下载组学镜像是出现网络错误，或者下载很缓慢：
[root@VM_0_16_centos ~]# docker pull docker.io/omicsclass/gene-family
Using default tag: latest
Trying to pull repository docker.io/omicsclass/gene-family ...
latest: Pulling from docker.io/omicsclass/gene-family
ab5ef0e58194: Already exists
3afe06e85076: Already exists
c1efb2f31722: Already exists
06e3b1e6e579: Retrying in 4 seconds
error pulling image configuration: received unexpected HTTP status: 500 Internal Server Error
