This container is made from python:3.11-alpine with nginx and certbot.

This container allows you to proxy hosts and obtain valid LetsEncrypt certificates with only a JSON string or hand written nginx configuration files.

Staging: By default the container will fetch staging certificates. You must specify -e PRODUCTION=true to have the container obtain legitimate certificates. I recommend testing with -e PRODUCTION=false first to ensure your setup is working. Testing via the production environment can result in rate limiting or temporary bans from LetsEncrypt servers.

Example

Simple proxying without pods

podman network create proxy

Add a webserver

podman run -d --network proxy --name webserver httpd

Run the nginx-certbot container

podman run -d \
    -p 80:80 -p 443:443 \
    -e PRODUCTION=false \
    -e HOSTS='[{"hostname":"contoso.com","proxy_pass":"http://webserver"}]' \
    -e EMAIL=admin@contoso.com \
    --network proxy \
    --name proxy pipeittodevnull/nginx-certbot:latest

Prefered setup: The proxy is not in a pod while proxying multiple pods

Setup 2 pods and a proxy network

• A shared network between containers is required for DNS resolution and communications. If you have a webserver and a database serving it, only the webserver is put on the proxy network.

podman pod create web0
podman pod create web1
podman network create proxy

Add webservers to the pods(httpd and nginx are used to have a visible difference in the resulting webpages)

podman run -d --pod web0 --network proxy --name webserver0 httpd
podman run -d --pod web1 --network proxy --name webserver1 nginx

Run the nginx-certbot container

podman run -d \
    -p 80:80 -p 443:443 \
    -e PRODUCTION=false \
    -e HOSTS='[{"hostname":"site0.contoso.com","proxy_pass":"http://web0:8080"},{"hostname":"site1.contoso.com","proxy_pass":"http://web1:8081"}]' \
    -e EMAIL=admin@contoso.com
    --network proxy \
    --name proxy pipeittodevnull/nginx-certbot:latest

Using manual configuration files

If you have a complex setup that is more than basic ports, such as needing to pass websockets, this would be the method.

Setup 2 pods and a proxy network

• A shared network between containers is required for DNS resolution and communications. If you have a webserver and a database serving it, only the webserver is put on the proxy network.

podman pod create web0
podman pod create web1
podman network create proxy

Add webservers to the pods(httpd and nginx are used to have a visible difference in the resulting webpages)

podman run -d --pod web0 --network proxy --name webserver0 httpd
podman run -d --pod web1 --network proxy --name webserver1 nginx

Configure your site file conf.d/site.conf (You can use one file, or put each server in its own)

server {
  listen 80;
  server_name site0.contoso.com;
  location / {
      proxy_pass http://web0:8080/;
  }
}
server {
  listen 80;
  server_name site1.contoso.com;
  location / {
      proxy_pass http://web1:8081/;
  }
}

Run the nginx-certbot container

podman run -d \
    -p 80:80 -p 443:443 \
    -v ./conf.d:/etc/nginx/conf.avail \
    -e PRODUCTION=false \
    -e HOSTS='[{"hostname":"site0.contoso.com"},{"hostname":"site1.contoso.com"}]' \
    -e EMAIL=admin@contoso.com
    --network proxy \
    --name proxy pipeittodevnull/nginx-certbot:latest

Useful docs

• https://www.redhat.com/sysadmin/container-networking-podman

Building the container

podman build -t nginx-certbot:latest .