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Linux VM Host Choices

From: Stephen Kraus 
------------------------------------------------------
Thought I'd bring this up, partially to praise Xen.

I inherited a bunch of Xenservers at the new job I got, and expected
trouble partially due to the very poor setup of the prior IT service
provider.

I could not have been more wrong. I am really thrilled with XenServer,
especially after I pushed a few updates and migrated all the VMs onto an
iSCSI SAN.

Whats your VMs of choice?

=============================================================== From: Lynn Dixon ------------------------------------------------------ My hypervisor of choice is going to be KVM.

=============================================================== From: Wil Wade ------------------------------------------------------ Recently setup a Xen server here at SupplyHog for dev and internal stuff. Quite nice once I got the hang of it and got use to appending "xe" to all my searches to make sure I got the xapi version of answers.

=============================================================== From: William Roush ------------------------------------------------------ I assume you mean hypervisor. Big fan of ESXi. Management being boneheaded recently not so much. William Roush william.roush@roushtech.net 423-463-0592 http://www.roushtech.net/blog/

=============================================================== From: "Alex Smith (K4RNT)" ------------------------------------------------------ I'd be split between ESXi and VirtualBox, depending on the environment and software requirements. I haven't learned much about Xen is that, from what I remember, it requires CPU virtualization instruction support, which a lot of my hardware does not= . " ' With the first link, the chain is forged. The first speech censured, the first thought forbidden, the first freedom denied, chains us all irrevocably.' Those words were uttered by Judge Aaron Satie as wisdom and warning... The first time any man's freedom is trodden on we=E2=80=99re all damaged." - Jean-Luc Picard, quoting Judge Aaron Satie, Star Trek: TNG episode "The Drumhead" - Alex Smith - Dulles Technology Corridor (Chantilly/Ashburn/Dulles), Virginia USA On Thu, Mar 13, 2014 at 6:58 PM, William Roush wrote:

=============================================================== From: Joseph Simoneau ------------------------------------------------------ My homelab is currently on KVM, and it's alright. Compared to VMware workstation, the network setup is weirder and possibly limiting. If I were starting over today, I'd try ESXi (managed with workstation) and xen. I wouldn't rebuild with KVM because it forces some choices that seem suboptimal once things get big or odd. The big plus with KVM and Xen, as I see it, is that you can use Ceph or something like it for the datastore instead of just direct disks or a NAS/SAN that adds other complexities. -js On Mar 13, 2014 8:00 PM, "Alex Smith (K4RNT)" wrote:

=============================================================== From: Mike Smith ------------------------------------------------------ I like that Xen doesn't require a central server (XenCenter vs. vCenter), but you pay for that by increasing the mgmt burden on Xen. Been very happy with ESXi. On Thu, Mar 13, 2014 at 9:35 PM, Joseph Simoneau wrote: d are d all n

=============================================================== From: Jason Brown ------------------------------------------------------ For playing around and trying new DevOps things Vagrant + VirtualBox has been awesome. I started playing with OpenNebula, but got distracted. So far it too is pretty nice for multiple compute nodes though.

=============================================================== From: Matt Keys ------------------------------------------------------ The statement "it forces some choices that seem suboptimal once things get big or odd" has peeked my curiosity. Would you mind elaborating on that, particularly what you mean by big or odd? Regards, Matt

=============================================================== From: Joseph Simoneau ------------------------------------------------------ I've just noticed weird behaviors when you're actually using virtual networks, especially in routed mode. It almost seems like there's a firewall that I can't find a way to control and that limits access to VMs, seemingly regardless of any virtual routers you've set up. It mostly came up when I was building a small virtual NAS to test btrfs... when the VM was on a bridged adapter or host only, all was well. When I did it any other way, scanning and connecting (from the host) behaved as if there was something blocking NFS and iSCSI, but not ssh, etc., even with iptables off, regardless of virtual routers. I also could just have been missing something, but it wound up a lot more of a pain than doing the same thing with a physical L2/3 switch, which doesn't seem ideal. -js

=============================================================== From: Matt Keys ------------------------------------------------------ Maybe this will help? I have a block of WAN IPs and .. kvm

=============================================================== From: Matt Keys ------------------------------------------------------ whoops, typo'd that the lamp vm is assigned to br1 on the kvm host, 'lan' interface for pfsense. lamp vm has $wan

=============================================================== From: Jonathan Calloway ------------------------------------------------------ So you gave up on Ovirt? wrote: trouble partially due to the very poor setup of the prior IT service = provider. especially after I pushed a few updates and migrated all the VMs onto an = iSCSI SAN.

=============================================================== From: Lynn Dixon ------------------------------------------------------ Well oVirt is KVM... KVM is the hypervisor, and oVirt is just a suite of tools used to manage KVM hypervisors.

=============================================================== From: Jonathan Calloway ------------------------------------------------------ I figured I=92d get that wrong! manage KVM hypervisors. wrote: wrote: trouble partially due to the very poor setup of the prior IT service = provider. XenServer, especially after I pushed a few updates and migrated all the = VMs onto an iSCSI SAN.

=============================================================== From: Joseph Simoneau ------------------------------------------------------ Fwiw, KVM is working fine now with a similar setup (rebuilt the mobile lab last night because I couldn't sleep), so I must have just some something wrong. KVM does nave the great advantage of having several ways to manage it, many of which are scriptable. -js On Mar 15, 2014 11:31 AM, "Jonathan Calloway" wrote: