問題：docker拉取最新竟像時：sudo docker pull tensorflow/serving:latest-gpu
出現報錯：
Error response from daemon: Get https://registry-1.docker.io/v2/tensorflow/serving/manifests/latest-gpu: Get https://auth.docker.io/token?scope=repository%3Atensorflow%2Fserving%3Apull&service=registry.docker.io: net/http: TLS handshake timeout
ai-serving@aiserving-KVM:~$ sudo docker pull tensorflow/serving:latest-gpu
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout
解決辦法：
使用國內的Docker倉庫daocloud：
$ echo "DOCKER_OPTS=\"\$DOCKER_OPTS --registry-mirror=http://f2d6cb40.m.daocloud.io\"" | sudo tee -a /etc/default/docker
$ sudo service docker restart
執行完這兩條語句之后，重新拉取鏡像即可：（正在拉取鏡像）
