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Re: high availability referrals
Mike Jackson <firstname.lastname@example.org> writes:
> I will explain a problem below and hope that somebody here has a good
> solution about high availability of referred DIT namespace portions.
> So, you can see that a virtual tree is formed via the use of referrals.
> Everything is fine if "ldap-1" dies, since the same referral has been
> replicated to "ldap-2" and "ldap-3" and clients can query those boxes.
> What happens if "ldap-4" dies? There are two replicas of "ldap-4" waiting
> to service requests, but the referral from the top-level doesn't point to
> them. The virtual tree becomes broken and requires manual intervention to
> "fix" it, e.g. modifying the referral on "ldap-1" to point to "ldap-5"
> or to "ldap-6".
> Does somebody know of a more intelligent and automatic method of
> handling this? Replies to list and my email, please :-)
What about DNS round robin and CNAMEs?
ldap-4 IN A 10.0.0.1
ldap-5 IN A 10.0.0.2
ldap-6 IN A 10.0.0.3
ldap-4 IN CNAME ldap-5
ldap-4 IN CNAME ldap-6
If your clients support it, you could create DNS SRV Records as well.
Dieter Kluenter | Systemberatung
Tel:040.64861967 | Fax: 040.64891521