Lsyncd

What is Lsyncd?

Lsyncd is a lightweight daemon that monitors directory changes and syncs them using rsync. Originally developed to replace complex replication setups, it has been actively maintained since the late 2000s and is stable and mature. It relies on inotify to detect file changes, making it efficient and well-integrated with Linux systems.

It's best suited for system administrators and advanced users who need reliable, scriptable directory synchronization across servers or local paths. Unlike GUI-focused tools, it runs in the background and is configured via Lua scripts or simple config files, offering fine control over sync behavior.

Compared to Resilio Sync, Lsyncd lacks peer-to-peer syncing and a user-friendly interface. It doesn't sync across untrusted networks out of the box and requires SSH/rsync access. However, it's more transparent and predictable, fitting better into traditional Unix-style automation workflows.

Best for: System admins and Linux users who need automated, scriptable directory sync over SSH or local paths.

Key features of Lsyncd

• Real-time sync via inotify
• Uses rsync for efficient transfers
• Supports local and remote targets
• Configurable via Lua or shell
• Minimal resource usage
• Can run multiple instances
• Logs and error handling
• Supports SSH for secure transfers

Tips for Windows users

Unlike Resilio Sync, Lsyncd doesn't use a P2P model or sync without configuration. You'll need SSH access and rsync on both ends. Set up key-based authentication and define source and target paths in the config. It watches directories, not individual files by default, so structure matters. No sync history or cloud UI—monitor logs directly.