Cockpit: Fedora 27, VDO device creating not work

[serjponomarev]

I have Fedora 27 with full updates for now (pkgs, kernel etc).
Build and install VDO https://github.com/dm-vdo/ (VDO today updated and added support for Fedor 27)
VDO working, all perfect.
But when i creating VDO device in Cockpit interface, his creates, but not showing in VDO device in interface. His dropped to Other devices.
See screenshot.

What wrong?

[mvollmer]

Thanks for reporting this! I will have to try this myself.

[serjponomarev]

Marius, do you have any progress?

[mvollmer]

Marius, do you have any progress?

I'll start now. Is there a COPR with VDO rpms for F27?

[serjponomarev]

Yes, from default repo (Updates).
Cockpit version 161 and all deps.
VDO builded from sources (https://github.com/dm-vdo/)

[mvollmer]

Okay, the main issue is that Fedora 27 has python3 installed and thus Cockpit was using that to run the VDO Python code (because we require all our Python code to work with python3). However, we also use the semi-private "vdomgmt" module installed with /usr/bin/vdo, and that one exists only for python2.

There was also a small API change in vdomgmt.

8626 should fix this. Can you try it out?

[serjponomarev]

I need merge master with your changes and compile Cockpit from source? Right?

[mvollmer]

I need merge master with your changes and compile Cockpit from source? Right?

The merge is optional, but you would need to compile Cockpit from sources, yes.

I have also uploaded a pre-compiled version of just the "storage" component, with instructions:

https://github.com/mvollmer/cockpit-storage-vdo-f27

Let me know how it goes!

[serjponomarev]

Perfect! Working!
When will it be in the master branch?

[mvollmer]

When will it be in the master branch?

In a couple of days, I'd guess. There is no particular hurry IMO since vdo itself isn't in Fedora 27 yet.

[martinpitt]

@serjponomarev : The fix was released with Cockpit 162 yesterday and is in Fedora 27 testing now: https://bodhi.fedoraproject.org/updates/cockpit-162-1.fc27

[serjponomarev]

@martinpitt @mvollmer This problem has been reproduced again:
Centos 7.5
kernel 4.17.14-1.el7.elrepo.x86_64
KVDO and VDO from master branch
Cockpit version 169:
cockpit-system-169-1.el7.centos.noarch
cockpit-169-1.el7.centos.x86_64
cockpit-bridge-169-1.el7.centos.x86_64
cockpit-ws-169-1.el7.centos.x86_64
cockpit-networkmanager-169-1.el7.centos.noarch
cockpit-storaged-169-1.el7.centos.noarch

how to resolve this issue on Centos 7.5 with last VDO & KVDO from Git?

[drckeefe]

Newer version of VDO manager (6.2+) uses python 3. Centos 7.5 uses python 2. This might be the issue. Can you try using the 6.1 version of VDO manager with 6.2 version of kmod-kvdo on Centos 7.5 with the 4.17 kernel? I haven't tried it, but it might work for you.

[serjponomarev]

I already checked it.
Cockpit and VDO are working, the web console is also working.
The problem in the statistics, vdostats --si produces an error, VDOStatistics version mismatch

[mvollmer]

Cockpit and VDO are working, the web console is also working.

I would expect that Cockpit is broken just like in the original issue: One can create a VDO volume, but Cockpit will not recognize it as such.

The reason is exactly what @drckeefe has mentioned: Cockpit will try to load vdo.statistics with Python 2, but since VDO from Git now uses Python 3, this will fail.

Cockpit 172 fixes this. Can you upgrade Cockpit as well?

[serjponomarev]

in the official Centos repositories, the cockpit is only version 169 at the moment. @mvollmer can you tell me when will version 172? Thank you )

[serjponomarev]

@mvollmer please, tell me when will version 172 in repo? )