Re: [xcat-user] makedns-generated zones and their NS record

Thu, 02 Nov 2017 23:05:58 -0700

Hi Kevin,
 
To add the Management Node to the DB, use command:  xcatconfig -m ;
 
And I saw questions from your mail and tried to give a way to let it work, I realize I do not know your overall requirements about hosts/DNS clearly , could you summarize your original requirements? 
 
Let us see if we can do some enhancements here.
 
 
Best Regards
--------------------------------------------------
Yuan Bai (白媛)

CSTL HPC System Management Development
Tel:86-10-82451401
E-mail: by...@cn.ibm.com
Address: IBM ZGC Campus. Ring Building 28,
ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, Haidian District,
Beijing P.R.China 100193

IBM环宇大厦
北京市海淀区东北旺西路8号，中关村软件园28号楼
邮编:100193
 
 
----- Original message -----
From: Kevin Keane <kke...@sandiego.edu>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Cc:
Subject: Re: [xcat-user] makedns-generated zones and their NS record
Date: Fri, Nov 3, 2017 12:00 AM
 
Thank you, Yuan and Christian!
 
Yuan, I haven't tried it, but it seems that your suggestion would not actually solve my problem. Makehosts would generate, as you were saying, this line:

192.168.20.2 hpcmn-test-eth1 hpcmn-test.kkeane.sandiego.edu
 
But the DNS server should only listen on 192.168.101.2. That is why I my preferred solution would be to change the zones to have an NS record that actually points to the correct NIC: hpcmn-test.imm.sabre.kkeane.sandiego.edu
 
Christian - you are right. Putting the names into the "hostnames" field was a bit of a hack. It actually works if there is only one name in that field, but if there are multiple names in that field, makehosts seems to only use the last one. And it also seems to *replace* rather than add to the names that xCAT would ordinarily use.
 
 
On Wed, Nov 1, 2017 at 7:04 PM, Yuan Y Bai <by...@cn.ibm.com> wrote:
Hi Kevin,
 
I am glad that it does work.
 
For your question about makehosts:
In your example, the short names are all 'hpcmn-test',  since 'makehsots' generate both short name and long name for one nic ip, here you need to configure nics table for eth1 and eth0,  so that, makehosts can generate different short names for all nics. and you can add specific long name in nics.nicaliases. Take eth1 and eth2 as example:
 
1, configure hosts table for mangement ip:
"hpcmn-test","192.168.101.2",,,,
 
2, configure nics table for secondary nics:
"hpcmn-test","eth1!192.168.20.2",,,,,,"eth1!hpcmn-test.kkeane.sandiego.edu",,,,,
 
3, use the same networks table with yours.
 
4, use lsdef to see hpcmn-test node definition:
]# lsdef hpcmn-test
Object name: hpcmn-test
    groups=all
    ip=192.168.101.2
    nicaliases.eth1=hpcmn-test.kkeane.sandiego.edu
    nicips.eth1=192.168.20.2
    postbootscripts=otherpkgs
    postscripts=syslog,remoteshell,syncfiles
 
5. execute 'makehosts hpcmn-test', check /etc/hosts file:
192.168.101.2 hpcmn-test hpcmn-test.imm.sabre.kkeane.sandiego.edu
192.168.20.2 hpcmn-test-eth1 hpcmn-test.kkeane.sandiego.edu
 
Here makehosts create short name hpcmn-test-eth1 which is different short name from hpcmn-test. And the long name hpcmn-test.kkeane.sandiego.edu is what your wanted. If you define hosts table otherinterfaces, it should have different short name with the node name, so you have errors.
 
I also think Christian gave your another tips to work this, Thanks Christian.
 
Best Regards
--------------------------------------------------
Yuan Bai (白媛)

CSTL HPC System Management Development
Tel:86-10-82451401
E-mail: by...@cn.ibm.com
Address: IBM ZGC Campus. Ring Building 28,
ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, Haidian District,
Beijing P.R.China 100193

IBM环宇大厦
北京市海淀区东北旺西路8号，中关村软件园28号楼
邮编:100193
 
 
----- Original message -----
From: Kevin Keane <kke...@sandiego.edu>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Cc:
Subject: Re: [xcat-user] makedns-generated zones and their NS record
Date: Thu, Nov 2, 2017 12:00 AM
 
Thank you, Yuan and Christian!
 
I have actually pretty much done what both of you had suggested, and it does work - somewhat.
 
