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[Xen-users] Kernel upgrade in domU

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Guilherme E.J." <guilherme.e@xxxxxxxxx>
  • Date: Tue, 16 Nov 2010 15:02:59 -0200
  • Delivery-date: Tue, 16 Nov 2010 09:05:19 -0800
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>


I administrate a lot of xen servers with some linux virtual machines (paravirtualized), and I've some operational problems (costs) to mass upgrade kernel version in domU's.

In a linux server farm (non virtualized servers), the kernel upgrade is trivial, fast and automatized. I simple schedule in my cfengine server, to run "yum update kernel -y && reboot" in all servers.

In a virtualized linux server farm, it's a hard work to upgrade kernel, when needed. First of all, I use cfengine to update kernel-xen package, but after that I've a lot of manual steps that the Operations Department runs:

- Shutdown all virtual machines of xen server X;
- Upgrade kernel and ramdisk of all instances (for example, /xen/hosts/user/i-xxxxx/kernel and /xen/hosts/user/i-xxxxx/ramdisk))
- Upgrade kernel version of dom0
- Reboot dom0

The problem is that I've almost 300 virtual servers, and when we need to upgrade kernel, operations department spend some days to do that.

My question is if this is the best approach to mass upgrade kernel or if exists some tool that I can use to speed up this process?

Any advice is welcome!!


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