vmstation : https://my.vmware.com/web/vmware/details?downloadGroup=WKST-1504-WIN&productId=799&rPId=31698
阿里下载64bit镜像：http://mirrors.aliyun.com/centos/7.6.1810/isos/
https://www.centos.org/download/mirrors/
乌班图：
http://releases.ubuntu.com/
