[CentOS] Could not resolve host: mirror.centos.org

Александр Кириллов nevis2us at infoline.su
Sat Sep 6 14:32:01 UTC 2014


>> There seems to be a problem with my local dns server resolving
>> mirror.centos.org.
>> I know something about dns but obviously not enough to figure out what
>> might be wrong here or how to fix
>> this in bind configs. The SERVFAIL errors below seem to be related to
>> AAAA and MX queries for the domain.
>> Please advise. TIA.
>> 
>> 
>> # host mirror.centos.org 8.8.8.8
>> Using domain server:
>> Name: 8.8.8.8
>> Address: 8.8.8.8#53
>> Aliases:
>> 
>> mirror.centos.org has address 69.167.139.9
>> 
>> 
>> # host mirror.centos.org
>> mirror.centos.org has address 66.109.26.212
>> Host mirror.centos.org not found: 2(SERVFAIL)
>> Host mirror.centos.org not found: 2(SERVFAIL)
>> 
>> 
>> # tail -F /var/named/chroot/var/named/data/named.run
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 85.12.30.226#53
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 93.113.36.66#53
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 94.46.190.42#53
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 85.12.30.226#53
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 93.113.36.66#53
>> error (FORMERR) resolving 'mirror.centos.org/AAAA/IN': 94.46.190.42#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 85.12.30.226#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 93.113.36.66#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 94.46.190.42#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 85.12.30.226#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 93.113.36.66#53
>> error (FORMERR) resolving 'mirror.centos.org/MX/IN': 94.46.190.42#53
>> 
> 
> Try asking the correct type (A record only) and you'll have the correct
> answer : the three PDNS servers having delegation for mirror.centos.org
> will only answer for A records (we have obviously no MX record for
> mirror.centos.org and, unfortunately, no AAAA records for those 
> machines
> either)
> 
> PS : host is considered "deprecated" so switch to dig instead ? ;-)

Thanks for your answer, Fabian,
I forgot to mention in the OP that the source of the error is yum with 
scl repo enabled:

# yum distro-sync
Loaded plugins: fastestmirror, priorities, refresh-packagekit, security, 
verify
...
http://mirror.centos.org/centos/6/SCL/x86_64/repodata/repomd.xml: [Errno 
14] PYCURL ERROR 6 - "Could not resolve host: mirror.centos.org (Could 
not contact DNS servers)"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: 
scl. Please verify its path and try again

I'm using "host" for debugging only and as 8.8.8.8 seems to be able to 
handle these requests correctly
I could probably use it as a forwarder but may be there's a way to tweak 
bind configs to work around the problem?




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