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Just out of interest I looked at the "Acknowledgements" for "Linux
Enterprise Cluster" by Karl Kooper. The second incriminant was "Horman".
That is some notoriety! As I participate more in this list, I am sure I
will come across more names.
BTW, it is an excellent book and I strongly recocmmend it to everyone!
Ranga Nathan wrote:
Horms wrote:
Ranga Nathan <kairanga@xxxxxxx> wrote:
Horms wrote:
Ranga Nathan <kairanga@xxxxxxx> wrote:
Karl Kopper's Linux Enterprise Cluster talks about the
availability of a kernel patch to failback from the backup to the
master that keeps the connections alive.
I could not find it on the linuxvirtualserver.org site. I see the
latest versions but they are in source format. Somehow I am unable
to do rpm --rebuild <sourcerpm>
The current version I have is: ipvsadm v1.24 2003/06/07 (compiled
with getopt_long and IPVS v1.2.0)
Could you be a little more specific about the patch
(or at least give a page refernce in the book).
It is the NOTE at the bottom of p276 (Stateful Failover of the IPVS
Table)
I am suspecting that this patch is no longer needed.
When it fails over, the connections are retained. When it fails
back, the connections are broken.
I simulated this by rebooting (this is my lab machine!) the directors.
Ok, I'm still a little confused, but I think what he is talking
about is being able to run the master and backup daemons on
both linux-directors at the same time. That patch was merged
into the kernel a while ago now, and the chances are that
you can do this without patching. To test, try running:
ipvsadm --start-daemon master
ipvsadm --start-daemon backup
I am sorry, I did not explain very well. My language is not very
technical :-) I did what you suggested before. From master to backup
the failover worked fine. I did not lose any connections. From backup,
when the master (after a reboot) snatched back the nodes, the
connections dropped. I am sure that when the master came backup, it
started the daemon, as I had "--start-daemon master" in the
/etc/ipvsadm.rules. I confirmed this by doing "ipvsadm --start-daemon
master" on the master and it said "Daemon has already run". I could
not query if it is in "master" status. I presumed so.
I there a way for the master and backup swap dynamically when
snatching the nodes?
Which if it works, will improve things somewhat.
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