[Freeipa-users] Specifying load balancing to SSSD clients

Tue Aug 21 07:46:44 UTC 2012

> > Thanks Simo,
> > 
> > I was hoping for an alternative to the DNS _srv_ records due to the 
> > Windows guys having exclusive use of those records (for now).
> > 
> > Is it feasible for IPA communications to be "force" round robined 
> > between two or more servers that are replicas of each other?  If
> > it's a possibility, I will raise a ticket.
> 
> The easiest solution for now is to configure your clients by 
> using the primary and backup options in SSSD, and just 
> configure clients to have different orders, so that they will 
> attach to separate servers by default.
> 
> Ie client 1 has primary serves of "ipa1, ipa2", while client 
> 2 has "ipa2, ipa1", and so on.
> 
> Without control of name resolution on the server side at the 
> moment we do not have other ways to do load balancing.
> 
> Simo.
> 

That's exactly my strategy for now.  Will be doing it randomly via
script, so hopefully I won't end up with all the "noisy" servers hitting
ipa1, for example!

It'll do for now though.

Duncan

> 
> > Thanks
> > 
> > Duncan Innes | Linux Architect
> > 
> >  
> > 
> > > -----Original Message-----
> > > From: Simo Sorce [mailto:ssorce at redhat.com]
> > > Sent: 21 August 2012 08:04
> > > To: Innes, Duncan
> > > Cc: freeipa-users at redhat.com
> > > Subject: Re: [Freeipa-users] Specifying load balancing to SSSD 
> > > clients
> > > 
> > > ----- Original Message -----
> > > > OK - thanks.
> > > >  
> > > > But is there any way IPA can be tweaked to do this without an 
> > > > "external"
> > > > product (albeit a Red Hat one)?  Is it possible for the
> > > sssd clients
> > > > to round-robin their requests between 2 or more servers?
> > > 
> > > At the monment only by using _srv_ records you could do some 
> > > round-robin (assuming DNS supports it).
> > > 
> > > Please do not use the load balancer as suggest in a 
> previous reply, 
> > > also using a A record would not work as machines joined 
> to IPa need 
> > > the 'correct' serve name to be able to perform GSSAPI 
> > > authentication. A round-robin A record would make that fail. A 
> > > round-robin CNAME record might work if your DNS server supports 
> > > something like that.
> > > 
> > > > Is this an sssd question or generic enough to be in this list?
> > > 
> > > It's both, SSSD implements the client, but in FreeIPA domains we 
> > > need a joint solution due to Kerberos requirements for DNS names.
> > > 
> > > > Would this functionallity be of use to freeIPA in general?
> > > (my view =
> > > > yes)
> > > 
> > > Yes.
> > > 
> > > HTH,
> > > Simo.
> > >  
> > > > Cheers
> > > >  
> > > > Duncan Innes | Linux Architect
> > > > 
> > > > 
> > > > 
> > > > ________________________________
> > > > 
> > > > 	From: Mark St. Laurent [mailto:mstlaure at redhat.com]
> > > > 	Sent: 20 August 2012 15:15
> > > > 	To: Innes, Duncan
> > > > 	Cc: freeipa-users at redhat.com
> > > > 	Subject: Re: [Freeipa-users] Specifying load 
> balancing to SSSD 
> > > > clients
> > > > 	
> > > > 	
> > > > 	
> > > > 
> > > 
> http://www.redhat.com/products/enterprise-linux-add-ons/load-balanci
> > > ng
> > > > /
> > > > 	
> > > > 	
> > > > 	Norman "Mark" St. Laurent
> > > > 	Federal Team: Senior Solutions Architect
> > > > 	Red Hat
> > > > 	8260 Greensboro Drive, Suite 300
> > > > 	McLean VA, 22102
> > > > 	Email:  msl at redhat.com
> > > > 	Cell:  703.772.1434
> > > > 	
> > > > 	Check this Link out!!!  Cool Stuff:  http://mil-oss.org/
> > > > 	
> > > > 	
> > > > ________________________________
> > > > 
> > > > 	From: "Duncan Innes" <Duncan.Innes at virginmoney.com>
> > > > 	To: freeipa-users at redhat.com
> > > > 	Sent: Monday, August 20, 2012 9:48:30 AM
> > > > 	Subject: [Freeipa-users] Specifying load balancing to
> > > SSSD clients
> > > > 	
> > > > 	Folks,
> > > > 	
> > > > 	Hopefully this isn't a dumb question, but I'm
> > > constrained by a few
> > > > 	things on my estate and would be looking to deploy
> > > something like the
> > > > 	following:
> > > > 	
> > > > 	2 Datacentres
> > > > 	2 IPA servers at each datacentre
> > > > 	
> > > > 	ipa1.domain.com \_ datacentre A
> > > > 	ipa2.domain.com /
> > > > 	
> > > > 	ipa3.domain.com \_ datacentre B
> > > > 	ipa4.domain.com /
> > > > 	
> > > > 	The datacentres are linekd, but bandwidth not great.
> > > > 	
> > > > 	Client's in datacentre A should therefore use
> > > ipa1.domain.com and
> > > > 	ipa2.domain.com as primary servers and only 
> fail over to ipa3 &
> > > > ipa4
> > > > 	when both 1 & 2 are out of action.  Clients would
> > > revert to using
> > > > 	ipa1/ipa2 whenever either of them came back online.
> > > > 	
> > > > 	I understand this configuration has already 
> been done as part of
> > > > 	https://fedorahosted.org/freeipa/ticket/2282
> > > > 	
> > > > 	What I'm wondering is if I can force my clients 
> to load balance
> > > > 	communication between ipa1 & ipa2.
> > > > 	
> > > > 	I don't have the ability to use the _srv_ records in
> > > DNS as that's
> > > > set
> > > > 	up for the AD servers on our network.  I also can't
> > > create separate
> > > > DNS
> > > > 	servers for the Linux estate (not that I'd particularly
> > > want to).
> > > > 	
> > > > 	Is there any current configuration that I can 
> use to force load
> > > > 	balancing between ipa1/ipa2 under ideal conditions.
> > > Falling back to
> > > > 	ipa2 when ipa1 is out of action.  Falling back 
> to (load balanced
> > > > 	perhaps?) ipa3/ipa4 when ipa1 & ipa2 are both 
> out of action.
> > > > 	
> > > > 	Hope the description is reasonable.
> > > > 	
> > > > 	Thanks
> > > > 	
> > > > 	Duncan Innes | Linux Architect
> > > > 	
> > > > 
> > > > 
> > > > 

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