>> 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?