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1,741 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 applications can be installed to a container without any modifications. Oracle, DB/2, Weblogic, Websphere and other big applications run just fine 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 So what is OpenVZ different from other technologiesVirtuozzo? =====:See [[Introduction Virtuozzo is a Linux based virtualization platform, combining container and hypervisor virtualization, into a single product. While primarily built for service providers to virtualization]]run cloud services and applications, it is used by variety of businesses, including MSP, SMB and Enterprises.
===== How What is OpenVZ secured & updatedand how it compares to Virtuozzo? =====:See [[Security]]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.
===== How scalable is does Virtuozzo 7/OpenVZ? pair compares to its predecessor (Virtuozzo versions 4.x and 6/OpenVZ) =====Previously, OpenVZ and Virtuozzo were built out of the same code base with some unique patches applied. That warranted the user interfaces to be similar but not identical. With Virtuozzo 7, the compatibility will be on the binary level - effectively the open source components will be the same between OpenVZ and Virtuozzo.
===== How OpenVZ technology scales up pretty well - we've tested users will benefit from it on machines up to 8 CPU and up to 64 GB of RAM? =====OpenVZ components will be undergoing the same testing procedures as the commercial product. BesidesAlso, a single container could be scaled up from taking a little fraction of some new features previously available resources up to all resources on Virtuozzo only (notably hypervisor) will become available dynamically - you do not even have to restart on the containerproduct built for OpenVZ community users.
===== How does OpenVZ improve efficiency of servicesWhat support options are available for Virtuozzo 7? =====For the moment, only preview (beta) versions of Virtuozzo 7 are available. They are intended for development and testing only, not for production. Virtuozzo 7 is not yet commercially supported. For supported commercial version, please refer to [http://www.odin.com/products/virtuozzo/ Virtuozzo 6].
For existing hardware, ===== Why I need Virtuozzo/OpenVZ allows 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 loads. To decrease complexity, OpenVZ provides standardized and centralized server management, logically decoupled from actual hardware. And when its time to buy new servers, you can now use few more powerful servers instead of many little ones — with added benefits LXC exist? =====See our [[comparison]] of better reliability, better peak performance and typically longer lifespandifferent virtualization solutions.
===== How does When OpenVZ improve flexibility of serviceswill be in upstream kernel? =====Our kernel developers [http://openvz.org/File:Kernel_patches_stats.png 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, memory controller, checkpoint-restore and much more.
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 the network. This allows for ease of hardware maintenance (move out all containers and do whatever you need with the box) and improved availability (keep a synchronized copy of your container elsewhere and start it up when primary service failed). If your old box is not able to cope with peak load anymore, just move your containers to a new one.
 
===== What is a performance overhead? =====
 
Near zero. There is no emulation layer, only security isolation, and all checking is done on the kernel level without context switching.
 
===== 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]].
===== Are there any control panels What kind of documentation is available for OpenVZ? =====:See [[Control_panels]].
== Installation :Aside from this wiki, which contains lots of information, you can check extensive [[Man|manual pages]] and upgrade ==[http://docs.openvz.org Virtuozzo documentation].
===== What hardware is supported by Who needs OpenVZ kernel? How it can be used? =====:See [http://www.parallels.com/en/products/virtuozzo/hcl/ Virtuozzo HCL[Use cases]].
===== Why there are different kernel flavours available and what do they meanHow scalable is OpenVZ? =====:See [[Different kernel flavors (UP, SMP, ENTERPRISE, ENTNOSPLIT)]].
===== How do I rebuild the OpenVZ technology scales as well as standard Linux kernel? =====:See — up to thousands of CPUs and terabytes of RAM. Read more about [[Kernel buildWP/Containers_density|OpenVZ containers density]] and [[performance]].
==Installation and upgrade === What does 021stab018 in OpenVZ kernel version mean? =====:See [[Kernel versioning]].
===== How can I check package signaturesto install OpenVZ? =====:See [[Package signatures]].
===== Is it possible to run x86 container on a x86_64 arch? =====There are two versions of OpenVZ available: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 containers? =====* [[Roadmap|stable version]]: OpenVZ legacy (based on RHEL5 and RHEL6 kernels).* [[Roadmap|development version]]: Any filesystem which supports Unix style permissions is usable, such as Ext3 or ReiserFS. XFS works, but does not have support for disk quotas inside containers[[Virtuozzo]] Linux distribution based on RHEL7 kernel.
== Networking ==See [[Quick installation]]
===== How do I set up VPN for a container? =====:See [[VPN via the TUN/TAP device]]. ===== What hardware is veth and how do I use itsupported by OpenVZ kernel? =====:See [[Virtual Ethernet device]]. ===== Why doesn't net-snmpd work on my containers? =====https:See [[SNMPD in container]]. == User Beancounters (UBC) == ===== 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 is able to get X Mb of RAM? =====See [[Setting UBC parameters]]. ===== I can not start a program in container: 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]]hardware. == Troubleshooting ======= My kernel crashedredhat. What should I do? =====:See [[When you have an oops]]. ===== 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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