Anti-DDoS: Our anti-DDoS solutions- OVHOVH Mitigation Understanding mitigationThe Anti-DDoS solutionVAC Technology Support & InformationOVH Mitigation
Reinforce your infrastructure
It's not a question of knowing if you need anti-DDoS protection but rather when you will first be the victim of an attack. OVH is committed to protecting your project 24/7 against any type of DDoS attack, regardless of duration or size.
Octave Klaba, OVH CTO
Our offers and guaranteed SLA
Anti-DDoS PRO
Anti-DDoS GAME
Related products
, , ,, Dedicated servers ( , ,,
Eligibility
Included by default
Included with the Professional Use option
Free with the Dedicated GAME servers
Number of attacks per month
Gbps limit of attack
Duration of attacks per month
Type of attack
Detection and Auto-Mitigation
Multi-point Mitigation
Central Europe (SBG)
Western Europe (RBX)
North America (BHS)
Permanent mitigation
Two-way mitigation
(L3/L4/L7)
3 Tbps Surplus network
Firewall Network
Configurable
Configurable
Customisable*
Customisable*
Manager v6
*: Available soon
All OVH servers will benefit from automatic anti-DDoS mitigation by default in the event of an attack (reactive mitigation).
Anti-DDoS PRO
Subscribing to professional use for your server enables access to permanent mitigation (the permanent settings) and configuration of the .
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vultr价格的问题
COMPUTE INSTANCES
和 STORAGE INSTANCES
有啥区别&&同配置 价格差一半啊
一个是ssd 一个是hdd&&后者是大硬盘的
普通的是SSD，STORAGE是大硬盘HDD
大硬盘无法用 IO
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Virtuozzo is a proprietary operating system
virtualization product produced by SWsoft, Inc. A version that supports
Linux has been available since 2001. Virtuozzo creates multiple,
isolated virtual environments (VEs, otherwise known as Virtual Private
Servers , or VPS) on a single physical server . This allows the sharing
of hardware, systems management effort, and sometimes software licenses
among different workloads.
VPS behaves in most respects as if it were a stand-alone server. Each
VPS has its own superuser (Root or Administrator), set of users/groups,
IP address(es), processes, files, applications, system libraries and
configuration files. The VPS is completely accessible via the network.
Due to virtualized network stack, a VPS owner can have his own routing
tables and firewall (iptables) rules.
Each VPS is a separate entity, and from the
point of view of its owner it looks like a real physical server. So each
VPS has its own:
Files, system libraries.
Applications.
Virtualized /proc and /sys and virtualized locks.
Each VPS has its own Root Access, as well as other users and groups.
Standard UNIX per-user and per-group disk quotas.
Each VPS only sees its own processes (starting from init). PIDs are virtualized, so that the init PID is 1 as it should be.
Virtual network device, which allows a VPS to have its own IP addresses,
as well as a set of netfilter (iptables) and routing rules.
IPC objects such as Shared memory, semaphores, messages.
Virtuozzo can support tens to hundreds of Virtual Private
Servers (VPS) on a single server due to its use of operating
system-level virtualization.
Virtuozzo virtualizes at the operating system
level, rather than at the hardware level as other Virtual Machine (VM)
products frequently do. Whereas VMs attempt to virtualize "a complete
set of hardware," VPSs represent a "lighter" abstraction, virtualizing
instead "an operating system instance". All VPSs run atop a single
operating system kernel. The VPS mechanism multiplexes this one OS
kernel to look like multiple OS (and server) instances, especially from
the perspective of running applications, users, and network services.
Virtuozzo is based on OpenVZ , and its concepts are similar to other
operating system-level virtualization implementations, including Solaris
Containers and FreeBSD Jail.
they virtualize less, VPSs impose lower overhead than VMs. As a result,
more VPSs can be supported on a given server. Proponents occasionally
claim "thousands of VPSs per server" in test situations to determine the
upper limits of the technology. Virtuozzo supports servers with up to
64 x86 CPUs and 64 GB of RAM, but 1-4 CPU systems are far more common in
Checkpointing and live migration.
A live migration and checkpointing feature was released for OpenVZ in
the middle of April 2006. It allows to migrate a VPS from one physical
server to another without a need to shutdown/restart a VPS. The process
is known as checkpointing: a VPS is frozen and its whole state is saved
to the file on disk. This file can then be transferred to another
machine and a VPS can be unfrozen (restored) there. The delay is about a
few seconds, and it is not a downtime, just a delay. Since every piece
of VPS state, including opened network connections, is saved, from the
user's perspective it looks like a delay in response: one database
transaction takes a longer time than usual, when it continues as normal
the user doesn't notice that his database is already running on another
machine. That feature makes possible scenarios such as upgrading your
server without any need to reboot it: if your database needs more memory
or CPU resources, you just buy a newer better server and live migrate
your VPS to it, then increase its limits. If you want to add more RAM to
your server, you migrate all VPSs to another one, shut it down, add
memory, start it again and migrate all VPSs back.
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