> On 18 May 2018, at 18:46, James Ralston <rals...@pobox.com> wrote:
> 
> We have a small development Active Directory domain where we have
> several RHEL7 hosts.
> 
> We never extended our AD schema with the RFC2307 attributes
> (uidNumber, gidNumber, et. al.).  Instead, we just configured sssd
> with ldap_id_mapping = true.  It works fantastically well!
> 
> BUT: now we need to add several RHEL5 hosts to the domain.
> 
> The problem is that the RHEL5 version of sssd is 1.5.1, which is too
> old to support ldap_id_mapping.
> 
> We looked briefly at what would be required to backport a more recent
> version of sssd to RHEL5, and quickly abandoned that idea: we would
> have to update multiple core system libraries to more recent versions
> as well.
> 
> But we don't want to have to manually manage all accounts on the RHEL5
> hosts.  That would be extraordinarily tedious and error-prone.
> 
> We've kicked around a few ideas:
> 
> 1.  Add the RFC2307 attributes to Active Directory.  Set the
> (uidNumber, gidNumber) attributes by logging in to one of the RHEL7
> hosts and observing what values sssd has mapped.
> 
> 2.  On one of our RHEL7 hosts, create a list of passwd/group entries
> for users/groups we care about, and then distribute that list of
> users/groups to the RHEL5 hosts.
> 
> We're leaning towards #1, because while it adds an additional step for
> user/group creations in AD, it keeps all account management in AD, and
> seems like the solution with the least amount of overhead.  (Only a
> handful of people need to be able to login to the RHEL5 systems, so we
> could probably get away with only creating the (uidNumber, gidNumber)
> attributes for the users/groups which need to be visible on those
> systems.
> 
> Does anyone have any other suggestions on how to wrangle both RHEL5
> and RHEL7 hosts with sssd?

Two other ideas: 
 - SSSD 1.15 should work on RHEL-5 (although I haven’t tried that in a long 
time) albeit with some functionality, including the sssd-ad provider configured 
out. What you could use though is the ldap id_provider with id-mapping manually 
enabled. You would have to set the domain SID manually at least.

 - As long as you don’t care about the IDs being the same on RHEL-5 and RHEL-7 
machines, maybe you could use winbind?

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