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Hi Darren,
pleased to get notice of someone who uses the same product.
I have lots of questions ;-)
1) Do do you arrange ldirector and real cluster on the same machine?
Novell documentation do never go into detail so I believe it works.
2) How do you arrange sysctl configs (arp settings) in detail on all servers?
3) How do you arrange fail-over? via stonith ressource? how?
4) I often got the price to run into quorum (at pacemaker). How do you prevent
it?
And if the cluster crashes (unexpected shutdown) how do you restore its sync?
Best regards
Andrew
GoogleTalk: andreas.mrvka@xxxxxxxxx
-----Ursprüngliche Nachricht-----
Von: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] Im Auftrag von
Darren.Mansell@xxxxxxxxxxxx
Gesendet: Freitag, 3. Dezember 2010 12:34
An: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Betreff: Re: [lvs-users] is it possible to have ldirector and real cluster
server on same physical machine?
Hello.
We have around 20 nodes of SLES 11 HAE servers running in 2 or 3 node clusters.
All of them are configured with local resources and ldirectord to load-balance
to the local nodes with a highly available ldirectord resource being able to
move on failover.
I can give more info if required.
-----Original Message-----
From: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Mrvka Andreas
Sent: 03 December 2010 10:43
To: 'lvs-users@xxxxxxxxxxxxxxxxxxxxxx'
Subject: Re: [lvs-users] is it possible to have ldirector and real cluster
server on same physical machine?
Hi,
I've misstped the arp_announce entries. It should be 2 instead of 1.
After a reboot it looks quite good having only one ldirector.
I am satisfied at the moment.
Novell HAE (High Availability Extension) shipps pacemaker.
I will try to configure it managing ldirector service on both machines but only
be explicitly active on one node.
And in the backup-case pacemaker should switch.
This sounds clear for me. But in fact, that the sysctl.cf file differs - how
should this be updated?
Thank you very much till now.
Andrew
-----Ursprüngliche Nachricht-----
Von: Mrvka Andreas
Gesendet: Freitag, 3. Dezember 2010 11:09
An: 'lvs-users@xxxxxxxxxxxxxxxxxxxxxx'
Betreff: AW: [lvs-users] is it possible to have ldirector and real cluster
server on same physical machine?
Hello Simon,
thank you for your fast response! I am happy for every feedback.
Actually I thought I can have more than one active ldirector (for failover and
ldirector load balancing).
Well, okay let's do ldirector with one node.
I refer to your Ultramonkey Howto.
----- On my first node I run ldirector and cluster node --- eth0 is real IP and
lo:0 is virtual IP. So I do have to arp_announce on lo:0 butnot arp_ignore.
net.ipv4.conf.all.arp_announce = 1 # enable the feature
net.ipv4.conf.lo.arp_anounce = 1
----- On my second and n+1 node I run only cluster nodes --- eth0 is real IP
and lo:0 is virtual IP. So I do have to arp_ignore on lo:0 but not arp_announce.
net.ipv4.conf.all.arp_ignore = 1 # enable the feature
net.ipv4.conf.lo.arp_ignore = 1
Is this correct?
Thank for directing me into right direction.
Andrew
-----Ursprüngliche Nachricht-----
Von: Simon Horman [mailto:horms@xxxxxxxxxxxx]
Gesendet: Freitag, 3. Dezember 2010 10:39
An: Mrvka Andreas
Cc: 'lvs-users@xxxxxxxxxxxxxxxxxxxxxx'
Betreff: Re: [lvs-users] is it possible to have ldirector and real cluster
server on same physical machine?
On Fri, Dec 03, 2010 at 09:31:19AM +0100, Mrvka Andreas wrote:
> Hello list,
>
> I hope you can help me.
> I am using a simple 2 node cluster environment on SUSE Linux Enterprise
> Server 11 SP1 HAE.
>
> I only use ldiretord/ipvs and an apache service on both machines.
> My virtual IP address on interface lo:0 and real cluster IP on eth0.
>
> Regarding to the documentation of Novell it should be possible to have
> ldirectord etc. on the same machines.
> Do you agree?
>
> I ask because if I do a tcpdump I see lots of traffic from the client
> browser to the server (http port) and the tcp session will never end.
> ( client side has finished the transfer but on the server side tcpdump
> runs and runs....)
Hi Andreas,
if you want a pair of machines and you want one of them to be the active linux
director + a real server, and you want the other to be the backup-linux
director + a real server then yes it is possible, but you need to take special
care.
1. On the active linux director the VIP should be on lo and
On the backup-linux director the VIP should be on ethX
- That is, you need to move the VIP when a machine moves
from being active to backup and vice versa.
2. The backup-linux director must not have LVS rules in place for the
service being handled by the active linux director.
- That is, you need to have ldirectord running on only the active
linux director. Or in other words, you need to start it
when a machine becomes active and stop it when it becomes a backup.
3. You have to make sure that arp_ignore and arp_announce are set correctly.
Its a bit old, but I have some notes on this at
http://www.ultramonkey.org/3/topologies/sl-ha-lb-eg.html
(In relation to ARP you want the "Debian" notes unless you have a really
ancient kernel.)
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Please read the documentation before posting - it's available at:
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LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx Send
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_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx Send
requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
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