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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