How to setup Let's Encrypt certificates on Ubuntu 12.04

Hey yow
first, we login has root. and enable mod_ssl

a2enmod ssl
service apache2 restart

Next, we can install python2.7-dev and Git

echo "deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted" | sudo tee -a /etc/apt/sources.list.d/precise-updates.list
sudo apt-get update
sudo apt-get install python2.7-dev git

we can installed the letsencrypt client:

git clone --branch 0.30.x https://github.com/letsencrypt/letsencrypt

cd letsencrypt

we can shut down Apache – there is probably a better way, but on a low-traffic test server/domain, that’s entirely okay for me. I then requested a new certificate and started Apache up again.

service apache2 stop

./letsencrypt-auto certonly --no-self-upgrade --standalone -d example.com -d www.example.com 

service apache2 start

Don't forget to add --no-self-upgrade to your renew cron job.

Now we went into the config file of virtual host and changed things around a bit. I am sure that it is frowned upon to put two VirtualHost directives with two different ports into one config file,

SSLEngine on

SSLCertificateFile /etc/letsencrypt/live/example.com/cert.pem

SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem

SSLCertificateChainFile /etc/letsencrypt/live/example.com/fullchain.pem

One more apache restart

service apache2 restart