Let's encrypt 一直提示『正在校验域名，请稍后..』（附日志）

在面板申请Let's encrypt 时，一直转圈提示『正在校验域名，请稍后..』，在/var/log/letsencrypt/letsencrypt.log可以看到如下日志及错误信息：

1. 2018-01-18 16:29:46,876:DEBUG:certbot.main:certbot version: 0.21.0
   
2. 2018-01-18 16:29:46,876:DEBUG:certbot.main:Arguments: ['-n']
   
3. 2018-01-18 16:29:46,876:DEBUG:certbot.main:Discovered plugins: PluginsRegistry(PluginEntryPoint#apache,PluginEntryPoint#manual,PluginEntryPoint#nginx,PluginEntryPoint#null,PluginEntryPoint#standalone,PluginEntryPoint#webroot)
   
4. 2018-01-18 16:29:46,899:DEBUG:certbot.log:Root logging level set at 20
   
5. 2018-01-18 16:29:46,899:INFO:certbot.log:Saving debug log to /var/log/letsencrypt/letsencrypt.log
   
6. 2018-01-18 16:29:46,900:DEBUG:certbot.plugins.selection:Requested authenticator None and installer None
   
7. 2018-01-18 16:29:46,900:DEBUG:certbot.log:Exiting abnormally:
   
8. Traceback (most recent call last):
   
9.   File "/opt/eff.org/certbot/venv/bin/letsencrypt", line 11, in <module>
   
10.     sys.exit(main())
    
11.   File "/opt/eff.org/certbot/venv/lib/python2.7/site-packages/certbot/main.py", line 1240, in main
    
12.     return config.func(config, plugins)
    
13.   File "/opt/eff.org/certbot/venv/lib/python2.7/site-packages/certbot/main.py", line 981, in run
    
14.     installer, authenticator = plug_sel.choose_configurator_plugins(config, plugins, "run")
    
15.   File "/opt/eff.org/certbot/venv/lib/python2.7/site-packages/certbot/plugins/selection.py", line 189, in choose_configurator_plugins
    
16.     authenticator = installer = pick_configurator(config, req_inst, plugins)
    
17.   File "/opt/eff.org/certbot/venv/lib/python2.7/site-packages/certbot/plugins/selection.py", line 25, in pick_configurator
    
18.     (interfaces.IAuthenticator, interfaces.IInstaller))
    
19.   File "/opt/eff.org/certbot/venv/lib/python2.7/site-packages/certbot/plugins/selection.py", line 67, in pick_plugin
    
20.     "Missing command line flags. For non-interactive execution, "
    
21. MissingCommandlineFlag: Missing command line flags. For non-interactive execution, you will need to specify a plugin on the command line.  Run with '--help plugins' to see a list of options, and see https://eff.org/letsencrypt-plugins for more detail on what the plugins do and how to use them.

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操作系统版本是CentOS 7
内核：4.14.14-1.el7.elrepo.x86_64

在网上搜索后尝试：

1. wget -O /www/server/panel/certbot-auto http://download.bt.cn/install/certbot-auto.init -T 5
   
2. chmod +x /www/server/panel/certbot-auto && /www/server/panel/certbot-auto -n

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失败。第二步的时候还是提示Missing command line flags.，附全部输出如下：

1. Bootstrapping dependencies for RedHat-based OSes...
   
2. yum is /usr/bin/yum
   
3. Loaded plugins: fastestmirror
   
4. Loading mirror speeds from cached hostfile
   
5. * base: centos.s.uw.edu
   
6. * elrepo: hkg.mirror.rackspace.com
   
7. * epel: mirrors.cat.pdx.edu
   
8. * extras: mirrors.cat.pdx.edu
   
9. * updates: mirrors.cat.pdx.edu
   
10. Package gcc-4.8.5-16.el7_4.1.x86_64 already installed and latest version
    
11. Package augeas-libs-1.4.0-2.el7_4.2.x86_64 already installed and latest version
    
12. Package 1:openssl-1.0.2k-8.el7.x86_64 already installed and latest version
    
13. Package 1:openssl-devel-1.0.2k-8.el7.x86_64 already installed and latest version
    
14. Package libffi-devel-3.0.13-18.el7.x86_64 already installed and latest version
    
15. Package redhat-rpm-config-9.1.0-76.el7.centos.noarch already installed and latest version
    
16. Package ca-certificates-2017.2.14-71.el7.noarch already installed and latest version
    
17. Package python-2.7.5-58.el7.x86_64 already installed and latest version
    
18. Package python-devel-2.7.5-58.el7.x86_64 already installed and latest version
    
19. Package python-virtualenv-1.10.1-4.el7.noarch already installed and latest version
    
20. Package python-tools-2.7.5-58.el7.x86_64 already installed and latest version
    
21. Package python2-pip-8.1.2-5.el7.noarch already installed and latest version
    
22. Nothing to do
    
23. Upgrading certbot-auto 0.12.0 to 0.21.0...
    
24. Replacing certbot-auto...
    
25. Saving debug log to /var/log/letsencrypt/letsencrypt.log
    
26. Missing command line flags. For non-interactive execution, you will need to specify a plugin on the command line.  Run with '--help plugins' to see a list of options, and see https://eff.org/letsencrypt-plugins for more detail on what the plugins do and how to use them.

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另外一个信息是：我是 Python 开发者，在服务器上安装了 pyenv 进行多版本管理，但没有修改默认版本 python，所以应该和此问题无关