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Two-way synchronization between two VPSs located in different regions

To achieve two-way synchronization between two VPSs located in different regions (UK and Germany) with Ubuntu installed, here are five top solutions you can consider:

1. Unison

  • Overview: Unison is a file synchronization tool that supports two-way syncing across different systems. It can detect changes on both sides and merge them automatically.
  • Key Features:
    • Cross-platform (runs on Linux, macOS, and Windows)
    • Handles conflicts by prompting the user or using specified rules
    • Uses SSH for secure communication
    • Suitable for real-time sync
  • Installation: Available via Ubuntu package manager (sudo apt install unison).

2. rsync with Cron

  • Overview: rsync is a powerful file-copying tool commonly used for syncing data. Though primarily used for one-way sync, you can configure cron jobs on both servers to create a two-way sync.
  • Key Features:
    • Efficient, fast, and uses delta encoding to transfer only changed parts of files
    • Secure (supports SSH)
    • Easily configurable for bi-directional sync using scripting
  • Installation: Available by default on Ubuntu.

3. Syncthing

  • Overview: Syncthing is an open-source decentralized file synchronization tool. It provides a user-friendly web interface and allows real-time syncing between multiple devices, making it ideal for two-way sync between your VPSs.
  • Key Features:
    • Decentralized, real-time sync
    • Secure and encrypted
    • No need for external servers
    • Supports file versioning
  • Installation: Available via the official repository (sudo apt install syncthing).

4. GlusterFS

  • Overview: GlusterFS is a scalable network filesystem that provides data replication across multiple servers, including two-way synchronization. It is suitable if you need a more advanced and scalable solution.
  • Key Features:
    • Scalable and distributed file system
    • Real-time replication
    • High availability and redundancy
    • Suitable for large volumes of data
  • Installation: Available via the Ubuntu repository (sudo apt install glusterfs-server).

5. Seafile

  • Overview: Seafile is a cloud-based file syncing and collaboration tool. It can be used to create a private sync server between your VPSs for two-way synchronization of data.
  • Key Features:
    • Efficient, real-time sync
    • Version control and file locking
    • Multi-platform support (Linux, macOS, Windows)
    • Web-based admin interface
  • Installation: Available as a server edition for Linux.

Summary:

  • Unison is ideal for simple, two-way file synchronization.
  • rsync with cron is a more customizable option for power users.
  • Syncthing offers a real-time decentralized sync solution with minimal setup.
  • GlusterFS is the best choice for enterprise-level, high-volume data synchronization with real-time replication.
  • Seafile is perfect for collaborative environments and real-time syncing with additional cloud-like features.

Each solution can handle different synchronization scenarios, and the best choice depends on your specific requirements (e.g., simplicity, real-time sync, scalability).

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