kubeadm init在pull image的时候一直失败？

Question

kubeadminit开始命令前，我已经设置了http和https代理了，可是还是出错？？这是什么原因呢？[preflight]Somefatalerrorsoccurred:[ERRORImagePull]:failedtopullimage[k8s.gcr.io/kube-apiserver-amd64:v1.11.2]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/kube-controller-manager-amd64:v1.11.2]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/kube-scheduler-amd64:v1.11.2]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/kube-proxy-amd64:v1.11.2]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/pause:3.1]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/etcd-amd64:3.2.18]:exitstatus1[ERRORImagePull]:failedtopullimage[k8s.gcr.io/coredns:1.1.3]:exitstatus1