1. Replacing the Repository Mirror First, back up the official repository. 1 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup Download the new repository to /etc/yum.repos.d/ CentOS 5 1 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo CentOS 6 1 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo CentOS 7 1 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo Generate the metadata cache. 1 yum makecache 2. Accessing NTFS File Systems The Linux kernel currently only supports reading Microsoft’s NTFS file system.

1. Characteristics of Fixtures Fixtures are a new way to provide initial data, and they are used by Django’s test framework to handle test data for unit tests. Unlike SQL files, a fixture can provide a serialized file that Django’s serialization system understands; it is read, automatically converted into the corresponding model, and then saved into the database.