[시스템 운영] Error: Cannot retrieve repository metadata (repomd.xml) for repository

Explanation)

When yum update, display below

"Loaded plugins: fastestmirror, security
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again"

Answer)

vi /etc/resolv.conf

nameserver (DNS server IP)

END.