EPEL
EPEL的全称叫 Extra Packages for Enterprise Linux 。EPEL是由 Fedora 社区打造，为 RHEL 及衍生发行版如 CentOS、Scientific Linux 等提供高质量软件包的项目。
官方网址为：https://fedoraproject.org/wiki/EPEL
Centos安装命令： sudo yum install epel-release
rpmfusion
RPM Fusion provides software that the Fedora Project or Red Hat doesn’t want to ship. That software is provided as precompiled RPMs for all current Fedora versions and current Red Hat Enterprise Linux or clones versions; you can use the RPM Fusion repositories with tools like yum and PackageKit.
RPM Fusion is a merger of Dribble, Freshrpms, and Livna; our goal is to simplify end-user experience by grouping as much add-on software as possible in a single location. Also see our FoundingPrinciples.
官方网站为 https://rpmfusion.org/
Remi repository
Remi repository 是包含最新版本 PHP、MySQL、Python 包的 Linux 源，由 Remi 提供维护。
官方网站为 http://rpms.remirepo.net/。
Enterprise Linux 7 (with EPEL) x86_64 的安装方法:
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
wget https://rpms.remirepo.net/enterprise/remi-release-7.rpm
rpm -Uvh remi-release-7.rpm epel-release-latest-7.noarch.rpm如何要安装php的7.4版本则执行下面的命令：
yum -y --nogpgcheck install epel-release \
&& yum -y --nogpgcheck install https://rpms.remirepo.net/enterprise/remi-release-7.rpm \
&& yum -y --nogpgcheck install yum-utils \
&& yum-config-manager --enable remi-php74 \
&& yum -y --nogpgcheck install yum install nginx php php-cli php-fpm php-mysqlnd php-zip php-devel php-gd php-mcrypt php-mbstring php-curl php-xml php-pear php-bcmath php-json
WANDisco
安装新版本的git 库
# 卸载旧版 git
yum -y remove git
# 安装 centos7 WANDisco 仓库
yum install http://opensource.wandisco.com/centos/7/git/x86_64/wandisco-git-release-7-2.noarch.rpm
yum -y install git