Update wireguard installation instructions for RHEL7/8-Centos8Stream

Update wireguard installation instructions for RHEL7/8-Centos8Stream

[Faustin Lammler]

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Hi!
I am wondering if the installation instruction page [1] should not be
updated to reflect [2] ?

After upgrading a Centos 8 Stream machine, it took me some time to
understand why I was not able to load the wireguard module for the new
kernel (I had to rollback from 4.18.0-394 to 4.18.0-348).

Cheers!

-- 
Faustin

[1]: https://www.wireguard.com/install/#red-hat-enterprise-linux-8-module-kmod-module-dkms-tools
[2]: https://git.zx2c4.com/wireguard-linux-compat/commit/?id=3d3c92b4711b42169137b2ddf42ed4382e2babdf


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Re: Update wireguard installation instructions for RHEL7/8-Centos8Stream

[Faustin Lammler]

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Hi Shen!

Shen Red <darkranger_red@hotmail.com>,
12/07/2022 – 06:31:47 (+0000):

> I think that the wireguard-linux-compat project doesn't officially
> drop CentOS 8 Stream support. The recent commit message just indicates
> that is no longer guaranteed to work, and it doesn't introduce any
> code changes that actually break the compatibility.

My understanding of the commit message and above all of [1] is that the
CI was disabled for C8S and IMO that should be mentioned in the
installation instruction since there is no more guarantee that wireguard
module will install successfully on recent C8S kernel (and that's the
case with 4.18.0-394).

> The recent breakage is caused by a code change in kernel 4.18.0-394
> instead. And that change could also be committed to RHEL8 eventually.

Yes exact.

> There is no proper instruction for C8S for now. The current workaround
> is do not update the kernel to 4.18.0-394. Or, if the kernel has been
> updated, try to build the wireguard module explicitly for the older
> kernel.

This is the kind of thing that I believe should be visible on the
installation instructions, it will save a lot of time to everyone...

[1]: https://lists.zx2c4.com/pipermail/wireguard/2022-June/007664.html

-- 
Faustin

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Re: Update wireguard installation instructions for RHEL7/8-Centos8Stream

[Shen Red]

I think that the wireguard-linux-compat project doesn't officially drop CentOS 8 Stream support. The recent commit message just indicates that is no longer guaranteed to work, and it doesn't introduce any code changes that actually break the compatibility. The recent breakage is caused by a code change in kernel 4.18.0-394 instead. And that change could also be committed to RHEL8 eventually.

There is no proper instruction for C8S for now. The current workaround is do not update the kernel to 4.18.0-394. Or, if the kernel has been updated, try to build the wireguard module explicitly for the older kernel.