每次使用yum安装软件都会出现一个fastestmirror的插件，都要等半天。所以禁用掉插件后再手动配置镜像源会加快安装速度。
禁用fastestmirror 插件
参考：
http://www.cnblogs.com/starof/p/4773209.html
禁用fastestmirror插件
vi /etc/yum/pluginconf.d/fastestmirror.conf
#修改内容
enabled = 1//由1改为0，禁用该插件
或者禁用所有插件【不推荐】
vi /etc/yum.conf
#修改内容
plugins=1 //改为0，不使用插件
启用清华源
参考：
https://mirror.tuna.tsinghua.edu.cn/help/centos/
首先备份 CentOS-Base.repo
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
编辑 /etc/yum.repos.d/CentOS-Base.repo
vi /etc/yum.repos.d/CentOS-Base.repo
将以下内容写入
# 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
启用清华EPEL源
参考：
https://mirror.tuna.tsinghua.edu.cn/help/epel/
http://harttle.com/2016/08/08/vim-search-in-file.html
如果你之前没有安装epel源，在替换为清华源后，epel安装时本身就是清华的epel'源了，就不用执行这一步了，如果你之前安装了系统镜像源和标准epel源，又需要修改epel源的话，需要进行本次操作。
首先从CentOS Extras这个源（tuna也有镜像）里安装epel-release：
yum install epel-release
当前tuna已经在epel的官方镜像列表里，所以不需要其他配置，mirrorlist机制就能让你的服务器就近使用tuna的镜像。如果你想强制 你的服务器使用tuna的镜像，可以修改/etc/yum.repos.d/epel.repo ，将baseurl 开头的行取消注释（删掉# ），并注释mirrorlist 开头的行（在头部加一个# ）。
vi /etc/yum.repos.d/epel.repo
在命令模式下输入:%s/^#base/base去掉所有的baseurl的注释
在命令模式下输入:%s/^mirror/#mirror去掉所有的baseurl的注释
接下来，把这个文件里的http://download.fedoraproject.org/pub
替换成https://mirrors.tuna.tsinghua.edu.cn即可
:%s#http://download.fedoraproject.org/pub#https://mirrors.tuna.tsinghua.edu.cn
下面是替换后的内容
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
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