眾所周知，官方的yum源在國內訪問效果不佳，需要改為國內比較好的阿里雲yum源
首先確保安裝wget命令
yum install wget -y# 備份當前的yum源
mv /etc/yum.repos.d /etc/yum.repos.d.backup4comex
# 新建空的yum源設定目錄
mkdir /etc/yum.repos.d
wget -o /etc/yum.repos.d/centos-base.repo
# 重建快取
yum clean all
yum makecache
# unless you are manually picking other mirrors.
## if the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.##
[base]
name=centos-$releasever - base - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=1
gpgkey=
#released updates
[updates]
name=centos-$releasever - updates - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=1
gpgkey=
#additional packages that may be useful
[extras]
name=centos-$releasever - extras - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=1
gpgkey=
#additional packages that extend functionality of existing packages
[centosplus]
name=centos-$releasever - plus - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=1
enabled=0
gpgkey=
#contrib - packages by centos users
[contrib]
name=centos-$releasever - contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=1
enabled=0
gpgkey=
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