feat(docker): add dedicated PostgreSQL instance for logs

Add separate log-postgres service to docker-compose stack for storing
API logs independently from the main database.

- Add log-postgres service with PostgreSQL 15 Alpine image
- Configure environment variables for log database credentials
- Update ez-api service to depend on log-postgres health check
- Set default EZ_LOG_PG_DSN to connect to the new log database
- Update .env.example and README with new configuration options

.env.example

@@ -12,6 +12,11 @@ EZ_LOG_RETENTION_DAYS=30
 EZ_LOG_MAX_RECORDS=1000000
 EZ_LOG_PARTITIONING=off
 
+# Log DB (docker-compose log-postgres)
+LOG_POSTGRES_USER=postgres
+LOG_POSTGRES_PASSWORD=postgres
+LOG_POSTGRES_DB=ezapi_logs
+
 # Data Plane
 EZ_BALANCER_PORT=8081
 EZ_BALANCER_LOG_SINK_ENABLED=false

README.md

@@ -111,7 +111,7 @@ go run cmd/server/main.go
 
 ### Docker Compose（推荐）
 
-在 `ez-api` 目录使用自带的 `docker-compose.yml` 拉起完整栈（Postgres + Redis + ez-api + balancer）：
+在 `ez-api` 目录使用自带的 `docker-compose.yml` 拉起完整栈（Postgres + 日志库 + Redis + ez-api + balancer）：
 
 ```bash
 cd ez-api
@@ -123,6 +123,9 @@ docker compose up -d
 ```env
 EZ_ADMIN_TOKEN=admin123
 EZ_INTERNAL_STATS_TOKEN=internal123
+LOG_POSTGRES_USER=postgres
+LOG_POSTGRES_PASSWORD=postgres
+LOG_POSTGRES_DB=ezapi_logs
 EZ_BALANCER_LOG_SINK_ENABLED=false
 EZ_BALANCER_LOG_SINK_BASE_URL=http://ez-api:8080
 EZ_BALANCER_STATS_FLUSH_ENABLED=false

docker-compose.yml

@@ -21,6 +21,26 @@ services:
     networks:
       - ez-network
 
+  # 1.1 Log PostgreSQL Database
+  log-postgres:
+    image: postgres:15-alpine
+    container_name: ez-log-postgres
+    environment:
+      POSTGRES_USER: ${LOG_POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${LOG_POSTGRES_PASSWORD:-postgres}
+      POSTGRES_DB: ${LOG_POSTGRES_DB:-ezapi_logs}
+    ports:
+      - "5435:5432"
+    volumes:
+      - log_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - ez-network
+
   # 2. Redis Cache
   redis:
     image: redis:7-alpine
@@ -49,7 +69,7 @@ services:
     environment:
       EZ_API_PORT: ${EZ_API_PORT:-8080}
       EZ_PG_DSN: ${EZ_PG_DSN:-host=postgres user=postgres password=postgres dbname=ezapi port=5432 sslmode=disable}
-      EZ_LOG_PG_DSN: ${EZ_LOG_PG_DSN:-}
+      EZ_LOG_PG_DSN: ${EZ_LOG_PG_DSN:-host=log-postgres user=postgres password=postgres dbname=ezapi_logs port=5432 sslmode=disable}
       EZ_REDIS_ADDR: ${EZ_REDIS_ADDR:-redis:6379}
       EZ_REDIS_PASSWORD: ${EZ_REDIS_PASSWORD}
       EZ_REDIS_DB: ${EZ_REDIS_DB:-0}
@@ -62,6 +82,8 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
+      log-postgres:
+        condition: service_healthy
       redis:
         condition: service_healthy
     networks:
@@ -97,6 +119,7 @@ services:
 
 volumes:
   postgres_data:
+  log_postgres_data:
   redis_data:
 
 networks: