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Subject: Re: [PATCH 0/3] Enable the setting of a kernel module parameter from
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To:     "bfields@fieldses.org" <bfields@fieldses.org>,
        Trond Myklebust <trondmy@hammerspace.com>
Cc:     "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "ajmitchell@redhat.com" <ajmitchell@redhat.com>,
        "chuck.lever@oracle.com" <chuck.lever@oracle.com>
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 <20210420181627.GA7297@fieldses.org>
From:   Steve Dickson <SteveD@RedHat.com>
Message-ID: <ed3c0acc-aeab-bd9f-69d4-82b2fed5d949@RedHat.com>
Date:   Tue, 20 Apr 2021 15:30:03 -0400
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On 4/20/21 2:16 PM, bfields@fieldses.org wrote:
> On Tue, Apr 20, 2021 at 05:53:34PM +0000, Trond Myklebust wrote:
>> So if the machine-id exists, then maybe we could indeed generate the
>> identity using the uuid in that file (although the question remains as
>> to why you'd want that?).
> 
> I was assuming: When you clone a machine image, either you want the
> clone to have the same identity (maybe it's a backup, or you're doing
> some sort of migration) or you want it to act like a new machine (say
> you've got a base image that you're using to make a bunch of hosts).  In
> the latter case you've got to track down everything on the filesystem
> that needs to differ between hosts and fix it up.  The fewer of those,
> the better.
For the record... I cloned a VM and the /etc/machine-id were the same.
The later would have to happen. 

> 
>> However the generated value should then be persisted separately so
>> that it can be platform independent.
> 
> That'd be OK.
> 
> I don't think switching a host between systemd and not systemd-based is
> a common case.
> 
> If somebody has a really weird case they can always write their own
> script.
+1 

steved.