Comparison

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Yellowpin.svg Note: This comparison doesn't include Docker, because Docker is not a virtualization solution. It automates the deployment of applications inside software containers, by providing an additional layer of abstraction and automation of operating-system-level virtualization.[1]


Disclaimer[edit]

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Feature comparison of different virtualization solutions[edit]

Feature Description OpenVZ Virtuozzo 6 (PCS 6) OpenVZ 7 Virtuozzo 7 LXC Proxmox VE Microsoft Hyper-V 2012 R2 RHEV 3.5 Citrix XenServer 6.5
1. Virtualization platform
1.1. Overview
HW virtualization support (Hypervisor) Full emulation of underneath hardware level: full isolation guest environment, no dependencies from host OS, overhead for hypervisor layer. No Yes Yes Yes No Yes Yes Yes Yes
OS-level virtualization (Containers) Sharing the same instance of host OS: high density, high performance, high dependencies from host OS. Yes Yes Yes Yes Yes Yes No No No
Hypervisor technology Technology that enables to run Virtual Machines. No Parallels Desktop Monitor KVM KVM None KVM Hyper-V KVM Xen
Windows guest OS additional support WHQL-signed drivers, SVVP certification N/A Yes No Yes No No Yes Yes Yes
Containers technology Technology that enables to run Containers. Virtuozzo Containers Virtuozzo Containers with enhancements Virtuozzo Containers with enhancements Virtuozzo Containers with enhancements Linux containers LXC (moved from OpenVZ since 4.0) No No No
1.2. Memory
Memory Overcommit Ability to present more memory to virtual machines than physically available Yes Yes Yes, with new VCMMD memory management Yes, with new VCMMD memory management Yes Yes Yes Yes Yes
Page sharing Memory (RAM) savings through sharing identical memory pages across virtual machines Yes Yes, only for CTs Yes Yes Yes Yes No Yes No
Online Memory Management for VM Ability to change amount of RAM for CT and VM without reboot No No Yes Yes N/A No Yes No No
2. Management
2.1. General
Unified management tool for CTs and VMs Single tool for managing both containers and virtual machines (if applicable) N/A Yes Yes Yes No Yes N/A N/A N/A
OpenStack integration Integration with OpenStack components (see details) Yes, only Nova Yes Yes Yes Yes No Yes Yes Yes
Integrated GUI Centralized multi-server management Yes, 3rd party Yes, Parallels Virtual Automation (PVA) No Yes, Virtual Automator Yes, 3rd party Yes Yes, System Center Virtual Machine Manager Yes, RHEV Manager Yes, XenCenter
2.2. Upgrade & Backup
Live VE snapshot Ability to take a snapshot of a virtual environment while the guest OS is running (e.g. for roll-back or backup purposes) Yes Yes Yes Yes Yes Yes Yes Yes Yes
Integrated Backup Are backup plugins/tools provided to backup virtual environments (over and above the ability to perform classic backup using agents in the guests) No Yes No Yes No Yes Yes No No
Backup Integration API Integration with 3rd party backup applications for backup of the virtual environment. No (only through snapshots) Yes Yes Yes No (only through snapshots) Yes (vzdump) Yes Yes No
2.3. Others
VEs Templates (VM, CT) Ability to create and store master images and deploy virtual machines from them Yes (CT only) Yes Yes Yes Yes (OpenVZ templates) Yes Yes Yes Yes
P2V migration Integrated or added P2V (or V2V) capability in order to convert physical systems to virtual environment. No Yes Yes Yes No No, 3rd party tools Yes No No
3. VE Mobility and HA
3.1. VE Mobility
Live Migration Ability to migrate virtual machines between hosts without perceived downtime Yes, but with no zero downtime Yes, Kernel-Level Migration Yes, CRIU for containers Yes, CRIU for containers Yes Yes Yes Yes Yes
DRS/Host Maintenance Mode Ability to put host into maintenance mode which will automatically live migrate all VEs onto other available hosts so that the host can be brought shut down safely No No No No No No Yes Yes Yes
Distributed Power Management Distributed Power Management features Ability to automatically migrate VEs onto fewer hosts and power off unused capacity (hosts), wake systems back up when required No No No No No No Yes Yes Yes
