share dari saya,
saya coba di centos 6.x dgn nginx-proxy lancar,
saya coba di centos 5.x , switch ke web server apache, hiawatha-proxy, nginx-proxy tidak berhasil;
Creating virtual environment...
Running virtualenv with interpreter /usr/bin/python2.7
The --no-site-packages flag is deprecated; it is now the default behavior.
New python executable in /root/.local/share/letsencrypt/bin/python2.7
Also creating executable in /root/.local/share/letsencrypt/bin/python
Installing setuptools...............................done.
Installing pip...............................done.
Installing Python packages...
Had a problem while installing Python packages:
Collecting argparse==1.4.0 (from -r /tmp/tmp.eazMEc1952/letsencrypt-auto-requirements.txt (line 5))
/root/.local/share/letsencrypt/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:315: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning.
SNIMissingWarning
Downloading argparse-1.4.0-py2.py3-none-any.whl
Collecting pycparser==2.14 (from -r /tmp/tmp.eazMEc1952/letsencrypt-auto-requirements.txt (line 11))
Downloading pycparser-2.14.tar.gz (223kB)
Collecting cffi==1.4.2 (from -r /tmp/tmp.eazMEc1952/letsencrypt-auto-requirements.txt (line 14))
Downloading cffi-1.4.2.tar.gz (365kB)
Complete output from command python setup.py egg_info:
unable to execute 'gcc44': No such file or directory
unable to execute 'gcc44': No such file or directory
No working compiler found, or bogus compiler options
passed to the compiler from Python's distutils module.
See the error messages above.
(If they are about -mno-fused-madd and you are on OS/X 10.8,
see http://stackoverflow.com/questions/22313407/ .)
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-CydAeu/cffi
You are using pip version 8.0.3, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.