Slow performance during image push or pull due to extra DNS query for openshift default registry

Solution In Progress - Updated -

Environment

  • Openshift Container Platform 3.6

Issue

  • slow performance during image push or pull
  • got the below error during s2i build.
Failed to pull image "docker-registry.default.svc:5000/...": rpc error: code = 2 desc = net/http: request canceled

Resolution

  • You can set the configuration in /etc/sysconfig/atomic-openshift-master.
OPENSHIFT_DEFAULT_REGISTRY=docker-registry.default.svc:5000
  • You can set server=/default.svc/ in /etc/dnsmasq.d as a workaround according to BZ 1506418
ex)
# echo 'server=/default.svc/' > /etc/dnsmasq.d/node-dnsmasq2.conf

Root Cause

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