Casync

casync (content-addressable synchronisation) is a Linux software utility designed to distribute frequently-updated file system images over the Internet.^[2][3]

casync
Original author(s)	Lennart Poettering
Initial release	June 20, 2017; 8 years ago (2017-06-20)
Stable release	2[1]  / 26 July 2017; 8 years ago (26 July 2017)
Repository	github.com/systemd/casync/
Written in	C
Operating system	Linux
Type	Data transfer
License	LGPLv2.1
Website	github.com/systemd/casync/

Utility

According to the creator Lennart Poettering, casync is inspired by rsync and Git,^[4] as well as tar.^[5] casync is aimed to be used for Internet of things (IoT), container, virtual machine (VM), portable services, and operating system (OS) images, as well as backups and home directory synchronization.^[3] casync splits images into variable size segments, uses sha256 checksums, and aims to work with content delivery networks (CDNs).^[5][4] Available for Linux only,^[4] packages are available for Ubuntu, Fedora and Arch Linux.^[5]

Similar software

Similar software that delivers file system images are:^[4]

• Docker with a layered tarballs
• OSTree

See also

• Free and open-source software portal
• Internet portal

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