国内YUM源配置

1、什么是yum仓库?

yum仓库就是使用yum命令下载软件的镜像地址。

我们通常使用 yum install 命令来在线安装 linux系统的软件，这种方式可以自动处理依赖性关系，并且一次安装所有依赖的软体包，但是经常会遇到从国外镜像下载速度慢，无法下载的情况。那么此时我们就需要把我们的yum 源改为国内的镜像。

2.yum的配置文件(二选一)

yum 的配置文件在 /etc/yum.repos.d 目录下, 其中有多个配置文件,每一个配置文件中都可以配置一个或多个repository, 但是最终会被合并为一个交给系统，所以多个文件只是为了方便管理。

2.1配置阿里YUM源

进入阿里镜像仓库网站 https://opsx.alibaba.com/mirror   # 找到相关,点击帮助按钮

2.2配置步骤

(1)备份，将 CentOS-Base.repo 为CentOS-Base.repo.backup

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

(2)下载新的 CentOS-Base.repo 到CentOS-Base.repo

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

(3) 运行清除缓存

yum clean all     # 清除系统所有的yum缓存
yum makecache     # 生成yum缓存
yum update

3.配置清华源

进入清华源仓库网站:https://mirrors.tuna.tsinghua.edu.cn/help/centos/ # 找到相关,点击 ?

(1) 首先备份CentOS-Base.repo

cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

(2) 将/etc/yum.repos.d/CentOS-Base.repo清空并重新写入清华源

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# 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-$releasever - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

(3) 清除缓存

yum clean all     # 清除系统所有的yum缓存
yum makecache     # 生成yum缓存
yum update

3.epel源安装和配置

(1) 查看可用的epel源

cd /etc/yum.repos.d
[root@localhost yum.repos.d]#yum list | grep epel-release
epel-release.noarch                         7-11                       extras

(2) 安装 epel

[root@localhost yum.repos.d]#yum install -y epel-release

(3)或配置阿里镜像提供的epel源

wget -O /etc/yum.repos.d/epel-7.repo  http://mirrors.aliyun.com/repo/epel-7.repo

4、查看yum源

查看所有的yum源：

yum repolist all

查看可用的yum源：

yum repolist enabled

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