3.2. HA / DR
Integrated HA Recover virtual environment in case of host failures through restart on alternative hosts (downtime = restart time) No Yes No Yes No Yes Yes Yes Yes
4. Network and Storage
4.1. Storage
Supported Storage Supported types of Storage (DAS, NAS or SAN) DAS (EXT4) NAS (NFS), DAS (EXT4) DAS (EXT4) NAS (NFS), DAS (EXT4) NAS (NFS), DAS (EXT4) DAS, NAS (NFS, ZFS), SAN (iSCSI), Ceph  DAS, NAS (SMB), SAN (iSCSI, FC, FCoE) DAS, NAS (NFS), SAN (iSCSI, FC, FCoE) DAS, NAS (NFS), SAN (iSCSI, FC, FCoE)
Virtual Disk Format Supported format(s) of the virtual disks for the virtual machines CT - ploop CT - ploop, VM - ploop CT - ploop, VM - ploop\Qcow2 CT - ploop, VM - ploop\Qcow2 Any Qcow2, vmdk, raw vhdx, vhd, pass-though (raw) Qcow2, raw disk vhd, raw disk
Thin Disk Provisioning Ability to over-commit overall disk space by dynamically growing the size of virtual disks based on actual usage rather than pre-allocating full size. Yes Yes Yes Yes Yes, depends on disk format (dm-thin) Yes, depends on underlying storage driver Yes Yes Yes
Virtual SAN Enhanced storage capability e.g. providing a virtual SAN through virtualized 'local' storage No Yes, Virtuozzo Storage No Yes, Virtuozzo Storage Yes, but 3rd party (DRBD 9, Ceph, GlusterFS) Yes, but 3rd party (DRBD 9, Ceph, GlusterFS, sheepdog) Yes, Storage Spaces Yes, Red Hat Storage No
Storage QoS Ability to control Quality of Service for Storage I/O or Throughput for CT/VM Yes Yes No Yes No Yes, VMs only Yes Yes Yes
4.2. Network
Network QoS Ability to create and store master images and deploy virtual machines from them Only bandwidth limits Only bandwidth limits Only bandwidth limits Only bandwidth limits Only bandwidth limits Yes, with Open vSwitch  Yes Yes Yes
5. Others – most of features are relevant only for Virtuozzo editions
Memory deduplication for binary files Memory and IOPS deduplication management that enables/disables caching for Container directories and files, verifies cache integrity, checks Containers for cache errors, and purges the cache if needed No Yes, pfcache No Yes, pfcache No No N/A N/A N/A
Completely isolated disk subsystem for CTs Yes, ploop Yes, ploop Yes, ploop Yes, ploop Yes, with LVM Yes, LVM, ZFS, or loop devices N/A N/A N/A
API\SDK OpenVZ API for Ruby, LibVirt Virtuozzo SDK, LibVirt Virtuozzo SDK, LibVirt Virtuozzo SDK, LibVirt LibLXC, API for Ruby, Python 2, Haskell, Go Proxmox VE uses a REST like API (JSON data format) Windows SDK RHEV-M API: REST API, SDKs XenAPI, XenServer SDKs
Image Catalog integration Integration with 3rd-party image catalog services of popular server applications and development environments that can be installed with one click. No Yes Application Image Catalog Virtuozzo Application Catalog No Yes Application Image Catalog Virtuozzo Application Catalog No Yes (Turnkey) No No No
Kernel update without reboot Integrated ability to upgrade kernel or install security patches without downtime. No, only 3d party tools Yes, Rebootless Kernel Update No Yes ReadyKernel Service No, only 3d party tools No, only 3d party tools N/A No, only 3d party tools No, only 3d party tools
Power Panel A tool used for managing particular virtual machines and containers by their end users. No Yes No Yes None None None None None
Secure for using in public networks Yes Yes Yes Yes No[2], [3] No[2], [3] Yes Yes Yes
6. Commercial
Open Source Yes No Yes No Yes Yes No No (but there is Open Source edition(oVirt)) No (but there is Open Source edition)
License\Subscription No Yes No Yes No No Yes Yes Yes, Enterprise Edition
Support Both community and commercial support Commercial support Community support Commercial Support Yes, Canonical Ltd. Both community and commercial support Commercial support Commercial support Both community and commercial support
EOL policy 5 years of support 7 years of support TBD 7 years of support 11 years of support]
  1. Wikipedia article about Docker
  2. 2.0 2.1 LXC Security Analysis
  3. 3.0 3.1 Security issues and mitigations with LXC