I just did a talk titled ‘Live Migration of Virtual Machines From The Bottom Up‘ at the FOSDEM conference in Brussels, Belgium. The slides are available at this location.
The talk introduced the KVM stack (Linux, KVM, QEMU, libvirt) and live migration; introduced ways the higher layers (especially oVirt and OpenStack) use KVM and migration, and what challenges the KVM team faces in working with varying use-cases and new features added to make migration work, and work faster.
There was a video recording, I will post the link to it in a separate post.
QEMU is the software that creates virtual hardware which guest operating systems run on top of. All (well, almost all — see note below[*]) the hardware that a guest OS has access to is actually written to some specifications in software — i.e. no physical hardware is involved. For the QEMU/KVM hypervisor, most of these devices are written in the QEMU source repository. A few devices are part of the KVM code in the Linux kernel. QEMU also handles a lot of host-specific stuff, like storage and networking for the virtual machines.
[* Exception: physical hardware devices assigned to guests.]
Many contributors to the QEMU and KVM projects meet at the annual KVM Forum conference to talk about new features, new developments, what changed since the last conference, etc.
The QEMU project released version 2.4 just a week before the 2015 edition of KVM Forum. I thought that was a good opportunity to gather a few developers and maintainers, and get them on video where we can see them speak about the improvements they made in the 2.4 release, and what we can expect in the 2.5 release.
Continue reading “QEMU Maintainers on the 2.4 Release”
I’ve written previously about random numbers in virtual machines. KVM still remains the only hypervisor to offer an RNG device to guests.
Quite a lot of exciting changes have landed in the upstream Linux kernel since that last post. I have written an article in the RHEL blog about it: Red Hat Enterprise Linux Virtual Machines: Access to Random Numbers Made Easy.
That articles talks about the improvements in the recent RHEL 7.1 release. In upstream terms, all the changes written about have landed in kernel 3.17; so Fedora 21 out-of-the-box, and Fedora 20 after updates, have benefited from the additions.
All the benefits listed in the article apply to all Linux guest VMs running under KVM if they have the virtio-rng device enabled, and run kernel 3.17+ in the guest.
When the call for bids for FUDCon APAC 2015 was put out, a few of us huddled together to discuss a bid from India. We had already organised a successful FUDCon in Pune in 2011, so our initial conversations were around which city to host it in. Pune won again, just because the number of volunteers available in Pune are more than any other place in India, and Pune has several technical colleges, which makes hosting the event at one of them easier.
This time around, we’re proposing to host the FUDCon at the MITCOE campus, more details in the bid page.
Continue reading “Pune Bidding Again for FUDCon APAC!”
I spoke at the CentOS Dojo in Pune yesterday on new features available in CentOS release 7.0 since the 6 release. Slides are available here: What’s New in Virtualization. The event was organized by the Pune GNU/Linux Users Group (PLUG) for the CentOS project.
Continue reading “My talk at the CentOS Dojo Pune 2014”
It’s been a couple of weeks that I’ve returned from Düsseldorf, Germany, after attending the seventh KVM Forum; an event where developers and users of the Linux virtualization technology gather to discuss the state of the hypervisor and tools around it, and brainstorm on future plans. As with the previous few years, the event was co-located with LinuxCon Europe.
A few observations from the event, in random order:
Continue reading “KVM Forum 2014”
The 2014 edition of KVM Forum is less than a week away. The schedule of the talks is available at this location. Use this link to add the schedule to your calendar. A few slides have already been uploaded for some of the talks.
As with last year, we’ll live-stream and record all talks, keep an eye on the wiki page for details.
One notable observation about the schedule is that it’s much relaxed from the last few years, and there are far fewer talks in parallel this time around. There’s a lot of time for interaction / networking / socializing. If you’re in Dusseldorf next week, please come by and say ‘hello!’
I participated in the OpenStack Meetup at the Red Hat Pune office a few weekends ago. I have been too caught up on the lower-level KVM/QEMU layers of the virt stack, and know there aren’t too many people involved in those layers in Pune (or even India); and was curious to learn more about OpenStack and also find out more about the OpenStack community in Pune. The event was on a Saturday, which means sacrificing one day of rest and relaxation – but I went along because curiousity got the better of me.
This was a small, informal event where we had a few talks and several hallway discussions. Praveen has already blogged about his experiences, here are my notes about the meetup.
Continue reading “OpenStack Pune Meetup”
The KVM Forums are a great way to learn and talk about the future of KVM virtualization. The KVM Forum has been co-located with the Linux Foundation’s LinuxCon events for the past several years, and this year too will be held along with LinuxCon EU in Dusseldorf, Germany.
The KVM Forums also are a great documentation resource on several features, and the slides and videos from the past KVM Forums are freely available online. This year’s Forum will be no different, and we’ll have all the material on the KVM wiki.
For a long time various people have been telling me there’s not much information on the low-level / plumbing details of the virt stack on Linux. Especially information related to qemu and its various settings, devices, and so on.
Documentation surely is difficult to come by, but a quick and straightforward solution is to syndicate all of the blog posts that people doing virt development write into a common stream: a planet virt. I started hosting and testing such an instance on openshift, but was quickly pointed to the existing Virt Tools Planet by Rich Jones and Dan Berrange. Dan added the list of people whose blogs I followed for virt development to that instance.
I updated the KVM and QEMU wikis to ensure the Planet gets more visibility, and hope this goes a small way to quell the complaints of not enough available information.