错误：
[root@Cache conf]# yum install ruby rubygems
[root@Cache conf]# gem install redis
WARNING: RubyGems 1.2+ index not found for:
RubyGems will revert to legacy indexes degrading performance.
Updating metadata for 1 gems from http://rubygems.org/
.
complete
ERROR: Could not find a valid gem "redis" (>= 0) in any repository
解决：这个是由于没有安装rubygems-devel
[root@Cache conf]# yum install rubygems-devel
could not autowire no beans of|Could not find a valid gem ‘redis’ (>= 0) in any repository
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