Setting up Let's Encrypt SSL with Caddy and Serving Multiple Services using Docker Containers on Vault Warden

Setting Let's Encrypt SSL with Caddy and Vault Warden for Multiple Services in Docker Containers

In this article, we will explain how to set up Let's Encrypt SSL certificates for multiple services running in Docker containers using Caddy and Vault Warden. By the end of this guide, you will have a good understanding of how to manage and secure your services with these tools.

What is Caddy?

Caddy is an open-source, automatic HTTPS web server that makes it easy to set up and manage your websites. Caddy takes care of obtaining SSL certificates, renewing them automatically, and handling the encryption and decryption of website traffic. It's a great tool for managing SSL certificates for multiple services, and it has a powerful and flexible configuration system.

What is Vault Warden?

Vault Warden is a self-hosted, open-source implementation of HashiCorp's Vault. Vault is a secrets management tool that allows you to securely store, manage, and distribute secrets, such as API keys, passwords, and certificates, across your organization. Vault Warden allows you to run your own Vault server on your local network, making it easy to manage your secrets and SSL certificates for your services.

Managing SSL Certificates with Caddy

Caddy makes it easy to set up and manage SSL certificates for your services. To get started, you will need to install Caddy on your server and create a configuration file. Here's an example of a simple Caddy configuration file that sets up HTTPS for a single service:

example.com {
 reverse_proxy localhost:8080
 tls example.com
}

This configuration sets up a reverse proxy for traffic directed at example.com and enables HTTPS for that domain. Caddy will automatically obtain and manage an SSL certificate for example.com, so you don't have to worry about manually renewing the certificate or configuring the encryption and decryption of traffic.

Managing SSL Certificates with Vault Warden

Vault Warden makes it easy to manage SSL certificates for your services. To get started, you will need to install Vault Warden on your server and create a configuration file. Here's an example of a simple Vault Warden configuration file:

{
 "backend": {
 "path": "vaultwarden"
 },
 "default_lease_ttl": "30m",
 "max_lease_ttl": "4h"
}

This configuration sets up a Vault Warden server with a backend path of vaultwarden, and sets default and maximum lease times. With Vault Warden, you can manage secrets, including SSL certificates, and distribute them securely across your organization.

Combining Caddy and Vault Warden for Multiple Services

Now that you know how to set up and manage SSL certificates with Caddy and Vault Warden, you can combine the two tools to manage certificates for multiple services in Docker containers. Here's an example of how to set this up:

• Create Docker containers for your services.
• Use a reverse proxy, such as Caddy, to route traffic to your services.
• Use Vault Warden to manage and distribute SSL certificates for your services.

Example

Here's an example of a Docker Compose file that sets up a Caddy reverse proxy and several services:

version: "
 3.8"
 services:
 caddy:
 image:
 caddy/caddy
 ports:
 - 80:80
 - 443:443
 volumes:
 - ./Caddyfile:/etc/caddy/Caddyfile
 networks:
 - service-network
 
 service1:
 image:
 service1/service1
 ports:
 - "8080"
 networks:
 - service-network
 
 service2:
 image:
 service2/service2
 ports:
 - "8081"
 networks:
 - service-network
 
 networks:
 service-network:

And here's an example of a Caddyfile configuration that routes traffic to the services:

example.com {
 reverse_proxy service1:8080
 tls example.com
 }

 example.org {
 reverse_proxy service2:8081
 tls example.org
 }

With this setup, traffic directed at example.com will be routed to service1, and traffic directed at example.org will be routed to service2. In addition, SSL certificates will be managed and distributed using Vault Warden.

In this article, we've explained how to set up and manage SSL certificates for multiple services running in Docker containers using Caddy and Vault Warden. With these tools, you can secure your services and manage your SSL certificates in a simple and flexible way.

References

• Caddyfile documentation
• Vault documentation
• Vault PKI secrets engine documentation
• How to Set Up and Use HashiCorp Vault to Secure Secrets