→ http://letsencrypt.readthedocs.org/en/latest/using.html#apache
première install
./letsencrypt-auto \
–agree-tos \
–email admin@d-l.fr \
–apache \
–domain sancho.d-l.fr \
–rsa-key-size 4096
renouvellement
./letsencrypt-auto \
renew \
–apache \
–domain sancho.d-l.fr \
–rsa-key-size 4096