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Let's Encrypt Wildcard With Docker

Posted June 3, 2020 3.9k views
APIDockerLet's Encrypt

Hello guys.
I was following this tutorial How To Secure a Containerized Node.js Application with Nginx, Let’s Encrypt, and Docker Compose, which is very complete and easy to go through. But, what if I want to create a wildcard certificate with Let’s Encrypt to deploy along with all my API? How difficult would it be to adapt the instructions from this article? By the way, this wildcard certificate would be valid to a web server as well, right?

Best regards

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renatospaka
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renatospaka

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2 answers
bobbyiliev June 4, 2020

Hi there @renatospaka,

I believe that in order to obtain a wildcard SSL certificate you would have to adjust the following line in your docker-compose file:

    command: certonly --webroot --webroot-path=/var/www/html --email sammy@example.com --agree-tos --no-eff-email --force-renewal -d example.com -d www.example.com

And set it to:

    command: certonly --webroot --webroot-path=/var/www/html --email sammy@example.com --agree-tos --no-eff-email --force-renewal -d example.com -d *.example.com

This would generate a wildcard SSL certificate which you could use for all of your subdomains.

Hope that this helps!
Regards,
Bobbt

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renatospaka June 4, 2020

Hello @bobbyiliev

Thanks for your reply. Another question: can I create an isolated container only for certbot certificate information and associate it with a docker-compose when needed?

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  • bobbyiliev June 4, 2020

    Hi there @renatospaka,

    I believe that this should be OK, you just need to be careful with step 6 in this case which is the certificate renewal cronjob as it actually uses the same docker-compose file.

    Hope that this helps!

    Regards,
    Bobby

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