イメージプルが "i/o timeout" で失敗することがある

Issue

• Red Hat コンテナーレジストリーからのイメージプルが、断続的に i/o timeou エラーで失敗します。

• skopeo を使用してコンテナーイメージを手動でプルする場合でも、同じエラーが発生します。

  $ skopeo --debug inspect docker://registry.redhat.io/openshift3/ose-pod:v3.11
  DEBU[0000] reference rewritten from 'registry.redhat.io/openshift3/ose-pod:v3.11' to 'registry.redhat.io/openshift3/ose-pod:v3.11' 
  DEBU[0000] Trying to pull "registry.redhat.io/openshift3/ose-pod:v3.11" 
  DEBU[0000] Returning credentials from /root/.docker/config.json 
  DEBU[0000] Using registries.d directory /etc/containers/registries.d for sigstore configuration 
  DEBU[0000]  Using "default-docker" configuration        
  DEBU[0000]  No signature storage configuration found for registry.redhat.io/openshift3/ose-pod:v3.11 
  DEBU[0000] Looking for TLS certificates and private keys in /etc/docker/certs.d/registry.redhat.io 
  DEBU[0000] GET https://registry.redhat.io/v2/           
  DEBU[0000] Ping https://registry.redhat.io/v2/ status 401 
  DEBU[0000] GET https://registry.redhat.io/auth/realms/rhcc/protocol/redhat-docker-v2/auth?account=example&scope=repository%3Aopenshift3%2Fose-pod%3Apull&service=docker-registry 
  DEBU[0001] GET https://registry.redhat.io/v2/openshift3/ose-pod/manifests/v3.11 
  DEBU[0001] GET https://registry.redhat.io/v2/openshift3/ose-pod/manifests/sha256:b40212147173e580b997654e68c41720e0ec9c588f5b71bad78aa5cc5b514678 
  DEBU[0002] Downloading /v2/openshift3/ose-pod/blobs/sha256:3ecf70fa97ed935771a86af924d074082be79211cb3c4cf0fc4c9a5fe5841efa 
  DEBU[0002] GET https://registry.redhat.io/v2/openshift3/ose-pod/blobs/sha256:3ecf70fa97ed935771a86af924d074082be79211cb3c4cf0fc4c9a5fe5841efa 
  FATA[0032] Get https://registry.redhat.io/v2/openshift3/ose-pod/blobs/sha256:3ecf70fa97ed935771a86af924d074082be79211cb3c4cf0fc4c9a5fe5841efa: dial tcp 92.123.22.210:443: i/o timeout