今年 6 月 6 日 以来国内很多 Docker 镜像源宣布下架，Docker 镜像源集体失效，这对于依赖 Docker 进行日常开发和运维工作的程序员来说，无疑增加了开发的难度。
# ping get.docker.com PING d3cxuo8f8w64ms.cloudfront.net (13.249.126.19): 56 data bytes64 bytes from 13.249.126.19: icmp_seq=0 ttl=244 time=164.000 ms64 bytes from 13.249.126.19: icmp_seq=1 ttl=244 time=163.631 ms64 bytes from 13.249.126.19: icmp_seq=2 ttl=244 time=163.929 ms64 bytes from 13.249.126.19: icmp_seq=3 ttl=244 time=165.425 ms64 bytes from 13.249.126.19: icmp_seq=4 ttl=244 time=171.066 ms64 bytes from 13.249.126.19: icmp_seq=5 ttl=244 time=164.234 ms
