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Re: change hostname & static IP & ???

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On 04/12/2016 03:27 AM, tomas@tuxteam.de wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Mon, Apr 11, 2016 at 08:31:16PM -0500, David Wright wrote:
>> On Mon 11 Apr 2016 at 19:02:45 (-0400), ken wrote:
>>> This is on Wheezy for a Raspberry Pi.
>>>
>>> Using dd, I copied the SD card for one (nicely working and
>>> configured) system onto another SD card [...]
>> .ssh/known_hosts [...]
> Also, your new host will have the same ssh host private key. This
> might or might not annoy you.

You mean those /etc/ssh/ssh_host_*key* files, yes?


> Another thing to look out for:
>
> Bits and pieces of your /etc might end up in your initramfs,
> namely those needed in early boot (e.g. things needed to
> bring up the root file system). The static IP address might
> be needed if you have your root on NFS, for example. Or
> the /etc/crypttab, if you're running with encrypted root
> (I don't think so, but I lost myself some hair over this
> one).
>
> So after you have "fixed up" your SD card clone (IPs and all
> that things) you might want to run update-initramfs for those
> bits to find their way into the initramfs.

Thanks for letting me know.  Though I've set up a few encrypted file 
systems and compiled lots of kernels in the past, still I'm a 
feets-pointing-backwards idiot when it comes to initramfs, never needed 
to know much about it,

It sounds like "update-initramfs -v -u all" should be the last thing I 
do before the initial reboot, yes?


> Beware that now you have two different file systems with
> the same UUID. This might confuse some all too credulous
> programs that rely on (re-) seeing the same medium if the
> UUID didn't change.

Very good to know... and I didn't know that at all.  A quick look around 
found me dbus-uuidgen, a command to create a new uuid.  It's stored in 
/var/lib/dbus/machine-id says the manpage... and confirmed.  Is that the 
UUID you're referring to?

The manpage makes this one seem easy...

cd [the SD card's / mount point]
dbus-uuidgen > var/lib/dbus/machine-id


There are also things called UUIDs, or 'labels', for devices and for 
partitions and for swap(s).  Do I need to do something with them as well?

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Thread

change hostname & static IP & ??? ken <gebser@mousecar.com> - 2016-04-12 01:10 +0200
  Re: change hostname & static IP & ??? David Wright <deblis@lionunicorn.co.uk> - 2016-04-12 03:40 +0200
    Re: change hostname & static IP & ??? <tomas@tuxteam.de> - 2016-04-12 09:30 +0200
      Re: change hostname & static IP & ??? ken <gebser@mousecar.com> - 2016-04-12 23:30 +0200
        Re: change hostname & static IP & ??? David Wright <deblis@lionunicorn.co.uk> - 2016-04-13 02:40 +0200
        Re: change hostname & static IP & ??? <tomas@tuxteam.de> - 2016-04-13 09:50 +0200
    Clone SD card for new system <- Re: change hostname & static IP & ??? ken <gebser@mousecar.com> - 2016-04-12 16:30 +0200
      Re: Clone SD card for new system <- Re: change hostname & static IP  & ??? David Wright <deblis@lionunicorn.co.uk> - 2016-04-13 02:10 +0200
  Re: [Raspbian-devel] change hostname & static IP & ??? Stian Skjelstad <stian@barnfind.no> - 2016-04-12 09:40 +0200

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