安装grid时，task resolv.conf integrity failed

This task checks consistency of file /etc/resolv.conf file across nodes (more details)

  Check Failed on Nodes: [rac2] Check Succeeded On Nodes: [rac1] 

如果没有配置DNS（只在hosts文件里标明），检测/etc/resolv.conf会失败的，可以忽略该警告，直接 ignore 即可,不影响安装，或配置dns服务，重新检测。