is a customized LAMP stack with additions such as Linux Virtual Server (LVS) for load balancing and Ceph and Swift for distributed object storages. Software components Linux Linux is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution. Most Linux distributions, as collections of software based around the Linux kernel and often around a package management system, provide complete LAMP setups through their packages. According to W3Techs in October 2013, 58.5% of web server market share is shared between Debian and Ubuntu, while RHEL, Fedora and CentOS together shared 37.3%. Apache The role of LAMP's web server has been traditionally supplied by Apache, and has since included other web servers such as Nginx. Until 2022, Apache HTTP Server was the most popular web server on the public Internet. In June 2013, Netcraft estimated that Apache served 54.2% of all active websites and 53.3% of the top servers across all domains. According to W3Tech's web server count, only in June 2022 did Nginx bypass Apache in popularity, with a share of 33.6% versus Apache at 31.4%. Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. Released under the Apache License, Apache is open-source software. A wide variety of features are supported, and many of them are implemented as compiled modules which extend the core functionality of Apache. These can range from server-side programming language support to authentication. MySQL and database alternatives MySQL's original role as the LAMP's relational database management system has since been alternately provisioned by others like PostgreSQL, MariaDB (a community-developed fork of MySQL developed by its original developers), and even NoSQL databases like MongoDB. MySQL is a multithreaded, multi-user, SQL database management system, acquired by Sun Microsystems in 2008, which was then acquired by Oracle Corporation in 2010. Since its early years, the MySQL team has made its source code available under the terms of the GNU General Public License, as well as under a variety of proprietary agreements. PostgreSQL is also an ACID-compliant object-relational database management system developed by PostgreSQL Global Development Group. MongoDB is a NoSQL database that eschews the traditional relational database structure in favor of JSON-like documents with dynamic schemas (calling the format BSON), making the integration of data in certain types of applications easier and faster. PHP and alternatives PHP's role as the LAMP's application