feat: add configurable log rotation settings via environment variables

• Add LOG_DIR env var for log file location
• Add LOG_MAX_BYTES for max log file size
• Add LOG_BACKUP_COUNT for backup count

.env.example

@@ -23,6 +23,9 @@
 ### Logging level
 # LOG_LEVEL=INFO
 # VERBOSE=False
+# LOG_DIR=/path/to/log/directory  # Log file directory path, defaults to current working directory
+# LOG_MAX_BYTES=10485760          # Log file max size in bytes, defaults to 10MB
+# LOG_BACKUP_COUNT=5              # Number of backup files to keep, defaults to 5
 
 ### Max async calls for LLM
 # MAX_ASYNC=4

gunicorn_config.py

@@ -4,8 +4,13 @@ import logging
 from lightrag.kg.shared_storage import finalize_share_data
 from lightrag.api.lightrag_server import LightragPathFilter
 
-# 获取日志文件路径
-log_file_path = os.path.abspath(os.path.join(os.getcwd(), "lightrag.log"))
+# Get log directory path from environment variable
+log_dir = os.getenv("LOG_DIR", os.getcwd())
+log_file_path = os.path.abspath(os.path.join(log_dir, "lightrag.log"))
+
+# Get log file max size and backup count from environment variables
+log_max_bytes = int(os.getenv("LOG_MAX_BYTES", 10485760))  # Default 10MB
+log_backup_count = int(os.getenv("LOG_BACKUP_COUNT", 5))  # Default 5 backups
 
 # These variables will be set by run_with_gunicorn.py
 workers = None
@@ -25,8 +30,8 @@ timeout = int(os.getenv("TIMEOUT", 120))
 keepalive = 5
 
 # Logging configuration
-errorlog = os.getenv("ERROR_LOG", log_file_path)  # 默认写入到 lightrag.log
-accesslog = os.getenv("ACCESS_LOG", log_file_path)  # 默认写入到 lightrag.log
+errorlog = os.getenv("ERROR_LOG", log_file_path)  # Default write to lightrag.log
+accesslog = os.getenv("ACCESS_LOG", log_file_path)  # Default write to lightrag.log
 
 logconfig_dict = {
     "version": 1,
@@ -44,8 +49,8 @@ logconfig_dict = {
             "class": "logging.handlers.RotatingFileHandler",
             "formatter": "standard",
             "filename": log_file_path,
-            "maxBytes": 10485760,  # 10MB
-            "backupCount": 5,
+            "maxBytes": log_max_bytes,
+            "backupCount": log_backup_count,
             "encoding": "utf8",
         },
     },

lightrag/api/lightrag_server.py

@@ -430,8 +430,13 @@ def configure_logging():
         logger.handlers = []
         logger.filters = []
 
-    # Configure basic logging
-    log_file_path = os.path.abspath(os.path.join(os.getcwd(), "lightrag.log"))
+    # Get log directory path from environment variable
+    log_dir = os.getenv("LOG_DIR", os.getcwd())
+    log_file_path = os.path.abspath(os.path.join(log_dir, "lightrag.log"))
+
+    # Get log file max size and backup count from environment variables
+    log_max_bytes = int(os.getenv("LOG_MAX_BYTES", 10485760))  # Default 10MB
+    log_backup_count = int(os.getenv("LOG_BACKUP_COUNT", 5))  # Default 5 backups
 
     logging.config.dictConfig(
         {
@@ -455,8 +460,8 @@ def configure_logging():
                     "formatter": "detailed",
                     "class": "logging.handlers.RotatingFileHandler",
                     "filename": log_file_path,
-                    "maxBytes": 10 * 1024 * 1024,  # 10MB
-                    "backupCount": 5,
+                    "maxBytes": log_max_bytes,
+                    "backupCount": log_backup_count,
                     "encoding": "utf-8",
                 },
             },