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</div> </div> </div> <div class="jumpstart-ui--two-column flex-container centered-container"> <div class="left-region flex-lg-3-of-12"> <div class="menu-block main block block-menu navigation menu--main"> <h2 aria-hidden="true" class="visually-hidden" id="menu-blockmain-menu">Main navigation</h2> <a href="#main-content" class="visually-hidden focusable su-skipnav su-skipnav--content">Skip Secondary Navigation</a> <nav class="su-multi-menu--dropdowns su-secondary-nav--light su-secondary-nav su-secondary-nav--static no-js" aria-label="secondary menu"> <div id="secondary-navigation" tabindex="-1" class="visually-hidden focusable">Secondary Navigation</div> <ul class="su-secondary-nav__menu su-secondary-nav__menu-lv1"><li class="su-secondary-nav__item"><a class="su-secondary-nav__link" href="/use-lockss/how-lockss-works"> How LOCKSS Works </a></li><li class="su-secondary-nav__item su-secondary-nav__item--active-trail su-secondary-nav__item--current"><a aria-current="true" class="su-secondary-nav__link" href="/about/software"> Software </a></li><li class="su-secondary-nav__item"><a class="su-secondary-nav__link" href="/use-lockss/support"> Support </a></li><li class="su-secondary-nav__item"><a class="su-secondary-nav__link" href="/use-lockss/post-cancellation-and-perpetual-access"> Post-Cancellation and Perpetual Access </a></li><li class="su-secondary-nav__item"><a class="su-secondary-nav__link" href="/use-lockss/publishers"> For Publishers </a></li><li class="su-secondary-nav__item"><a class="su-secondary-nav__link" href="/use-lockss/industry-standards"> Industry Standards </a></li></ul></nav> </div> </div> <div class="flex-lg-9-of-12 main-region"> <div class="jumpstart-ui-skipnav-main-anchor block-jumpstart-ui"> <div id="main-content" tabindex="-1" class="visually-hidden focusable">Main content start</div> </div> <div class="field-block node-stanford-page-su-page-components block-layout-builder"> <div class="node stanford-page su-page-components entity-reference-revisions label-hidden"> <div class="paragraph-item ptype-stanford-layout"> <div class="ptype-stanford-layout paragraph paragraph--type--stanford-layout paragraph--view-mode--default"> <div class="layout layout--layout-paragraphs-one-column"> <div class="layout__region layout__region--main"> <div class="ptype-stanford-wysiwyg paragraph paragraph--type--stanford-wysiwyg paragraph--view-mode--default"> <div class="su-wysiwyg-text paragraph stanford-wysiwyg text-long label-hidden"><p class="su-intro-text">The LOCKSS Program engineers and maintains open-source software for distributed digital preservation. We have been serving libraries and memory organizations for over two decades.</p><h2>LOCKSS 1.x</h2><p class="plain-text">The classic LOCKSS system (version 1.x) is a mature, vertically-integrated, open-source, distributed digital preservation system developed and maintained by the LOCKSS Program.</p><p class="plain-text">LOCKSS 1.x is a Java application for flavors of Linux in the RHEL family, like Rocky Linux, AlmaLinux or CentOS.</p><p class="plain-text">The classic LOCKSS system stores preserved content in a POSIX file system, harvests content from the Web with the LOCKSS Crawler, extracts bibliographic metadata from preserved content, and facilitates access to preserved content through a proxy, an OpenURL resolver, and the LOCKSS ServeContent Web replay engine. The system's Web crawling and metadata extraction activities are driven by LOCKSS plugins, and the stored content is preserved by the LOCKSS Poller's state-of-the-art implementation of the LOCKSS polling and repair protocol. The metadata extraction subsystem requires an external PostgreSQL database.</p><p class="plain-text">The latest release of the classic LOCKSS system is <a href="https://docs.lockss.org/en/latest/releases.html#lockss-1-77">LOCKSS 1.77.6</a>.</p><h2>LOCKSS 2.0</h2><p class="plain-text">The re-engineered LOCKSS system (version 2.0), also nicknamed LAAWS for "LOCKSS Architected As Web Services", is an upcoming, modular, open-source, distributed digital preservation system developed by the LOCKSS Program.</p><p class="plain-text">LOCKSS 2.0 is a containerized application orchestrated by Kubernetes, which can run from a single Linux host using an installable Kubernetes distribution.</p><p class="plain-text">The re-engineered LOCKSS system consists of a configurable set of components driven by the LOCKSS Installer and connected to the LOCKSS Configuration Service. The LOCKSS Repository Service stores preserved content in WARC files. Content can be harvested from the Web using a Web crawler registered with the LOCKSS Crawler Service, typically the classic LOCKSS Crawler, or deposited into the LOCKSS Repository Service using its REST API. The LOCKSS Metadata Extraction Service extracts bibliographic metadata from preserved content, and the LOCKSS Metadata Service provides access to it via an OpenURL resolver. Access to the preserved content is facilitated by up to three Web replay engines: Pywb, OpenWayback, and LOCKSS ServeContent. As in the classic system, Web crawling and metadata extraction activities are driven by LOCKSS plugins, and the stored content is preserved by the LOCKSS Poller Service's state-of-the-art implementation of the LOCKSS polling and repair protocol. The LOCKSS Repository Service requires a Solr index and the metadata-related components a PostgreSQL database, both of which can be run as provided containers in the stack (or they can be externally run if desired).</p><p class="plain-text">The latest preview release of the LOCKSS 2.0 system is <a href="https://docs.lockss.org/projects/manual/en/2.0-alpha7/appendix/release-notes.html#lockss-2-0-72-alpha7">LOCKSS 2.0.72-alpha7</a>. The LOCKSS 2.0 system comes with an extensive <a href="https://docs.lockss.org/projects/manual/en/2.0-alpha6/installing">installation manual</a>.</p><h2>Turtles</h2><div class="align-right media-entity-wrapper image"> <div class="media image field-media-image label-hidden"> <img loading="lazy" src="/sites/g/files/sbiybj27616/files/styles/thumbnail/public/media/image/turtles_0.png?itok=NRXGCgLY" width="100" height="100" alt="Turtles logo"> </div> </div> <p>Turtles is a tool to manage LOCKSS plugin sets and LOCKSS plugin registries, written in Python, and available from GitHub.</p><p><a href="https://github.com/lockss/turtles">Learn more about Turtles</a></p><h2>Cross-PLN Technical Working Group</h2><p>The Cross-PLN Technical Working Group maintains a GitHub organization, bringing together software made by Private LOCKSS Networks and made available to all PLNs.</p><p><a href="https://github.com/Cross-PLN-Technical-Working-Group">Learn more on GitHub</a></p></div> </div> </div> </div> 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