Letsencrypt.org

Let's Encrypt Free SSL Certificates

Let's Encrypt - Free SSL/TLS Certificates

Let’s Encrypt is a free, automated, and open Certificate Authority.

Site: http://letsencrypt.org

Getting started

https://letsencrypt.org/getting-started/

Certificates

Private key:

/etc/letsencrypt/live/[DOMAIN]/privkey.pem

Cert:

/etc/letsencrypt/live/[DOMAIN]/cert.pem
/etc/letsencrypt/live/[DOMAIN]/fullchain.pem   # <-- recommended option

/etc/letsencrypt/live/[DOMAIN]/README :

This directory contains your keys and certificates.

`privkey.pem`  : the private key for your certificate.
`fullchain.pem`: the certificate file used in most server software.
`chain.pem`    : used for OCSP stapling in Nginx >=1.3.7.
`cert.pem`     : will break many server configurations, and should not be used
                 without reading further documentation (see link below).

WARNING: DO NOT MOVE OR RENAME THESE FILES!
         Certbot expects these files to remain in this location in order
         to function properly!

We recommend not moving these files. For more information, see the Certbot
User Guide at https://certbot.eff.org/docs/using.html#where-are-my-certificates.

certbot

Ubuntu

Install:

sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update

sudo apt-get install certbot python-certbot-apache

Auto install certificates:

sudo certbot --apache

Or just get a certificate:

sudo certbot certonly --apache

Test automatic renewal:

sudo certbot renew --dry-run

ref: https://certbot.eff.org/lets-encrypt/ubuntubionic-apache

CentOS

Install:

wget https://dl.eff.org/certbot-auto
sudo mv certbot-auto /usr/local/bin/certbot-auto
sudo chown root /usr/local/bin/certbot-auto
sudo chmod 0755 /usr/local/bin/certbot-auto

Auto install certificates:

sudo /usr/local/bin/certbot-auto --apache

Or just get a certificate:

sudo /usr/local/bin/certbot-auto certonly --apache

Automatic renewal: (crontab)

echo "0 0,12 * * * root python -c 'import random; import time; time.sleep(random.random() * 3600)' && /usr/local/bin/certbot-auto renew" | sudo tee -a /etc/crontab > /dev/null

ref: https://certbot.eff.org/lets-encrypt/centos6-apache

Renewal

/path/to/certbot-auto renew --dry-run
/path/to/certbot-auto renew

Autoamted Renewal:

0 0,12 * * * python -c 'import random; import time; time.sleep(random.random() * 3600)' && /path/to/certbot-auto renew

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/test.t0e.org/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/test.t0e.org/privkey.pem
   Your cert will expire on 2019-04-30. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again with the "certonly" option. To non-interactively renew *all*
   of your certificates, run "certbot-auto renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le