安装pythod-virtualenv

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Centos6.5环境安装pythod-virtualenv时，yum安装失败：

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$ yum install python-virtualenv

错误提示：

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$ yum install python-virtualenv
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirrors.btte.net
 * extras: mirrors.yun-idc.com
 * updates: mirrors.btte.net
Setting up Install Process
No package python-virtualenv available.
Error: Nothing to do

没有找到此问题的具体原因和解决方案，所以只能更换virtualenv的安装方式。

另一种安装方式：

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$ yum install python-setuptools  
$ easy_install virtualenv

报错

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[root@server45 ~]# pip install https://github.com/pypa/virtualenv/tarball/develop
Collecting https://github.com/pypa/virtualenv/tarball/develop
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/tarball/develop
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/tarball/develop
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/tarball/develop
/usr/local/python27/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/legacy.tar.gz/develop
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/legacy.tar.gz/develop
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /pypa/virtualenv/legacy.tar.gz/develop
/usr/local/python27/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading https://github.com/pypa/virtualenv/tarball/develop
     - 1.7MB 25.2MB/s
Installing collected packages: virtualenv
  Running setup.py install for virtualenv
Successfully installed virtualenv-13.2.0.dev0
[root@server45 ~]# pip install virtualenv

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r service not known'))': /simple/setuptools/
Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
/root/.local/share/letsencrypt/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning

http://stackoverflow.com/questions/29155407/connection-to-pypi-python-org-timed-out

https://github.com/pypa/pip/issues/2269