常用源

epel源

yum install epel-release

ius源

CentOS 7 

rpm -ivh https://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release-1.0-14.ius.centos7.noarch.rpm

CentOS 6

rpm -ivh http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/x86_64/ius-release-1.0-14.ius.centos6.noarch.rpm

#nginx

# cat /etc/yum.repos.d/nginx.repo

#centos6

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/6/$basearch/
gpgcheck=0
enabled=1

###############

centos7

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1