Casync Explained

casync (content-addressable synchronisation) is a Linux software utility designed to distribute frequently-updated file system images over the Internet.^{[1] [2]}

Utility

According to the creator Lennart Poettering, casync is inspired by rsync and Git,^[3] as well as tar.^[4] casync is aimed to be used for Internet of things (IoT), containerization, virtual machines (VMs), portable services, and operating system (OS) images, as well as backups and home directory synchronization.^[2] casync splits images into variable size segments, uses sha256 checksums, and aims to work with content delivery networks (CDNs).^{[4] [3]} Available for Linux only,^[3] packages are available for Ubuntu, Fedora and Arch Linux.^[4]

Similar software

Similar software that delivers file system images are:^[3]

• Docker with a layered tarballs
• OSTree

See also

• BitTorrent
  • Data deduplication Flatpak
• InterPlanetary File System
• SquashFS
• zsync

Notes and References

1. Web site: June 20, 2017 . The casync filesystem image distribution tool [LWN.net] ]. 2024-05-27 . lwn.net.
2. Web site: Larabel . Michael . 20 June 2017 . Lennart Poettering Announces New Project: casync - Phoronix . 2024-05-27 . Phoronix.
3. Web site: 20 June 2017 . casync — A tool for distributing file system images . 2024-05-27 . 0pointer.net.
4. Web site: 21 June 2017 . Synchronisationsprogramm casync in erster Version - Pro-Linux . 2024-05-27 . www.pro-linux.de.