Setting up Let's Encrypt certbot (ver. 0.22.0, will be upgraded to 0.23.0 at later stage)

# cd /root/
# mkdir -p /root/lets-encrypt/certbot
# cd /root/lets-encrypt/certbot
# wget https://dl.eff.org/certbot-auto
# chmod a+x certbot-auto
# ./certbot-auto --apache certonly

Enter email address (used for urgent renewal and security notices) (Enter 'c' to cancel):


IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/HOSTNAME.DOMAIN.COM/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/HOSTNAME.DOMAIN.COM/privkey.pem
   Your cert will expire on 2018-07-04. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again. To non-interactively renew *all* of your certificates, run
   "certbot-auto renew"

   
/etc/letsencrypt/live/HOSTNAME.DOMAIN.COM/cert.pem
/etc/letsencrypt/live/HOSTNAME.DOMAIN.COM/privkey.pem
/etc/letsencrypt/live/HOSTNAME.DOMAIN.COM/chain.pem

***HOSTNAME.DOMAIN.COM = your domain's hostname

Automatic renewal:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Test automatic renewal for your certificates by running this command: 
# ./certbot-auto renew --dry-run

If it appears to be working correctly,you may get "Congratulations" notes at the end of dry-run.
++++++++++++++++++++++++++++++++++++++++++++++++++
......
......
Congratulations, all renewals succeeded. The following certs have been renewed:
  /etc/letsencrypt/live/ns1.hawkdns.net/fullchain.pem (success)
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates above have not been saved.)
-------------------------------------------------------------------------------
++++++++++++++++++++++++++++++++++++++++++++++++++



Set up cronjob to automatically renew:

For CentOS-7:
#30 1 * * * /root/lets-encrypt/certbot/certbot-auto renew --renew-hook "systemctl restart httpd"
#* 0 * * * /root/scripts/dump-all-db.sh > /dev/null 2>&1
#0 0,12 * * * cd /root/lets-encrypt/certbot/ && ./certbot-auto renew --renew-hook && systemctl restart httpd
0 0,12 * * *  /root/lets-encrypt/certbot/certbot-auto renew --renew-hook "systemctl restart httpd"

For CentOS-6:
0 0,12 * * * /root/lets-encrypt/certbot/certbot-auto renew --renew-hook "service httpd restart"