casync

{{Infobox software

| name = casync

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| author = Lennart Poettering

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| released = {{Start date and age|2017|06|20}}

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| latest release version = {{wikidata|property|edit|reference|P348}}

| latest release date = {{start date and age|{{wikidata|qualifier|P348|P577}}}}

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| repo = {{URL|https://github.com/systemd/casync/}}

| programming language = C

| operating system = Linux

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| genre = Data transfer

| license = LGPLv2.1

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casync (content-addressable synchronisation) is a Linux software utility designed to distribute frequently-updated file system images over the Internet.{{cite web |date=June 20, 2017 |title=The casync filesystem image distribution tool [LWN.net] |url=https://lwn.net/Articles/726005/ |access-date=2024-05-27 |website=lwn.net}}{{cite web |last=Larabel |first=Michael |date=20 June 2017 |title=Lennart Poettering Announces New Project: casync - Phoronix |url=https://www.phoronix.com/scan.php?page=news_item&px=Lennart-casync |access-date=2024-05-27 |website=Phoronix}}

Utility

According to the creator Lennart Poettering, casync is inspired by rsync and Git,{{cite web |date=20 June 2017 |title=casync — A tool for distributing file system images |url=http://0pointer.net/blog/casync-a-tool-for-distributing-file-system-images.html |access-date=2024-05-27 |website=0pointer.net}} as well as tar.{{cite web |date=21 June 2017 |title=Synchronisationsprogramm casync in erster Version - Pro-Linux |url=http://www.pro-linux.de/news/1/24861/synchronisationsprogramm-casync-in-erster-version.html |access-date=2024-05-27 |publisher=www.pro-linux.de}} 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. casync splits images into variable size segments, uses sha256 checksums, and aims to work with content delivery networks (CDNs). Available for Linux only, packages are available for Ubuntu, Fedora and Arch Linux.