Setting up TLS SSL certificates Let's Encrypt for ERPNext sites

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Using Let's Encrypt to setup HTTPS

##Prequisites
  1. You need to have a DNS Multitenant Setup
  2. Your site should be accessible via a valid domain
  3. You need root permissions on your server
Note : Let's Encrypt Certificates expire every three months

Using Bench Command

Just run:
sudo bench setup lets-encrypt [site-name]
You will be faced with several prompts, respond to them accordingly. This command will also add an entry to the crontab of the user that will attempt to renew the certificate every month.
To renew certificates manually you can use:
sudo bench renew-lets-encrypt

Manual Method

Download the appropriate Certbot-auto script into /opt

https://certbot.eff.org/

Stop nginx service

$ sudo service nginx stop

Run Certbot

$ ./opt/certbot-auto certonly --standalone
After letsencrypt initializes, you will be prompted for some information. This exact prompts may vary depending on if you've used Let's Encrypt before, but we'll step you through the first time.
At the prompt, enter an email address that will be used for notices and lost key recovery:
Then you must agree to the Let's Encrypt Subscribe Agreement. Select Agree:
Then enter your domain name(s). Note that if you want a single cert to work with multiple domain names (e.g. example.com and www.example.com), be sure to include all of them:

Certificate Files

After obtaining the cert, you will have the following PEM-encoded files:
  • cert.pem: Your domain's certificate
  • chain.pem: The Let's Encrypt chain certificate
  • fullchain.pem: cert.pem and chain.pem combined
  • privkey.pem: Your certificate's private key
These certificates are stored under /etc/letsencrypt/live/example.com folder

Configure the certificates for your site(s)

Go to your erpnext sites site_config.json
$ cd frappe-bench/sites/{{site_name}}
Add the following two lines to your site_config.json
"ssl_certificate": "/etc/letsencrypt/live/example.com/fullchain.pem",
"ssl_certificate_key": "/etc/letsencrypt/live/example.com/privkey.pem"
Regenerate the nginx configuration
$ bench setup nginx
Restart the nginx server
$ sudo service nginx restart

Auto renewal (experimental)

Login as root or a user with superuser privileges, run crontab -e and enter:
# renew letsencrypt certificates on 1st monday of every month and get an email if it gets executed
MAILTO="mail@example.com"
0 0 1-7 * * [ "$(date '+\%a')" = "Mon" ] && sudo service nginx stop && /opt/certbot-auto renew && sudo service nginx start


Source: https://github.com/frappe/erpnext/wiki/Setting-up-TLS-SSL-certificates-Let's-Encrypt-for-ERPNext-sites
Community Forum: https://discuss.erpnext.com/
ERPNext Hosting

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