Error: Protected multilib versions: zlib-1.2.3-29.el6.i686 != zlib-1.2.3-27.el6.x86_64

 You could try using --skip-broken to work around the problem

 You could try running: rpm -Va --nofiles --nodigest

原因：多个库共存冲突

解决办法：在执行命令后面加上：--setopt=protected_multilib=false 

yum install -y  --setopt=protected_multilib=false  zlib-1.2.3-29.el6.i686