KVM

(18)
4.3 out of 5 stars

KVM (for Kernel-based Virtual Machine) is an open-source virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V).

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KVM review by <span>Derek D.</span>
Derek D.
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My KVM review!

What do you like best?

KVM has been for our company one of the best virtualization because It supports x86 infrastructure. It's open source and you can download it for free and use for development on your virtual machine. I would say it's easy to use when you know the commands and everything.

What do you dislike?

What I dislike about KVM is the fact you have to know how to install it and it's not easy to install for everyone. Depending on the machines there may be incompatibility issues. The support takes more time to get a reply because it's a free product.

Recommendations to others considering the product

I would recommend to everyone If you want an open source and free replacement for servers then you can give it a try. Configuration is really easy and doesn't takes a lot of time. This is a good solution If you want to install Windows on it. Don't forget this is an open source product so you can really trust this product for your company.

What business problems are you solving with the product? What benefits have you realized?

We saved money with KVM because we needed servers with linux kernels and we just used KVM as virtualization. We installed many linux versions for the costumers and they were really greatful.

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KVM review by <span>Evan L.</span>
Evan L.
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KVM is flexible, available at no cost, but not necessarily for the faint of heart...

What do you like best?

I like that there's no licensing cost. I like the flexibility on tap. Overall with some technical familiarity you can deploy in [relative] confidence.

What do you dislike?

I dislike the steep learning curve, the lack of commercial support, and the finicky nature of the older, less mature versions. Centralized management is not really fleshed out, even though things like WebVirtMgr can be configured. Maintenance can be tricky. Migration from one host to another isn't very straightforward either.

Recommendations to others considering the product

I just read that Amazon is moving AWS away from Xen and towards KVM. That's huge news. I would imagine that it will only become better, more stable, and more fully featured with that kind of user base behind it, on top of the current base!

What business problems are you solving with the product? What benefits have you realized?

In areas where there's no virtualization budget but you need VMs, and can't or won't use VirtualBox or Xen, KVM is an option...

What Server Virtualization solution do you use?

Thanks for letting us know!
KVM review by <span>Blagovest P.</span>
Blagovest P.
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My experience with KVM

What do you like best?

Combined with LibVirt, KVM is one of the easiest and free hypervisors. Windows, Linux or UNIX operating systems runs without any problem. Windows drivers are provided compiled online from RedHat.

What do you dislike?

It's hard for setup if it's used without Libvirt or a similar tool.

Recommendations to others considering the product

Use it with LibVirt or integrated system like ProxMox. ZFS for the file storage is a big advantage! Also, it can be used with storage clusters lice Ceph for a bigger environments. OpenStack, the industry standart for compute clouds is mostly compatible with KVM.

What business problems are you solving with the product? What benefits have you realized?

Our infrastructure is based on KVM and Linux Containers. We had a lot of VMWare legacy but it was converted to Ubuntu and KVM hypervisor for about a year. Management and backup is a lot easier with with Ubuntu and KVM. Especially combined with ZFS and snapshotting.

KVM review by <span>Phil w.</span>
Phil w.
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KVM the FLOSS virtualisation solution

What do you like best?

Kvm is supporting Intel's VMX hardware virtualization which is optimal on intel powered system, I assume it's the same with other ventors isnt AMD providing vt instuctions set too ?

What do you dislike?

It can be confusing to have several incompatible virtualisations system on the same host , which is not possible but afaik there is no abstraction service to switch from one system to an other.

Setting up network interfaces can be confusion, and supporting accelerated GPU is not fully supported, so it can be inappropriate to test opengl application, that said vmware with mesa gallium driver can be an alternative to consider.

Recommendations to others considering the product

you can also look for libvirt and virtman which is providing a nice user interface if you're not confortable with command lines or man pages. Something also useful is to disable the GUI windows and use ncurses mode to use the guest machine on host's terminal. Last but not least even if kvm is a good product maybe there are other way to address isolations needs, for instance containers can also be considered, check also for CGroups, LXC, docker, rocket ...

What business problems are you solving with the product? What benefits have you realized?

I used kvm to test some distros like Tizen:Common which are using the same architectures.

KVM review by <span>chedi t.</span>
chedi t.
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kvm review

What do you like best?

In the Linux world KVM is a very reliable solution that can be used for x86 architecture virtualization with a reasonable overhead. Reliable and extensible, with a tight integration with linux security facilities like SELinux, KVM just does the job.

You will unlikely have to see kvm if you are using a cloud solution because of the seamless integration. If instead you are a Linux desktop user, KVM is the solution to go if you have to start virtual machines with linux or other operating systems with almost zero extra configuration needed.

That said, KVM have a rich options set that can be directly used or via wrappers like LibVirt.

What do you dislike?

The support of virtualization in the recent generation of x86 processor is almost a must have, so the only negative aspect of needing hardware support to have a fully functional kvm can be dropped. It would be nice if the support for other platform like ARM or Risk was as good as the x86 one, but I think with the democratization of chromebooks based on these chips and mobile devices, it will not take long for that to happen.

What business problems are you solving with the product? What benefits have you realized?

Full system virtualization is a necessity for some testing cases or in the event of evaluation of new functionnalities. Booting up a vm in a few seconds and having an almost genuine systems that can be can linked in very different network typologies for almost zero configuration were the main reasons of our choice of kvm.

KVM review by User in Telecommunications
User in Telecommunications
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KVM - Kernel based Virtual Manager

What do you like best?

It integrates into the Linux kernel and hence it is easy to launch - like does not need to be installed like other hypervisors E.g oracle virtualbox or vmware player. It exists in the kernel as a module and hence it is loaded when the kernel starts and keeps running

What do you dislike?

the process of setting up virtual machines is not very easy and needs more knowledge and practice unlike using other user friendly hypervisors like Oracle virtualbox where everything is GUI based and can be done with the click of mouse.

Recommendations to others considering the product

KVM is the default hypervisor for Linux based hosts though other tools like virtualbox can be used.

What business problems are you solving with the product? What benefits have you realized?

I used KVM as part of HP blade servers to spin up new virtual machines for various VNFs. Though there was an initial learning, but once learned it was easy to manage the VNFs - their lifecycle (instantiation, upgrade, downgrade, etc)

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