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Hello
First you need to clone the repo
git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt
Now we are going to create a certificate
NGINX
./letsencrypt-auto certonly --rsa-key-size 4096
Now, please follow the instructions. When it’s finished you will be able to find the certificate, chain and key at /etc/letsencrypt/live/domain
Apache
./letsencrypt-auto --apache --rsa-key-size 4096
Now, please follow the instructions. Let’s Encrypt will install the certificate automatically.