centos7 yum update error -> check nsswitch.con
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yum update
Loaded plugins: fastestmirror, langpacks
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Name or service not known"
One of the configured repositories failed (Unknown),
==============================
error ping..
nslookup yum.postgresql.org
Name: yonada.postgresql.org
Address: 174.143.35.196
--> OK
# ping yum.postgresql.org
ping: unknown host yum.postgresql.org
--> FAIL
이경우 dns의 문제가 아니다.. nssswitch 를 수정하라.
# vi /etc/nsswitch.conf
hosts: files
--> 아래로 변경
hosts: files dns myhostname
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