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在阿里云上面的服务器有一台服务器，我已经安装好pip和virtualenv，我通过
virtualenv venv创建虚拟环境的时候提示的错误信息如下
root@Wireless:~/flasky# virtualenv venv
Running virtualenv with interpreter /usr/bin/python2
New python executable in /root/flasky/venv/bin/python2
Not overwriting existing python script /root/flasky/venv/bin/python (you must use /root/flasky/venv/bi n/python2)
Please make sure you remove any previous custom paths from your /root/.pydistutils.cfg file.
Installing setuptools, pkg_resources, pip, wheel...
Complete output from command /root/flasky/venv/bin/python2 - setuptools pkg_resources pip wheel:
Collecting setuptools
Downloading http://mirrors.aliyun.com/pypi/packages/a7/62/3995dc3067cbf8d4a13ddac0f87417b9a08799c586 b3faa77d62ad9085de/setuptools-34.1.0-py2.py3-none-any.whl (389kB)
Collecting pkg_resources
Exception:
Traceback (most recent call last):
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/basecommand.py", line 209, in main
status = self.run(options, args)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/commands/install.py", line 328, in run
wb.build(autobuilding=True)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/wheel.py", line 748, in build
self.requirement_set.prepare_files(self.finder)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_set.py", line 360, in prep are_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_set.py", line 512, in _pre pare_file
finder, self.upgrade, require_hashes)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_install.py", line 273, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 442, in find_requi rement
all_candidates = self.find_all_candidates(req.name)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 400, in find_all_c andidates
for page in self._get_pages(url_locations, project_name):
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 545, in _get_pages
page = self._get_page(location)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 648, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 760, in get_page
resp.raise_for_status()
File "/root/flasky/venv/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/models.py", line 840, in raise_for_status
raise HTTPError(http_error_msg, response=self)
HTTPError: 404 Client Error: Not Found for url: http://mirrors.aliyun.com/pypi/simple/pkg-resources/
----------------------------------------
...Installing setuptools, pkg_resources, pip, wheel...done.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/virtualenv.py", line 2363, in <module>
main()
File "/usr/lib/python3/dist-packages/virtualenv.py", line 719, in main
symlink=options.symlink)
File "/usr/lib/python3/dist-packages/virtualenv.py", line 988, in create_environment
download=download,
File "/usr/lib/python3/dist-packages/virtualenv.py", line 918, in install_wheel
call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
File "/usr/lib/python3/dist-packages/virtualenv.py", line 812, in call_subprocess
% (cmd_desc, proc.returncode))
OSError: Command /root/flasky/venv/bin/python2 - setuptools pkg_resources pip wheel failed with error code 2
我发现我的系统里有3个版本的pip，如下
pip 9.0.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)
root@Wireless:~/flasky# pip3 -V
pip 9.0.1 from /usr/local/lib/python3.5/dist-packages (python 3.5)
root@Wireless:~/flasky# pip2 -V
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)
我尝试过升级pip，但最后那个pip8.1无法升级到pip9，好像最高版本就是pip8，我
试过用以下命令进行升级：
pip install -U pip
pip install -U pip2
pip install -U pip3
pip2 install -U pip
pip2 install -U pip2
pip2 install -U pip3
pip3 install -U pip
pip3 install -U pip2
pip3 install -U pip3
HTTPError: 404 Client Error: Not Found for url: http://mirrors.aliyun.com/pyp...
这句说明阿里云服务器不向外发送请求。
解决方法：在服务器实例的“安全规则”---“外出方向”--“常用端口(TCP)” 选择http ；“授权策略”为允许。