Posts made by JeffBerntsen

@danp said in XO created snapshots are too visible:

I seem to recall this issue coming up previously. I think non-XO snapshots are flagged as templates to that they aren't included in the VM list.

Yes, I just found it here, https://xcp-ng.org/forum/topic/2718/xcp-ng-center-20-03-00-released/ , in the discussion between you, @hvilches , and @olivierlambert

It looks like it's not just XCP-ng Center / XenCenter that create snapshots with the is-a-template parameter set true. The xe CLI does as well when creating a snapshot with the xe vm-snapshot command and some xe commands like xe vm-list show the snapshots with is-a-template set false but not the ones with is-a-template set true. xe snapshot-list shows both types but allows you to select just one or the other with is-a-template=true (or false). xe template-list doesn't seem to allow showing the snapshots by trying to select using is-a-snapshot=true though the parameter is accepted and not flagged as an error.

Odd behavior all around. I only noticed it because I have scripts that parse through the vm-list output and end up catching XO snapshots but not others in the process.

I was originally thinking this might be a bug in XO but maybe it's actually a problem in the xe vm-list command or XAPI in general, i.e. a list of VMs shouldn't list snapshots the way it already doesn't list templates.

Now that I'm starting to test XCP-ng 8.2 in my environment, I'm starting to use XO a lot more as part of my testing and noticed an odd thing with snapshots created by XO.

Snapshots created by XO are showing up in the "All VMs" list in xsconsole as though they are VMs which haven't been started while VM snapshots created by other means such as XenCenter, XCP-ng Center, and xe CLI vm-snapshot commands don't. The snapshots created by XO are also showing up in the xe vm-list output while the others don't; I suspect this list is what xsconsole is fetching for its "All VMs" list.

I've compared parameters for the snapshots created by all three methods and the only thing that stands out is that the visible vs. invisible snapshots have different is-a-template parameters. CLI and XCP-ng Center snapshots have both is-a-snapshot and is-a-template set to true while XO snapshots have is-a-snapshot set to true and is-a-template set to false.

I've tested this with both a recent XOA and XO built from source and see the same problem with both. It also doesn't seem to matter which version of XCP-ng or XenServer I'm running it on; I've seen exactly the same problem with both XCP-ng 8.2 and XenServer 7.1.

Have I found a bug or is this expected, normal operation for XO?

@stormi Updated my 8.0 test server and all seems to be working just fine so far.

@stormi I seem to remember running across a similar problem on a RHEL system. Since XCP-ng is based on Centos which is pretty much the same thing, could it be related to this: https://bugzilla.redhat.com/show_bug.cgi?id=1663267

@stormi Yup, I did just before trying to install the test update so I must have gotten it after you published. Everything seems to be working fine here afterward.

@stormi I tried insalling the 8.0 update with the command you have listed but nothing installs on the server

 yum update xen-dom0-libs xen-dom0-tools xen-hypervisor xen-libs xen-tools --enablerepo=xcp-ng-testing
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Excluding mirror: updates.xcp-ng.org
 * xcp-ng-base: mirrors.xcp-ng.org
Excluding mirror: updates.xcp-ng.org
 * xcp-ng-testing: mirrors.xcp-ng.org
Excluding mirror: updates.xcp-ng.org
 * xcp-ng-updates: mirrors.xcp-ng.org
No packages marked for update

Hopefully, you'll be able to keep some of the features they're deprecating like the vswitch controller.

@Marc-pezin

This is fantastic news! Thanks for sharing it. Olivier mentioned that something might be in the works but didn't mention much more than that.

I've used DRBD on various projects in the past and been nothing but impressed by it. It would be interesting to see if you could reach out to the folks behind HA-Lizard as well; they've got a lot of experience with DRBD on Xen systems.

@olivierlambert

Any thought on how much of it Citrix may be trying to make closed-source to throw a wrench in the spokes for XCP-ng?

I know they've announced a session at Synergy just to talk about it so I'm pretty sure it'll be out before then but I hadn't heard anything about sometime in the next couple of weeks.

@r1 I think that config option is to enable pNFS server support, not the client. I'm pretty sure this being disabled just means that XCP-ng can't be used as a pNFS server (though a VM running on it certainly could).

@atmurphy, I haven't tried it, but there are a set of plugins available for Xencenter that might work under XCP-ng Center that adds an auto-start option. See https://www.citrix.com/blogs/2018/03/14/xenserver-plugins-collection-v6/