I was in the exact same situation. Had to upgraded from FC21 (4.1.4) to
CentOS 7.2 (4.2.0). Upgrade went thru fine thanks to this thread :-)

For migrating the DNA ranges, I used this link
https://blog-rcritten.rhcloud.com/?p=50 Is this fine?

Thanks.

On 10 February 2016 at 15:02, Martin Kosek <mko...@redhat.com> wrote:

> On 02/05/2016 11:35 AM, Petr Vobornik wrote:
> > On 02/04/2016 06:14 PM, Christophe TREFOIS wrote:
> >> Hi all,
> >>
> >> We are currently running a 3-replica (all are setup with the —setup-ca
> flag)
> >> cluster on Fedora 21, with FreeIPA 4.1.4.
> >>
> >> We would like to slowly upgrade to the new version and move away from
> Fedora
> >> to CentOS 7.2.
> >>
> >> We were thinking of the following:
> >>
> >> - Create 3 CentOS machines with —setup-ca flag so that our current
> cluster is 6.
> >> The first CentOS VM would then probably update the DB schema to the new
> >> FreeIPA version.
> >> - Remove the Fedora VMs 1 by 1 from the cluster using
> ipa-replica-manage del
> >> <host>
> >> - Be happy?
> >>
> >>
> >> 1. Could you please advise if this is considered the safest practise?
> >
> > More or less yes:
> >
> > 1. create First IPA 4.2 against some FreeIPA 4.1.4 with CA
> > 2. create the other two against the newly Created CentOS - will verify
> if it is
> > in a good shape
> > 3. set new renewal CRL master:
> > http://www.freeipa.org/page/Howto/Promote_CA_to_Renewal_and_CRL_Master
> > 4. Migrate DNA ranges using ipa-replica-manage tool
> >
> > if all works well, remove all servers:
> >
> > 5. remove CA repl. agreements for old servers using ipa-csreplica-manage
> del
> > 6. remove old servers data and repl. agreements using ipa-replica-manage
> del
> > 7. uninstall old servers using ipa-server-install --uninstall
> >
> >> 2. Do we have to update to intermediate versions and if so how?
> >
> > Should not be necessary.
>
> Some advise is also present in the RHEL official docs:
>
>
> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Linux_Domain_Identity_Authentication_and_Policy_Guide/upgrading.html#migrating-ipa-proc
>
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> Go to http://freeipa.org for more info on the project
>
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