CentOS6/7切换阿里云镜像源并安装EPEL/IUS/REMI仓库
CentOS安装完毕后，默认的yum源是国外的，国内访问速度慢，需要切换为国内的源，这里选用的是阿里云的源，主要是因为镜像比较全，切换方法如下：
切换基本源为阿里云源：
先备份在切换：
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo修改为外网地址
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo第三方源介绍：
EPEL是专门为RHEL、CentOS等Linux发行版提供额外rpm包的。很多os中没有或比较旧的rpm，在epel仓库中可以找到;
IUS只为RHEL和CentOS这两个发行版提供较新版本的rpm包。如果在os或epel找不到某个软件的新版rpm，软件官方又只提供源代码包的时候，可以来ius源中找，几乎都能找到。例如haproxy，在CentOS 6的epel中只有1.5版本的，但ius中却提供了1.6和1.7版本。
IUS源的站点根目录：https://dl.iuscommunity.org/pub/ius/。
IUS提供4个分支的rpm包：stable、archive、development和testing
Remi源中的软件几乎都是最新稳定版本；
安装第三方源epel
yum install -y epel-release如果不能安装成功可以直接安装rpm包：
CentOS/RHEL 6
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
CentOS/RHEL 7
rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm安装IUS仓库
CentOS 6
rpm -Uvh https://centos6.iuscommunity.org/ius-release.rpm
CentOS 7
rpm -Uvh https://centos7.iuscommunity.org/ius-release.rpm安装REMI仓库:
CentOS/RHEL 6
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
CentOS/RHEL 7
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm最后修改/etc/yum.repos.d目录下的epel.repo、ius.repo、remi.repo文件中的第三方镜像地址为阿里云地址：
如下所示：
epel.repo
cat epel.repo
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://mirrors.aliyun.com/epel/7/$basearch/debug
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel/7/SRPMS
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0ius.repo
[root@fabric yum.repos.d]# cat ius.repo
[ius]
name = IUS for Enterprise Linux 7 - $basearch
baseurl = https://mirrors.aliyun.com/ius/7/$basearch/
enabled = 1
repo_gpgcheck = 0
gpgcheck = 1
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-IUS-7
[ius-debuginfo]
name = IUS for Enterprise Linux 7 - $basearch - Debug
baseurl = https://mirrors.aliyun.com/ius/7/$basearch/debug/
enabled = 0
repo_gpgcheck = 0
gpgcheck = 1
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-IUS-7
[ius-source]
name = IUS for Enterprise Linux 7 - Source
baseurl = https://mirrors.aliyun.com/ius/7/src/
enabled = 0
repo_gpgcheck = 0
gpgcheck = 1
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-IUS-7remi.repo
[root@fabric yum.repos.d]# cat remi.repo
# Repository: https://mirrors.aliyun.com/remi/
# Blog: http://blog.remirepo.net/
# Forum: http://forum.remirepo.net/
[remi]
name=Remi's RPM repository for Enterprise Linux 7 - $basearch
#baseurl=https://mirrors.aliyun.com/remi/enterprise/7/remi/$basearch/
#mirrorlist=https://rpms.remirepo.net/enterprise/7/remi/httpsmirror
mirrorlist=https://mirrors.aliyun.com/remi/enterprise/7/remi/mirror
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php55]
name=Remi's PHP 5.5 RPM repository for Enterprise Linux 7 - $basearch
#baseurl=https://mirrors.aliyun.com/remi/enterprise/7/php55/$basearch/
#mirrorlist=https://rpms.remirepo.net/enterprise/7/php55/httpsmirror
mirrorlist=https://mirrors.aliyun.com/remi/enterprise/7/php55/mirror
# NOTICE: common dependencies are in "remi-safe"
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php56]
name=Remi's PHP 5.6 RPM repository for Enterprise Linux 7 - $basearch
#baseurl=https://mirrors.aliyun.com/remi/enterprise/7/php56/$basearch/
#mirrorlist=https://rpms.remirepo.net/enterprise/7/php56/httpsmirror
mirrorlist=https://mirrors.aliyun.com/remi/enterprise/7/php56/mirror
# NOTICE: common dependencies are in "remi-safe"
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-test]
name=Remi's test RPM repository for Enterprise Linux 7 - $basearch
#baseurl=https://mirrors.aliyun.com/remi/enterprise/7/test/$basearch/
#mirrorlist=https://rpms.remirepo.net/enterprise/7/test/mirror
mirrorlist=https://mirrors.aliyun.com/remi/enterprise/7/test/mirror
# WARNING: If you enable this repository, you must also enable "remi"
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-debuginfo]
name=Remi's RPM repository for Enterprise Linux 7 - $basearch - debuginfo
baseurl=https://mirrors.aliyun.com/remi/enterprise/7/debug-remi/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php55-debuginfo]
name=Remi's PHP 5.5 RPM repository for Enterprise Linux 7 - $basearch - debuginfo
baseurl=https://mirrors.aliyun.com/remi/enterprise/7/debug-php55/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php56-debuginfo]
name=Remi's PHP 5.6 RPM repository for Enterprise Linux 7 - $basearch - debuginfo
baseurl=https://mirrors.aliyun.com/remi/enterprise/7/debug-php56/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-test-debuginfo]
name=Remi's test RPM repository for Enterprise Linux 7 - $basearch - debuginfo
baseurl=https://mirrors.aliyun.com/remi/enterprise/7/debug-test/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi清空yum缓存
yum clean all查看yum软件仓库列表
yum repolist生成缓存
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