I have the following networks:

[root@hpcmn-test ~]# tabdump networks
#netname,net,mask,mgtifname,gateway,dhcpserver,tftpserver,nameservers,ntpservers,logservers,dynamicrange,staticrange,staticrangeincrement,nodehostname,ddnsdomain,vlanid,domain,mtu,comments,disable
"hpcpublic","192.168.20.0","255.255.255.0","eth1","192.168.20.1",,,,,,,,,,,,"sabre.kkeane.sandiego.edu","1500","HPC Public Network",
"hpccompute","192.168.100.0","255.255.255.0","eth0",,"192.168.100.2","<xcatmaster>",,,,"192.168.100.200-192.168.100.229",,,"/z/-compute/",,,"compute.sabre.kkeane.sandiego.edu","1500","HPC Compute Network",
"hpcmanagement","192.168.101.0","255.255.255.0","eth2","<xcatmaster>","192.168.101.2","<xcatmaster>",,,,"192.168.101.200-192.168.101.229",,,"/z/-imm/",,,"imm.sabre.kkeane.sandiego.edu","1500","HPC Management Network",
 
I also have defined hpcmn-test as a node (thanks, Christian, for the tip about unmanaged!):

Object name: hpcmn-test
    groups=all
    hostnames=hpcmn-test.kkeane.sandiego.edu hpcmn-test.imm.sabre.kkeane.sandiego.edu
    ip=192.168.101.2
    postbootscripts=otherpkgs
    postscripts=syslog,remoteshell,syncfiles
 
When I manually edit /etc/hosts as Yuan suggested, everything does work:
 
127.0.0.1 localhost
192.168.101.2 hpcmn-test hpcmn-test.imm.sabre.kkeane.sandiego.edu hpcmn-test.kkeane.sandiego.edu.
 
But there are two problems with this:
 
- hpcmn-test.kkeane.sandiego.edu really should be associated with the public IP (192.168.20.2 in my example)
- makehosts does not honor this name, even though it is in the node's hostnames attribute. Here is what makehosts produces:

127.0.0.1 localhost
192.168.101.2 hpcmn-test hpcmn-test.imm.sabre.kkeane.sandiego.edu 
 
 
On Wed, Nov 1, 2017 at 7:00 AM, Christian Caruthers <ccaruth...@lenovo.com> wrote:

I just had to deal with a similar issue. Try the following:

 

-          Fill out each network in the networks table, including domain name. Don’t worry about nameservers or gateway unless there is are external resources that should be used. NOTE defining an external nameserver in networks table will cause makedns to ignore any IPs in that subnet.

-          Define hpcmn-test as an unmanaged node in the cluster (nodeadd hpcmn-test groups=__Unmanaged or something similar)

-          Define its primary interface (the one whose domain matches site.domain value) in hosts.node/hosts.ip (this should also be what was deinfed in nodelist above)

-          Define all other interfaces in hosts.otherinterfaces with fqdn. For example:
“hpcmn-test”,”1.2.3.4”,,”hpctest.compute.sabre.kkeane.sandiego.edu:2.3.4.5,hpcmn-test.imm.sabre.kkeane.sandiego.edu:3.4.5.6”,,,,
The domain names listed for each IP in hosts should match the networks.domain entry for each respective subnet.

 

Regards,
Christian Caruthers
Lenovo Professional Services

Mobile: 757-289-9872

 

From: Kevin Keane [mailto:kke...@sandiego.edu]
Sent: Tuesday, October 31, 2017 4:21 PM
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Subject: [xcat-user] makedns-generated zones and their NS record

 

I have a management node with three NICs, and want to use makedns to generate the DNS configuration.

My management node has three names, corresponding to the three NICs:

eth0: hpcmn-test.compute.sabre.kkeane.sandiego.edu
eth1: hpcmn-test.kkeane.sandiego.edu
eth2: hpcmn-test.imm.sabre.kkeane.sandiego.edu

 

hostname -f returns hpcmn-test.kkeane.sandiego.edu (which is name by which my management node will be known on our public network).

 

I have the DNS server listening only on eth2. Consequently, the zones in the DNS server should have the corresponding name server hpcmn-test.imm.sabre.kkeane.sandiego.edu. However, the zones generated by makedns -n instead use the hpcmn-test.kkeane.sandiego.edu name.

$TTL 86400
@ IN SOA hpcmn-test.kkeane.sandiego.edu. root.hpcmn-test.kkeane.sandiego.edu. ( 2017103100 10800 3600 604800 86400 )
  IN NS  hpcmn-test.kkeane.sandiego.edu.

This wreaks havoc with future calls to makedns; updates will time out because the DNS server is not listening at the IP address that corresponds to this name (and in fact, makehosts doesn't even put this name into /etc/hosts)

How can I get makedns to generate zones with an NS record that points to hpcmn-test.imm.sabre.kkeane.sandiego.edu ?

 

Thanks!

 

--

_______________________________________________________________________
Kevin Keane | Systems Architect | University of San Diego ITS | kke...@sandiego.edu
Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | 619.260.6859

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Kevin Keane | Systems Architect | University of San Diego ITS | kke...@sandiego.edu
Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | 619.260.6859

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_______________________________________________________________________
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Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | 619.260.6859

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