因为客户的机器是内网，不能访问外网，需要把所有的yum 包，python包都提前离线安装好。
下载yum包
yum install epel-release # 这个软件包会自动配置yum的软件仓库。
yumdownloader --resolve redis
# yumdownloader 可以只下载不安装
# 如果提示没有yumdownloader 命令，需要先yum install yum-utils
rpm -ivh *.rpm --nodeps --force # 安装该文件夹下所有的rpm包
添加yum仓库
- 方法1：
echo "[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.2/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1" > /etc/yum.repos.d/mariadb.repo
rpm -iUvh https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64/pgdg-centos96-9.6-3.noarch.rpm
- 方法2：
rpm -iUvh https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64/pgdg-centos96-9.6-3.noarch.rpm
下载python包
pip install -r requirements.txt -t /dir/dir # 下载requirements.txt 里的到指定的目录
# 下载到本地
pip download -d /path/to/your/packages_path/ -r requirement.txt
"""
有时候安装某些包的时候会有错误提示，
1）The required version of setuptools (>=3.4.4) is not available,
and can't be installed while this script is running. Please
install a more recent version first, using
'easy_install -U setuptools'.
这个错误提示需要先升级setuptools，pip install --upgrade setuptools
2）EnvironmentError: mysql_config not found
yum install mysql-devel -y
"""
# 从本地目录安装
pip install --no-index --find-links=/path/to/your/packages_path/ -r requirements.txt