在使用pip安装软件包时，提示我的pip版本过低，并报错

root@ceph-admin:~# pip install ceph-deploy
Collecting ceph-deploy
  Downloading https://files.pythonhosted.org/packages/1f/15/8dcbd2054670a8761d6484e588739cac5681e5661e9379862d121188b545/ceph-deploy-2.0.1.tar.gz (115kB)
    100% |████████████████████████████████| 122kB 52kB/s 
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    ImportError: No module named setuptools
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-5IWWdl/ceph-deploy/
You are using pip version 8.1.1, however version 18.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

于是乎，我先按照提示给pip升了个级，如下

root@ceph-admin:~# pip install --upgrade pip

然后重新安装软件，但是又出现报错

root@ceph-admin:~# pip install ceph-deploy
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ImportError: cannot import name main

历经千辛万苦，在百度上找到了解决办法

root@ceph-admin:~# vim /usr/bin/pip

将 /usr/bin/pip 文件中：

from pip import  main
if __name__ == '__main__':
    sys.exit(main())

改为：

from pip import __main__
if __name__ == '__main__':
    sys.exit(__main__._main())

然后信心满满的重新安装软件，但是没想到，又报错了

root@ceph-admin:~# pip install ceph-deploy
Collecting ceph-deploy
  Using cached https://files.pythonhosted.org/packages/1f/15/8dcbd2054670a8761d6484e588739cac5681e5661e9379862d121188b545/ceph-deploy-2.0.1.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    ImportError: No module named setuptools
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-7neA7f/ceph-deploy/

又经历了久久八十一难，原来是缺少了一个叫setuptools==33.1.1的包，少啥就安啥

root@ceph-admin:~# pip install setuptools==33.1.1

成功后，再次安装目的包，成功

root@ceph-admin:~# pip install ceph-deploy
Collecting ceph-deploy
  Using cached https://files.pythonhosted.org/packages/1f/15/8dcbd2054670a8761d6484e588739cac5681e5661e9379862d121188b545/ceph-deploy-2.0.1.tar.gz
Requirement already satisfied: setuptools in /usr/local/lib/python2.7/dist-packages (from ceph-deploy) (33.1.1)
Installing collected packages: ceph-deploy
  Running setup.py install for ceph-deploy ... done
Successfully installed ceph-deploy-2.0.1

并且pip版本也成功的升级了

root@ceph-admin:~# pip -V
pip 18.1 from /usr/local/lib/python2.7/dist-packages/pip (python 2.7)