Step 4/11 : RUN yum install net-tool
---> Running in b259e1ae180b
Last metadata expiration check: 0:12:19 ago on Wed Oct 2 11:29:32 2019.
No match for argument: net-tool
Error: Unable to find a match
The command '/bin/sh -c yum install net-tool' returned a non-zero code: 1
RUN yum install net-tool执行
应该是net-tools，你少了一个s