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1,681 bytes removed, 02:45, 27 November 2018
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{{Virtuozzo}}
 
== General ==
===== What is a container (Virtual Environment, Virtual Private Server, VPS, VE)? =====
:See [[Container]].
 
===== What are highlights of OpenVZ technology? =====
In short, OpenVZ is the only highly scalable virtualization technology with near-zero overhead, strong isolation and rapid customer provisioning that's ready for production use right now. Deployment of OpenVZ improves efficiency, flexibility and quality of service in the enterprise environment.
 
===== Who needs OpenVZ? How it can be used? =====
:See [[Use cases]].
 
===== What applications can run inside an OpenVZ container? =====
 
Most of applications can be installed to a container without any modifications. Oracle, DB/2, Weblogic, Websphere and other big applications run just find inside an OpenVZ container. Applications and services do not have to be aware of OpenVZ. However, direct access to hardware is not available by default.
 
===== How is OpenVZ different from other technologies? =====
:See [[Introduction to virtualization]].
 
===== How is OpenVZ updated and why it is secure? =====
:See [[Security]].
 
===== How scalable is OpenVZ? =====
OpenVZ technology scales up pretty well - we've tested it on machines up to 8 CPU ===== So what is Virtuozzo? =====Virtuozzo is a Linux based virtualization platform, combining container and up to 64 GB of RAM. Besideshypervisor virtualization, into a single container could be scaled up from taking a little fraction product. While primarily built for service providers to run cloud services and applications, it is used by variety of available resources up to all resources available dynamically - you do not even have to restart the containerbusinesses, including MSP, SMB and Enterprises.
===== How What is OpenVZ improves efficiency of servicesand how it compares to Virtuozzo? =====OpenVZ is a free and opensource portion of Virtuozzo. It includes core of Virtuozzo functionality, like kernel and command line management tools for creating and managing containers. Virtuozzo includes everything that OpenVZ does, plus additional features and services available with the commercial version only.
For existing hardware, ===== How does Virtuozzo 7/OpenVZ allows pair compares to utilize its processing power better by improving average load from 3-5% to at least 30-50%, while still providing ability to handle peak loadspredecessor (Virtuozzo versions 4. To decrease complexityx and 6/OpenVZ) =====Previously, OpenVZ provides standardized and centralized server management, logically decoupled from actual hardwareVirtuozzo were built out of the same code base with some unique patches applied. And when its time That warranted the user interfaces to buy new serversbe similar but not identical. With Virtuozzo 7, you can now use few more powerful servers instead of many little ones — with added benefits of better reliability, better peak performance the compatibility will be on the binary level - effectively the open source components will be the same between OpenVZ and typically longer lifespanVirtuozzo.
===== How OpenVZ improves flexibility of servicesusers will benefit from it? =====OpenVZ components will be undergoing the same testing procedures as the commercial product. Also, some new features previously available on Virtuozzo only (notably hypervisor) will become available on the product built for OpenVZ community users.
By providing unified scalable platform with such unique features as rapid application and updates provisioning. Each container is hardware independent and can be moved to another OpenVZ-based system in seconds over ===== What support options are available for Virtuozzo 7? =====For the network. This allows for ease of hardware maintenance moment, only preview (move out all containers and do whatever you need with the boxbeta) and improved availability (keep a synchronized copy versions of your container elsewhere Virtuozzo 7 are available. They are intended for development and start it up when primary service failed)testing only, not for production. If your old box Virtuozzo 7 is not able to cope with peak load anymoreyet commercially supported. For supported commercial version, just move your containers please refer to a new one[http://www.odin.com/products/virtuozzo/ Virtuozzo 6].
===== What is a performance overheadWhy I need Virtuozzo/OpenVZ when LXC exist? =====See our [[comparison]] of different virtualization solutions.
Near zero===== When OpenVZ will be in upstream kernel? =====Our kernel developers [http://openvz.org/File:Kernel_patches_stats. There is no emulation layerpng work hard] to merge containers functionality into the upstream Linux kernel, making OpenVZ team the biggest contributor to Linux Containers (LXC) kernel, with features such as PID and network namespaces, only security isolationmemory controller, checkpoint-restore and all checking is done on the kernel level without context switchingmuch more.
===== What are performance expectations? =====
 
