How can I have the same ssh key for dual boot (ssh-keygen)

Philip Hands phil at
Wed Apr 2 21:20:53 EST 2014

Nico Kadel-Garcia <nkadel at> writes:

> On Tue, Apr 1, 2014 at 4:48 AM, Philip Hands <phil at> wrote:
>> Kevin Wilson <wkevils at> writes:
>>> I use:
>>> ssh-keygen -t rsa
>>> to generate a key file ( which I copy into authorized_keys2 on
>>> other machines in order to permit ssh to these machines without being
>>> asked for a password.
>>> The thing is that I have dual boot on this machine: one for fedora and
>>> one for ubuntu. The two key files which were generated on these machine
>>> are different.
>>> Is there a way so that I will have the same key file for both these fedora
>>> and
>>> ubuntu ?
>> As mentioned by others, there is a way to do this, but I'd suggest that
>> you shouldn't want to.
>> What's wrong with having an additional key in the authorized_keys file?
> It's not an "additoinal" key. It's a mismatched key for the same
> hostname in DNS and the same IP address. This causes every SSH client
> on the planet to complain about the mismatch, unless you've
> specifically disabled that check in your client configuration. And
> there is *no* tool besides a text editor for updating such changed
> records in the UNIX/Linux client text based client world besides a
> text editor.

The original question was about client authentication keys, not host
keys, unless I misunderstood the bit about:

  I use:
  ssh-keygen -t rsa
  to generate a key file ( ...

Cheers, Phil.
|)|  Philip Hands [+44 (0)20 8530 9560]
|-|  HANDS.COM Ltd.          
|(|  10 Onslow Gardens, South Woodford, London  E18 1NE  ENGLAND
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