github addr https://github.com/kubernets/etcd
docker hub addr https://hub.docker.com/u/kubernets
use shell script to pull docker image and replace origin tag
wget https://github.com/kubernets/etcd/raw/master/get-etcd-image.sh
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docker pull kubernets/etcd-amd64:3.2.18
docker tag kubernets/etcd-amd64:3.2.18 gcr.io/google-containers/etcd-amd64:3.2.18
docker rmi kubernets/etcd-amd64:3.2.18