How to Install Let’s Encrypt and Create SSL on Ubuntu 16.04 & 14.04

Let’s Encrypt is a certificate authority (CA) providing free SSL/TLS certificates for enhanced security freely.

Setup Let’s Encrypt Client

We can download the certbot-auto Let’s Encrypt client and save it in /usr/sbin directory. Use following command to do it.

$ sudo wget https://dl.eff.org/certbot-auto -O /usr/sbin/certbot-auto $ sudo chmod a+x /usr/sbin/certbot-auto 

Create SSL Certificate

Let’s Encrypt performs Domain Validation (DV) automatically with multiple challenges. Once Certificate Authority (CA) verified authenticity of your domain, ssl certificate is issued.

$ sudo certbot-auto  certonly --standalone -d example.com  -d www.example.com 

After getting sucess of all validations, certificate files will be places under below path.

$ cd /etc/letsencrypt/live/example.com $ ls  

Files List:

  cert.pem   chain.pem   fullchain.pem   privkey.pem 

Configure SSL in VirtualHost

Please find below configurations for Apache and Nginx web server. Edit virtual host configuration file and add below entries for certificate.

Nginx:

ssl on; ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; 

Apache:

SSLEngine on SSLCertificateFile /etc/letsencrypt/live/example.com/cert.pem SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem SSLCertificateChainFile /etc/letsencrypt/live/example.com/chain.pem 

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