Migrating multi container workloads

[shainegordon]

I've successfully migrated a number of single container applications from AWS Fargate to EC2/Kamal

Now I'm trying to plan how best to migrate multi-container workloads

Our general architecture is:
nginx as a reverse proxy
a UI framework (Nextjs or Remix) as a "BFF"
an API

the API cannot be 100% private, it's handling all the OAuth2 callbacks, and changing this will be complicated.

our current AWS architecture is

Cloudfront -> ALB -> Fargate (nginx) -> nginx handles reverse proxy on the internal docker network

nginx.conf looks like this

server {
  listen 80;
  server_tokens off;

  large_client_header_buffers 4 32k;

  location ~ (/signin-[^/]+|/_health|/api|/auth|/connect) {
    proxy_pass http://localhost:5000;
    proxy_set_header Host $host;
    proxy_set_header Connection close;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Host $server_name;
    proxy_set_header X-Forwarded-Proto "https";
  }

  location / {
    proxy_pass http://localhost:3000;
    proxy_set_header Host $host;
    proxy_set_header Connection close;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Host $server_name;
    proxy_set_header X-Forwarded-Proto "https";
  }

  include /etc/nginx/extra-conf.d/*.conf;
}

as I understand, I could using nginx as the service, and the the API and UI are "accessories"

This doesnt feel correct to me, because from what I can read kamal deploy does not include accessories (if they are already running)

Lets also assume that I want to run everything on a single EC2 instance