Peak performance is achieved when only one container has active tasks. In this case, it could use 100% of available resources: all CPUs, all physical memory, all disk and network bandwidth. OpenVZ is not limiting you to a single-CPU virtual machine.
===== I want to show my appreciation to OpenVZ and put some logo to my site. Where to get it? =====
:See [[Artwork]].
== Installation and upgrade == ===== What hardware kind of documentation is supported by OpenVZ kernelavailable? =====:See [http://www.parallels.com/en/products/virtuozzo/hcl/ Virtuozzo HCL].
===== Why there are different kernel flavours available and what do they mean? =====:See Aside from this wiki, which contains lots of information, you can check extensive [[Different kernel flavors (UP, SMP, ENTERPRISE, ENTNOSPLIT)Man|manual pages]]and [http://docs.openvz.org Virtuozzo documentation].
===== Who needs OpenVZ? How do I rebuild the kernelit can be used? =====:See [[Kernel buildUse cases]].
===== What does 021stab018 in How scalable is OpenVZ kernel version mean? =====:See [[Kernel versioning]].
===== How can I check package signatures? =====:See OpenVZ technology scales as well as standard Linux kernel — up to thousands of CPUs and terabytes of RAM. Read more about [[Package signaturesWP/Containers_density|OpenVZ containers density]] and [[performance]].
==Installation and upgrade === Is it possible to run x86 container on a x86_64 arch? =====:Sure :) We actually did some work on that to enable migration of x86 container from x86 to x86_64 and back, and to enable using 32-bit iptables in 32bit container on an x86_64 system.
===== What filesystems should I choose for saving my containersHow to install OpenVZ? =====: The safest choice is ext2/3 to save your containers. Remember that ReiserFS is less stable than ext2/3.: If you choose to use XFS, there will be no support for disk quota inside containers.
== Networking ==There are two versions of OpenVZ available:
===== How do I set up VPN for a container? =====* [[Roadmap|stable version]]: OpenVZ legacy (based on RHEL5 and RHEL6 kernels).* [[Roadmap|development version]]:See [[VPN via the TUN/TAP deviceVirtuozzo]]Linux distribution based on RHEL7 kernel.
===== What is veth and how do I use it? =====:See [[Virtual Ethernet deviceQuick installation]].
===== Why doesn't net-snmpd work on my containers? =====:See [[SNMPD in container]]. == User Beancounters == ===== What are those User Beancounters? =====See [[UBC]]. ===== What units are UBC parameters measured in? =====See [[UBC parameter units]]. ===== How do I set up a container which hardware is able to get X Mb of RAMsupported by OpenVZ kernel? =====:See [[Setting UBC parameters]]. ===== I can not start a program in containerhttps: it reports out of memory. What do I do? =====See [[Resource_shortage]]. ===== How can I reset <code>failcnt</code> in <code>/proc/user_beancounters</code>? =====See [[UBC failcnt reset]]. == Troubleshooting ======= My kernel crashedhardware. What should I do? =====:See [[When you have an oops]]redhat. ===== I see a lot of processes in D state. What does that mean? =====:See [[Processes in D state]com/ RHEL Hardware Compatibility List].
== Quick reference card for === How existing OpenVZ users can upgrade to the [[Virtuozzo|new version]]? ====={{PDFlinkWhile there is no in-place upgrade, we prepared [[Upgrade_script_from_OpenVZ_to_Virtuozzo_7|[http://pronicsupgrade script]] for OpenVZ users to move their containers to the new platform.fi/~eero/mirrors/openvz-reference-cardThe script allows to transfer containers from old to new OpenVZ version (or from OpenVZ to Virtuozzo).pdf openvz-reference-card.pdf]}}
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