Also, if I externalize DNS but leave DHCP on the MN nothing has to change in the DHCP config, except changes propagated from xcat via makedhcp, does it? As long as I specify site.nameservers=X.X.X.X as the IP of my external DNS master and update /etc/dhcpd.conf with makedhcp only the "domain-name-servers" line should change, right? I know that I need to change the MN's resolv.conf to point to the external DNS server too to make this work. Also as this<https://www.mail-archive.com/[email protected]/msg00451.html>archived list email suggests I should also make sure the TSIG key for DNS is defined in /etc/named.conf on both the MN and the external DNS server (assuming I allow DNS updates only with the xcat_key signature). Does that mean the MN still needs its named daemon running to push out updates though?
Overall, in addition to the things mentioned above, is there anything else that I have missed that will be necessary to do to make external DNS work with xCAT? Thanks, Josh On Wed, Mar 26, 2014 at 2:11 PM, Josh Nielsen <[email protected]>wrote: > Sorry to revive this, but I have a question about external DNS since I am > thinking of trying it now. > > On the Cluster Name Resolution wiki page ( > http://sourceforge.net/apps/mediawiki/xcat/index.php?title=Cluster_Name_Resolution) > under 'Option #2: Use a DNS That is Outside of the Cluster' it says: "If > you already have a DNS on your site network and you want to use that for > your cluster node names too, you can point all of the nodes to it. You must > ensure that your nodes have IP connectivity to the DNS, and you must > manually configure your DNS with the node hostnames and IP addresses." > > What does it mean that "you must manually configure" the hostnames and IP > addresses? Does 'makedns -e' not do that for you, just like it would if DNS > were running locally on the MN itself by just parsing /etc/hosts and > adding/pushing it to the (remote) DNS zone files for you? > > In my case I may even be migrating my existing DNS zone files and > "/etc/named.conf" config onto a new VM and bring up DNS there and just add > any new hosts. But I would be surprised if makedns -e doesn't add the > hostnames and IPs for you. Can anyone who has used the external DNS option > with xCAT speak to that? > > Thanks, > Josh > > > On Thu, Jan 16, 2014 at 5:13 PM, Christopher Samuel <[email protected] > > wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> On 17/01/14 04:00, Josh Nielsen wrote: >> >> > If it just something with our installation or does makedns do this >> > foe other people as well? >> >> FWIW we do not run DNS on the management nodes at all, we have 4 >> separate xCAT built clusters (3 HPC clusters and 1 for our GPFS/TSM >> infrastructure and our BG/Q service and front ends) and so to let them >> all populate DNS with a single, consistent view we have two external >> DNS servers that they all send updates to with "makedns -e". >> >> One kink I think we've noticed there is that even with makedns -e xCAT >> seems to start up bind on the local system which isn't what we want at >> all. >> >> Good luck! >> Chris >> - -- >> Christopher Samuel Senior Systems Administrator >> VLSCI - Victorian Life Sciences Computation Initiative >> Email: [email protected] Phone: +61 (0)3 903 55545 >> http://www.vlsci.org.au/ http://twitter.com/vlsci >> >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1.4.14 (GNU/Linux) >> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ >> >> iEYEARECAAYFAlLYZ4sACgkQO2KABBYQAh8pwACfSEi4RePX5F2hG5E1AtrAdy77 >> PtMAni1KEwsOM/az4z0U7o4aZZOEuO/+ >> =fPWd >> -----END PGP SIGNATURE----- >> >> >> ------------------------------------------------------------------------------ >> CenturyLink Cloud: The Leader in Enterprise Cloud Services. >> Learn Why More Businesses Are Choosing CenturyLink Cloud For >> Critical Workloads, Development Environments & Everything In Between. >> Get a Quote or Start a Free Trial Today. >> >> http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk >> _______________________________________________ >> xCAT-user mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/xcat-user >> > >
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