feat: ELK Stack 통합 - Filebeat 기반 로그 수집 및 Kibana 시각화

.gitignore

@@ -43,3 +43,6 @@ out/
 # Kotlin Daemon logs
 buildSrc/.kotlin/errors/
 
+### Application Logs ###
+logs/
+

build-logic/src/main/kotlin/transentia/SpringBootAppConventionPlugin.kt

@@ -48,6 +48,9 @@ class SpringBootAppConventionPlugin : Plugin<Project> {
             add("implementation", "io.micrometer:micrometer-registry-prometheus")
             add("implementation", "io.micrometer:micrometer-tracing-bridge-otel")
 
+            // JSON 로깅 (ELK 연동)
+            add("implementation", "net.logstash.logback:logstash-logback-encoder:7.4")
+
             add("testImplementation", "org.springframework.boot:spring-boot-starter-test")
         }
 

docker-compose.yml

@@ -72,9 +72,12 @@ services:
     environment:
       KAFKA_CLUSTERS_0_NAME: local
       KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS: kafka:9092
+      KAFKA_CLUSTERS_0_SCHEMAREGISTRY: http://schema-registry:8081
     depends_on:
       kafka:
         condition: service_healthy
+      schema-registry:
+        condition: service_started
 
   schema-registry:
     image: confluentinc/cp-schema-registry:7.6.0
@@ -121,11 +124,55 @@ services:
     depends_on:
       - prometheus
 
+  elasticsearch:
+    image: docker.elastic.co/elasticsearch/elasticsearch:8.11.0
+    container_name: transfer-elasticsearch
+    restart: unless-stopped
+    ports:
+      - "9200:9200"
+    environment:
+      - discovery.type=single-node
+      - xpack.security.enabled=false
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+    volumes:
+      - es_data:/usr/share/elasticsearch/data
+    healthcheck:
+      test: ["CMD-SHELL", "curl -s http://localhost:9200/_cluster/health | grep -q status"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+
+  kibana:
+    image: docker.elastic.co/kibana/kibana:8.11.0
+    container_name: transfer-kibana
+    restart: unless-stopped
+    ports:
+      - "5601:5601"
+    environment:
+      - ELASTICSEARCH_HOSTS=http://elasticsearch:9200
+    depends_on:
+      elasticsearch:
+        condition: service_healthy
+
+  filebeat:
+    image: docker.elastic.co/beats/filebeat:8.11.0
+    container_name: transfer-filebeat
+    restart: unless-stopped
+    user: root
+    volumes:
+      - ./monitoring/filebeat.yml:/usr/share/filebeat/filebeat.yml:ro
+      - ./logs:/var/log/apps:ro
+    depends_on:
+      elasticsearch:
+        condition: service_healthy
+    command: filebeat -e -strict.perms=false
+
 volumes:
   pg_data:
   kafka_data:
   prometheus_data:
   grafana_data:
+  es_data:
 
 networks:
   default: