大觅网环境搭建问题？

[平静的海啸]

大觅网环境搭建问题？
Xshell 6执行 docker build ‐t yi/centos7‐ssh .命令时总是报错报错信息如下：No match for argument: net-tool
Error: Unable to find a match
The command '/bin/sh -c yum install -y passwd openssh-server openssh-clients initscripts net-tool' returned a non-zero code: 1
请解答。