Reference:
https://unix.stackexchange.com/questions/164210/nslookup-command-not-found-error-on-rhel-centos-7
The minimal install likely did not come with the bind-utils package
You can install bind-utils with:
yum install bind-utils
Nslookup: command not found error on RHEL/CentOS 7
原文：https://www.cnblogs.com/coxiseed/p/10778825.html