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Plugin [loop] not work with systemd-resolved running #2087

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@mritd

Description

@mritd

When systemd-resolved is running, nameserver in /etc/resolved.conf default to 127.0.0.53;
The plugin loop detects two DNS query, and finally coredns fails to start.

Environment:

  • Ubuntu 18.04.1
  • Kubernetes 1.11.2
  • CoreDNS 1.2.2

Error log:

docker1.node ➜  kubectl logs coredns-55f86bf584-7sbtj -n kube-system
.:53
2018/09/06 13:02:45 [INFO] CoreDNS-1.2.2
2018/09/06 13:02:45 [INFO] linux/amd64, go1.11, eb51e8b
CoreDNS-1.2.2
linux/amd64, go1.11, eb51e8b
2018/09/06 13:02:45 [INFO] plugin/reload: Running configuration MD5 = 86e5222d14b17c8b907970f002198e96
2018/09/06 13:02:45 [FATAL] plugin/loop: Seen "HINFO IN 2050421060481615995.5620656063561519376." more than twice, loop detected

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