CentOS 7 执行 certbot --nginx 报错解决方法

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CentOS 7 执行 certbot --nginx 报错，centos certbot 无法运行，错误信息如下：

Traceback (most recent call last):
  File "/usr/bin/certbot", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3138, in <module>
    @_call_aside
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3122, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3151, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 666, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 679, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 867, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'urllib3<1.23,>=1.21.1' distribution was not found and is required by requests

解决方法：

• 先卸载

pip uninstall urllib3
pip uninstall requests
pip uninstall  chardet

• 重新安装

pip install --upgrade --force-reinstall 'requests==2.6.0' urllib3

如果还是未解决请参考：Nginx 上配置 HTTPS 环境