xCAT / Bugs / #3961 makedns -n failed on Ubuntu 13.10

Jing Sun - 2014-01-14

labels: --> dns
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Jing Sun - 2014-01-14

This bug is caused by the upgrade of package libnet-dns-perl, on ubuntu 12.04, its version is 0.66-2ubuntu3, while on ubuntu 13.10, it's 0.68-1.2.

The implementation is different for "sub new() " in /usr/lib/perl5/Net/DNS/Question.pm:

In 0.68-1.2:
$self->{name} = new Net::DNS::DomainName1035($qname);
$self->{type} = Net::DNS::typesbyname( $qtype || 'A' );
$self->{class} = Net::DNS::classesbyname( $qclass || 'IN' );

In 0.66-2ubuntu3:
$self->{qname} = $qname;
$self->{qtype} = ( $qtype || 'A' );
$self->{qclass} = ( $qclass || 'IN' );

So for the same xcat calls, ubuntu 13.10 reports the stack:

unexpected null domain label at /usr/lib/perl5/Net/DNS/Question.pm line 81
at /usr/lib/perl5/Net/DNS/Domain.pm line 106
Net::DNS::Domain::new('Net::DNS::DomainName1035', '.ppd.pok.ibm.com.') called at /usr/lib/perl5/Net/DNS/Question.pm line 81
Net::DNS::Question::new('Net::DNS::Question', '.ppd.pok.ibm.com.', 'NS') called at /usr/lib/perl5/Net/DNS/Packet.pm line 90
Net::DNS::Packet::new('Net::DNS::Packet', '.ppd.pok.ibm.com.', 'NS') called at /usr/lib/perl5/Net/DNS/Resolver/Base.pm line 1094
Net::DNS::Resolver::Base::make_query_packet('Net::DNS::Resolver=HASH(0x9f3faf8)', '.ppd.pok.ibm.com.', 'NS') called at /usr/lib/perl5/Net/DNS/Resolver/Base.pm line 487
Net::DNS::Resolver::Base::send('Net::DNS::Resolver=HASH(0x9f3faf8)', '.ppd.pok.ibm.com.', 'NS') called at /usr/lib/perl5/Net/DNS/Resolver/Base.pm line 478
Net::DNS::Resolver::Base::query('Net::DNS::Resolver=HASH(0x9f3faf8)', '.ppd.pok.ibm.com.', 'NS') called at /opt/xcat/lib/perl/xCAT_plugin/ddns.pm line 1239
xCAT_plugin::ddns::find_nameserver_for_dns('HASH(0x27f9e10)', '.ppd.pok.ibm.com.') called at /opt/xcat/lib/perl/xCAT_plugin/ddns.pm line 1134
xCAT_plugin::ddns::add_or_delete_records('HASH(0x27f9e10)') called at /opt/xcat/lib/perl/xCAT_plugin/ddns.pm line 681
xCAT_plugin::ddns::process_request('HASH(0x926be0)', 'CODE(0x1052b60)', 'CODE(0x103e650)') called at /opt/xcat/lib/perl/xCAT/Client.pm line 800
xCAT::Client::dispatch_request('HASH(0x926be0)', 'CODE(0x1052b60)', 'ddns') called at /opt/xcat/lib/perl/xCAT/Client.pm line 676
xCAT::Client::plugin_command('HASH(0x926be0)', undef, 'CODE(0x1052b60)') called at /opt/xcat/lib/perl/xCAT/Client.pm line 192
xCAT::Client::submit_request('HASH(0x926be0)', 'CODE(0x1052b60)') called at /opt/xcat/sbin/makedns line 101

I think this should be a ubuntu bug, but since 13.10 is not a LTS, could you use the latest libnet-dns-perl and have a try? If it can work with the latest version, then we can document this as a known issue and provide the users a workaround.
Thx.

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Le Yin - 2014-01-15

I tested 0.66 version on 13.10, it works.

root@c111bc2n12:/home# dpkg -i libnet-dns-perl_0.66-2ubuntu3_amd64.deb
dpkg: warning: downgrading libnet-dns-perl from 0.68-1.2 to 0.66-2ubuntu3
(Reading database ... 70033 files and directories currently installed.)
Preparing to replace libnet-dns-perl 0.68-1.2 (using libnet-dns-perl_0.66-2ubuntu3_amd64.deb) ...
Unpacking replacement libnet-dns-perl ...
Setting up libnet-dns-perl (0.66-2ubuntu3) ...
Processing triggers for man-db ...

root@c111bc2n12:/home# dpkg -l |grep libnet-dns-perl
ii libnet-dns-perl 0.66-2ubuntu3 amd64 Perform DNS queries from a Perl script

root@c111bc2n12:/home# makedns -n
Handling c111bc2n12 in /etc/hosts.
Handling c111bc2n10 in /etc/hosts.
Handling c111bc2n09 in /etc/hosts.
Handling localhost.localdomain in /etc/hosts.
Handling c111bc2n11 in /etc/hosts.
Handling localhost6.localdomain6 in /etc/hosts.
Handling c111bc2mm1 in /etc/hosts.
Getting reverse zones, this may take several minutes for a large cluster.
Completed getting reverse zones.
Updating zones.
Completed updating zones.
Restarting bind9
Restarting named complete
Updating DNS records, this may take several minutes for a large cluster.
Completed updating DNS records.

Nodes can be resolved on this mn.

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Jing Sun - 2014-01-16

YinLe,

Please add this known issue into xcat release note once we announce the support for the Ubuntu 13.10, and list the workaround together.

Thx.

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Jing Sun - 2014-01-16

status: open --> pending
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yangsong - 2014-02-19

status: pending --> open

component: --> general
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yangsong - 2014-02-19

hi, this defect can be reproduced on rhels7.0-snapshot 6, which ships
perl-Net-DNS-0.72-5.el7.ppc64

This problem can be workarounded if the first "." in domain string ".ppd.pok.ibm.com." is deleted.

Can someone take a look at our makedns code to see if it is appropriate to delete the starting "." ?

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Lissa Valletta - 2014-02-20

I have taken a look at this issue yesterday, I have listed my debug informations in #1961, so the main changes is redhat7 and ubuntu13 are expecting the domain as for example, "cluster.com", but originally it's ".cluster.com", so I think a easy fix could be to check

if the os is ubuntu13 or redhat7 or above, then do not add '.' before $domain.
For example
in ddns.pm
unless ($domain =~ /^./) { $domain = '.'.$domain; }

if the os is ubuntu13 or redhat7 or above, then do not add '.' before $domain.

But on the other way, I'm thinking maybe we need to know why the interface of libnet-dns-perl changes, I assume the interface should be backward compatible even the version is upgraded, so maybe it's worth to get an official reply about this change from LTC ?

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XiaoPeng Wang - 2014-02-26

I found make the domain name has not '.' at beginning of name can work for both old and new version of Net-DNS perl module, so I made the change that keep domain name to be without . at beginning.

d8dedfb
4abeecb

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XiaoPeng Wang - 2014-02-26

status: open --> test

assigned_to: Jing Sun --> XiaoPeng Wang
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Lissa Valletta - 2014-03-25

Xiao Peng please verify and close

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Le Yin - 2014-05-12

Milestones: 2.8.4 --> 2.8.5
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Le Yin - 2014-05-12

status: test --> closed
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makedns -n failed on Ubuntu 13.10

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#3961 makedns -n failed on Ubuntu 13.10

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The implementation is different for "sub new() " in /usr/lib/perl5/Net/DNS/Question.pm: