Deploy multiple apps on one droplet?

Question

DigitalOcean

I'm immersed in the topic of deployment. I understand that you can have several applications on one droplet, each of which will be tied to its own domain. So far I don’t quite understand how it works - after all, there is only one external ip, the port too.

I assume this is all configurable in nginx? If so, does anyone have a good guide on setting it up? I watched enough lessons, I set it up myself about 10 times, but in my head it still remains magic and there is no understanding of what and why.

Can Nginx run in a container too? For two applications will there be one container with nginx or for each application? In general, I'm very noob in devops and I want to fix it)

Answer 1

As an option:
nginx on the main system:

./nginx/sites-enabled/site1.conf:
{
  listen 80;
  server_name site1.example.org;

  location / {
     proxy_pass: http://127.0.0.1:8081;
 }

}

./nginx/sites-enabled/site2.conf:

{
  listen 80;
  server_name site2.example.org;

  location / {
     proxy_pass: http://127.0.0.1:8082;
 }
}

Containers for site1:
docker-compose.yml

nginx:
    volumes:
        - ./:/opt/site1-root
        - ./config/nginx:/etc/nginx/conf.d
    ports:
      - "0.0.0.0:8081:80"

./conf/nginx/site1_local.conf

{
   listen 80;
   
   local / {
       root  /opt/site1-root;
   }
}

Containers for site2:
docker-compose.yml

nginx:
    volumes:
        - ./:/opt/site2-root
        - ./config/nginx:/etc/nginx/conf.d
    ports:
      - "0.0.0.0:8082:80"

./conf/nginx/site2_local.conf

{
   listen 80;
   
   local / {
       root  /opt/site2-root;
   }
}

You can do without nginx in containers, and immediately bind the port to the main system nginx, you can make your own network - depending on what is running and how it is organized.

Answer 2

jwilder / nginx or some kind of traefic is put in front, which itself picks up the configuration from the environment variables of running containers and sorts virtual hosts into different containers.