Question

Spawning multiple droplets (microservices) accessible by IP address, how to secure traffic by SSL?

Posted March 6, 2021 371 views
SecurityMicroservices

Hello,
I have the solution that creates and destroys droplets whenever needed - multiple $5 instances that live for a couple of hours max.
When these droplets are created - the application installed there immediately notifies my “service discovery” about their IP addresses. My admin/master application can query service discovery - obtain their IP and send them a task to perform.

Service discovery and master application are accessible by domains/subdomains, and these have their Let’s encrypt certificate set.

The problem is - how my master application can speak to these droplets in a secure way. The IP constantly changes as droplets are destroyed and recreated (from snapshot).

Do I need to write a script that creates a self-signed certificate during power up?

I’m aware of private IPs, but worker droplets can be created in different data centers.

Appreciate ideas

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1 answer

Hi there,

I could suggest two things in this case:

  • One option is to add the Droplets behind a load balancer for example and do the SSL termination there. That way you will not have to add an SSL certificate to each Droplet.

  • An alternative solution is to either as you mentioned generate a self-signed SSL and add it to the new Droplets, or have the certificate already generated and stored in your snapshot so that you don’t have to generate a new certificate each time.

  • A third option is to have an Ansible playbook that adds the certificate to the new Droplets once they are created.

Hope that this helps!
Regards,
Bobby

  • Thanks Bobby,

    “An alternative solution is to either as you mentioned generate a self-signed SSL and add it to the new Droplets, or have the certificate already generated and stored in your snapshot so that you don’t have to generate a new certificate each time.”

    after the droplet is destroyed and recreated from the snapshot it will have the new IP - so how can I rely on the certificate from the snapshot?

    I will read about other optioins.

    • Hi there,

      Yes indeed, this option would work in case that you have a domain name and the certificate secures the domain name rather than the individual IP addresses.

      Regards,
      Bobby