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bio website linkedin.com/in/dyasny
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Open source virt geek


Apr
7
comment Cannot add any virtio discs in virt-manager, how to fix?
There is nothing that would block virtio. If it doesn't show up, I'd start looking at the code, and that usually means a bug. Try to update both hosts to the same patch level to make sure you are running the same code in both locations
Apr
6
comment Cannot add any virtio discs in virt-manager, how to fix?
Looks like a bug to me. Report it in debian's BZ
Apr
4
comment Which CPU model to set for guest KVM when processor is Ivy Bridge?
So much for the amazing evc feature. I've always laughed at the amount of marketing bsaround it while libvirt was doing the same thing all along at no extra cost
Apr
2
comment Emulate VMware vswitch on KVM
Not to repeat myself, I just typed an answer to this yesterday: serverfault.com/questions/585774/…
Apr
1
comment Persistent Network Configuration using KVM and libvirt
well, if there's only one tag that you want to set on the switch that's also fine, just tag the traffic on the port, and use a bridge. Since everything arriving at the NIC will be tagged, the bridge will relay the traffic to the VMs as is
Apr
1
comment Which CPU model to set for guest KVM when processor is Ivy Bridge?
With no AES, are you sure this is Ivy Bridge?
Apr
1
comment Persistent Network Configuration using KVM and libvirt
No, the way this works is NIC-VLAN-Bridge-VM, not NIC-Bridge-VLAN-VM. So for every VLAN you simply create a bridge and plug the VM into that bridge for tagged traffic access. If you have a small set of VLANs you will be using, just create all those VLAN IFs and bridges and plug VMs into whatever bridge+VLAN you need dynamically, without touching the host configuration
Apr
1
comment Which CPU model to set for guest KVM when processor is Ivy Bridge?
It's very easy to mess up, since most vendors ship hardware with everything virtualization related disabled (for security reasons). looks like you're missing the aes flag, do you see it in /proc/cpuinfo ?
Apr
1
comment Persistent Network Configuration using KVM and libvirt
@MichaelHampton VLANs are very easy to implement without the complexity of OVS, using simple bridging, see my answer below
Apr
1
comment Which CPU model to set for guest KVM when processor is Ivy Bridge?
it should work with the sandybridge setting, both are pretty much at the same instruction set (two generations of E3 basically). If you're missing a CPU flag, check your BIOS settings, you might have CPU features disabled, or your PC manufacturer has a locked down BIOS disabling CPU features (I know Sony like to do that)
Apr
1
comment Which CPU model to set for guest KVM when processor is Ivy Bridge?
libvirt can autoselect it for you. If you're using cmd line just use -cpu host
Mar
31
comment Bridging is breaking the server: KVM configuration
So you only have one NIC, not two, as the guide suggests. This means you can't have two, local and WAN networks, and you only need to use one NIC as the WAN network link, skipping the entire LAN thing. Do you have multiple public IPs available for the WAN? Are they all in the same subnet?
Mar
31
comment Migrate CentOS VM using LVM on IDE to run with VirtIO
Why not simply backup the old VMs, and restore to new, working VMs (running 5.10)?
Mar
28
comment How do I configure bridged networking for VMs
copy the working scripts to another folder and run an overwrite command every few minutes through cron, add service network restart at the end and your script is ready
Mar
21
comment CentOS Virt-v2v conversion tool
so this particular issue has been resolved?
Mar
21
comment CentOS Virt-v2v conversion tool
Have you tried "default" instead of the path?
Mar
18
comment How to mount a URL as a CD-ROM on QEMU?
when you point to an ISO, the data is accessed directly. To use a URL, qemu must have a built-in http client
Mar
14
comment __ticket_spinlock high cpu
Well, I've been working with KVM issues since 2008 on a daily basis, and ubuntu 8-10 was particularly horrible, the amount of bugs was incredible, especially when none of them could be reproduced under RHEL. It is still way behind RHEL and Fedora in terms of stability as a hypervisor, and no wonder - all the work in the area (kvm/qemu/libvirt/lvm/dm-multipath/cgroups/etc) is being done primarily at RHT and tested under Fedora and then RHEL.
Mar
14
comment When deploying a single server on new hardware, do you virtualize it or not?
simple example - I need to run an AD/DNS/DHCP server and a terminal server. I can go and purchase two windows licenses, but I get one 2012r2std license, and run two VMs on this license. $700 savings right there.
Mar
13
comment __ticket_spinlock high cpu
you are on an old and known buggy version of Ubuntu, using KVM, which is known to work much better on Fedora/RHEL. Why do you insist on staying there and fighting bugs when you can switch to a normal distribution?