现象：
ks@ubuntu-18:/work/project/ldb$ docker-compose up
Creating network "ldb_default" with the default driver
Pulling zookeeper (wurstmeister/zookeeper:)...
ERROR: Get https://registry-1.docker.io/v2/wurstmeister/zookeeper/manifests/latest: net/http: TLS handshake timeout
解决方法：
ks@ubuntu-18:/work/project/ldb$ docker logout
Not logged in to https://index.docker.io/v1/
ks@ubuntu-18:/work/project/ldb$ docker-compose up
Pulling zookeeper (wurstmeister/zookeeper:)...
latest: Pulling from wurstmeister/zookeeper
参考文章：
