How to , and other stuff about linux, photo, php … A linux, photography blog. To remember some linux situation, and fix them quickly.

Well today a new problem.

I have try to install the letsencrypt  module on a plesk centos 6 server . That have python 2.6 and you will get a warning I think that is not working with python2.6 but the problem is other module.

The error’s look something like this

Fehler: Fehler bei der Installation des SSL-Zertifikats von Let’s Encrypt: Failed letsencrypt execution: /usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/cryptography/__init__.py:25: DeprecationWarning: Python 2.6 is no longer supported by the Python core team, please upgrade your Python.

DeprecationWarning

Traceback (most recent call last):

File "/usr/local/psa/var/modules/letsencrypt/venv/bin/letsencrypt", line 11, in <module>

sys.exit(main())

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/letsencrypt/cli.py", line 1950, in main

plugins = plugins_disco.PluginsRegistry.find_all()

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/letsencrypt/plugins/disco.py", line 168, in find_all

plugin_ep = PluginEntryPoint(entry_point)

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/letsencrypt/plugins/disco.py", line 31, in __init__

self.plugin_cls = entry_point.load()

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/pkg_resources/__init__.py", line 2201, in load

self.require(*args, **kwargs)

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/pkg_resources/__init__.py", line 2218, in require

items = working_set.resolve(reqs, env, installer)

File "/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages/pkg_resources/__init__.py", line 835, in resolve

raise VersionConflict(dist, req).with_context(dependent_req)

ContextualVersionConflict: (cryptography 1.1 (/usr/local/psa/var/modules/letsencrypt/venv.gUBSl/lib/python2.6/site-packages), Requirement.parse(‘cryptography>=1.3’), set([‘PyOpenSSL’]))

The problem actually is the crypthography module.

So the fix is

cd /usr/local/psa/var/modules/letsencrypt/venv/bin

./pip install –upgrade cryptography