File Rotation

Log files are rotated automatically to prevent uncontrolled file growth and to keep log archives organized and manageable in long-running applications.

Rotation

Rotation is controlled through:

• MaxFileSize
• daily file naming

Example configuration:

package main

import (
	"log/slog"

	"github.com/netlifeguru/logger"
)

func main() {
	closer, err := logger.Init(logger.Config{
		Dir:         "./logs",
		MaxFileSize: 10 * 1024 * 1024, // 10MB
	})

	if err != nil {
		slog.Error(err.Error())
	}

	defer closer.Close()

	slog.Info("logger started")
}

Generated files

Example output:

logs/
├── 2026-05-11-0001.log
├── 2026-05-11-0002.log
└── 2026-05-12-0001.log

Rotation occurs when:

• the current file exceeds the configured size limit
• the current date changes

This provides:

• predictable file sizes
• easier log archival
• simpler debugging by date
• improved compatibility with log collection systems

The default maximum file size is 10MB

File rotation is performed automatically during writes without requiring manual maintenance or application restarts.