriksaan kesehatan
          livenessProbe:
            exec:
              command: ["/etc/init.d/loongcollectord", "status"]
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          # Konfigurasi resource
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "2000m"
              memory: "2048Mi"
          
          # Konfigurasi variabel lingkungan
          env:
            - name: ALIYUN_LOGTAIL_USER_ID
              value: "${your_aliyun_user_id}"
            - name: ALIYUN_LOGTAIL_USER_DEFINED_ID
              value: "${your_machine_group_user_defined_id}"
            - name: ALIYUN_LOGTAIL_CONFIG
              value: "/etc/ilogtail/conf/${your_region_config}/ilogtail_config.json"
            
            # Aktifkan mode full drain untuk memastikan semua log dikirim saat pod berhenti
            - name: enable_full_drain_mode
              value: "true"
            
            # Tambahkan informasi lingkungan pod sebagai tag log
            - name: "ALIYUN_LOG_ENV_TAGS"
              value: "_pod_name_|_pod_ip_|_namespace_|_node_name_|_node_ip_"
            # Dapatkan informasi pod dan node
            - name: "_pod_name_"
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: "_pod_ip_"
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: "_namespace_"
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: "_node_name_"
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: "_node_ip_"
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
          
          # Pemasangan volume
          volumeMounts:
            - name: nginx-logs
              mountPath: /var/log/nginx
              readOnly: true
            - name: tasksite
              mountPath: /tasksite
            - name: tz-config
              mountPath: /etc/localtime
              readOnly: true
      
      # Definisi volume
      volumes:
        - name: nginx-logs
          emptyDir: {}
        - name: tasksite
          emptyDir:
            medium: Memory
            sizeLimit: "50Mi"
        - name: tz-config
          hostPath:
            path: /usr/share/zoneinfo/Asia/Shanghai