In xCAT's perspective that the IP for the nodes will be predefined in the
ip attributes (hosts table), when you run makehosts, the ip/hostname
mapping will be added in /etc/hosts. Then when you run makedns, this
ip/hostname mapping will be pushed to dns server. And after run makedhcp,
the 'fixed-address' will be added to dhcpd.leases file.
Thanks
Best Regards
----------------------------------------------------------------------
Wang Xiaopeng (王晓朋)
IBM China System Technology Laboratory
Tel: 86-10-82453455
Email: [email protected]
Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road,
Haidian District Beijing P.R.China 100193
From: Josh Nielsen <[email protected]>
To: xCAT Users Mailing list <[email protected]>
Date: 2015/03/04 05:50
Subject: [xcat-user] Service Node trying to update Master DNS
Hello all,
I have one xCAT MN and two SNs along with an external DNS server that they
all interact with. The SNs act as slave DNS servers that only sync down
changes made to the external (master) DNS server that is updated by
commands like 'makedns -e' from the MN only.
An issue I am running into, that I haven't tried since I moved to the MN/SN
hierarchy model, is that during a PXE deploy the new node gets a DHCP IP
from one of the SNs and then that SN tries to add the node's IP to the
external DNS server and can't. The SNs are not authorized to update the DNS
entries since it is a "readonly" slave that just syncs what it sees on the
master external DNS server. I can manually alter their named.conf to allow
updates to be pushed up from the slave named servers on the SNs, but I
wanted to check and see what others are doing for this issue first and
whether you allow your SNs DNS slaves update the master DNS. Perhaps I
configured something incorrectly to begin with.
One thing I do need to figure out though is why the node's entry
in /var/lib/dhcpd/dhcpd.leases is saying " dynamic" though instead of
"fixed-address" and doesn't list the IP that shows for the node's config
with an lsdef. Perhaps that is why the makedns -e doesn't seem to help,
because it picks a different IP then tries to add it. Either way the SNs
don't have permission to update DNS.
Thanks,
Josh Nielsen
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conversation now. http://goparallel.sourceforge.net/
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