Renewing Lets Encrypt Certificates Behind a Proxy: A Comprehensive Guide
Lets Encrypt is a popular certificate authority that provides free SSL/TLS certificates. If you're running a website behind a proxy, such as WAN → pfSense → Ubuntu 18.04 → haproxy → certbot v0.27.0 (renewal), you may encounter some challenges when it comes to renewing your certificates.
Understanding the Setup
In this setup, pfSense is forwarding TCP traffic to Ubuntu 18.04, which is running haproxy and certbot v0.27.0. The certbot package is used to obtain and renew Lets Encrypt certificates. However, because the traffic is coming from behind a proxy, there are some additional steps that need to be taken in order to successfully renew the certificates.
Renewing the Certificates
To renew the certificates, you'll need to run the certbot renew command. However, because the traffic is coming from behind a proxy, you'll need to specify the --proxy option and point it to the address of the proxy. For example:
sudo certbot renew --proxy pfSense\_address
Where pfSense\_address is the IP address or hostname of the pfSense box.
Automating the Renewal Process
To automate the renewal process, you can set up a cron job to run the certbot renew command at regular intervals. For example, to run the command every day at 3am, you can add the following line to your crontab:
0 3 * * * sudo certbot renew --proxy pfSense\_address
Troubleshooting
If you encounter any issues with the renewal process, there are a few things you can check:
- Make sure that the proxy is properly forwarding traffic to the Ubuntu 18.04 box.
- Check the certbot logs for any error messages.
- Make sure that the certificates have not already been renewed within the past 30 days. Lets Encrypt only allows you to renew certificates once every 30 days.
References
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