# Apache CloudStack Regular Release 4.21.0.0 The Apache CloudStack project is pleased to announce the release of CloudStack 4.21.0.0.
The CloudStack 4.21.0.0 release is a Regular release and contains 15 new features, around 40 improvements and more than 150 bug fixes since 4.20. Some of the highlights include: * CloudStack Extensions Framework and Orchestrate Anything extension, with built-in extensions for Proxmox and Hyper-V * GPU Integration with KVM in CloudStack (Technical Preview) * Netris Network Plugin Integration * Cloudian HyperStore Object Store Plugin Integration * CloudStack Kubernetes Service (CKS) Enhancements * Create Instance from Backup * Instance Lease (Automatic Stop/Deletion) * Backup and Object Storage Limits * Virtual Trusted Platform Module (vTPM) Support * Support for KVM on s390x (IBM Z and LinuxONE) architecture * Management Server Maintenance Mode * Incremental Volume Snapshots for KVM * File-Based Disk-Only Instance Snapshots with KVM * Reconciliation of VM and Volume Copy/Migrate operations for KVM agent * Storage Access Groups * Volume Allocation Algorithm Support * VMware to KVM migration improvements * Storage plugins - Ceph, PowerFlex, StorPool, Linstor related fixes and improvements * Several UI fixes and improvements, including Deploy Instance Form, Announcement Banner, etc CloudStack Regular releases are supported only up to the next regular or LTS release and can upgrade to the next releases when they are available. Apache CloudStack is an open-source software system designed to deploy and manage large networks of virtual machines, as a highly available, highly scalable Infrastructure as a Service (IaaS) cloud computing platform. CloudStack includes an intuitive user interface and rich API for managing the compute nodes, networking software, and storage resources, that allows users to build feature-rich public and private cloud environments. The project became an Apache top-level project in March, 2013 and is currently deployed in thousands of organizations globally. More information about Apache CloudStack can be found at: https://cloudstack.apache.org/ # Documentation What's new in CloudStack 4.21.0.0: https://docs.cloudstack.apache.org/en/4.21.0.0/releasenotes/about.html The 4.21.0.0 release notes include a full list of issues fixed, as well as upgrade instructions from previous versions of Apache CloudStack, and can be found at: https://docs.cloudstack.apache.org/en/4.21.0.0/releasenotes/ The official installation, administration, and API documentation for each of the releases are available on our documentation page: https://docs.cloudstack.apache.org/ # Downloads The official source code for the 4.21.0.0 release can be downloaded from our downloads page: https://cloudstack.apache.org/downloads.html In addition to the official source code release, individual contributors have also made convenience binaries available on the Apache CloudStack download page, and can be found at: https://download.cloudstack.org/el/8/ https://download.cloudstack.org/el/9/ https://download.cloudstack.org/suse/15 https://download.cloudstack.org/ubuntu/dists/ https://www.shapeblue.com/packages/ Please check them after 24 hours to give the mirrors time to catch up.
