yum mirrorlist 실패 네트워크·DNS

yum mirrorlist 조회 실패

Could not retrieve mirrorlist http://mirrorlist.centos.org/...

대개 인터넷/게이트웨이/DNS 문제.

ip addr; route -n; cat /etc/resolv.conf
# DNS 예: nameserver 8.8.8.8
ping -c1 8.8.8.8

→ yum/wget DNS / CentOS6 EOL → vault mirror