Comandos

-> Load Image
   docker-compose up -d

-> docker-compose exec nginx apk add bash //Install Bash
-> docker-compose exec nginx bash //Open Bash
-> apk add vim  //Install Vim(Editor)

Default Files Nginx Config:
    -> Inside bash: vim /etc/nginx/nginx.conf  //Main
    -> Inside bash: vim /etc/nginx/conf.d/default.conf //Secundary -> Edit
    -> nginx -t //Check file

In Node1 Server:

    -> docker-compose up -d
    -> docker-compose exec node1 apk add bash vim
    -> docker-compose exec node1 bash
    -> Inside Bash: vim /usr/share/nginx/html/index.html:
        -> <h1>Node1</h1>

In Nginx Server
    
    -> Inside bash: vim /etc/nginx/conf.d/default.conf :
            location / {
                proxy_pass http://node1;
            }
        -> nginx -t
        -> nginx -s reload


In Node2 Server:

    -> docker-compose up -d
    -> docker-compose exec node2 apk add bash vim
    -> docker-compose exec node2 bash
    -> Inside Bash: vim /usr/share/nginx/html/index.html:
        -> <h1>Node2</h1>

In Nginx Server
    
    -> Inside bash: vim /etc/nginx/conf.d/default.conf :
            upstream nodes{ //LoadBalancer
                server node1 weight=2; //Definindo o peso do servidor (Para mais requisições)
                server node2;
            }
            server{
                location / {
                    proxy_pass http://nodes; //LoadBalancer Serve
                }
                ...
            }
        -> nginx -t
        -> nginx -s reload