redis-trib.rb create a cluster fails

yum install ruby:

Ruby -y install yum
yum -y install RubyGems installation // RubyGem
GEM install redis redis // installation interface package
gem list // Check the interface package is installed successfully

 https://blog.51cto.com/chenql/1947291

Reproduced in: https: //www.cnblogs.com/neaos/p/11031833.html