Problema para configurar docker + ngnix + .netcore2.1

Bom dia. Recentemente fiz o curso Docker aqui na alura e resolvi fazer um desafio para mim. Vou levantar um cluster com .netcore2.1 usando o ngnix para fazer o balancer

Até então beleza, mas estou com problema para fazer funcionar o nginx, quando uso o comando

docker-compose up -d

tenho o seguinte erro

Attaching to nginx
nginx    | 2018/06/29 13:24:01 [emerg] 1#1: unknown directive "worker_processes" in /etc/nginx/nginx.conf:1
nginx    | nginx: [emerg] unknown directive "worker_processes" in /etc/nginx/nginx.conf:1
nginx exited with code 1

Dockerfile nginx

FROM nginx:latest
MAINTAINER Carlos Smolareck
RUN rm /etc/nginx/conf.d/default.conf
COPY /docker/nginx.conf /etc/nginx/nginx.conf
EXPOSE 80
ENTRYPOINT ["nginx"]
# Parametros extras para o entrypoint
CMD ["-g", "daemon off;"]

nginx.conf

worker_processes 4;

events { worker_connections 1024; }

http {    
        proxy_cache_path        /var/cache/nginx levels=1:2 keys_zone=one:8m max_size=3000m inactive=600m;
        proxy_temp_path         /var/tmp;
        include                 mime.types;
        default_type            application/octet-stream;
        sendfile                on;
        keepalive_timeout       65;

        gzip                    on;
        gzip_comp_level         6;
        gzip_vary               on;
        gzip_min_length         1000;
        gzip_proxied            any;
        gzip_types              text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
        gzip_buffers            16 8k;

        upstream api-netcore {
              least_conn;

              server node1:8080 weight=10 max_fails=3 fail_timeout=30s;
              server node2:8080 weight=10 max_fails=3 fail_timeout=30s;
              server node3:8080 weight=10 max_fails=3 fail_timeout=30s;

              keepalive 64;
        }

        server {
              listen 80; 

              server_name 0.0.0.0;

              location / {
                  proxy_pass            http://api-netcore;
                  proxy_http_version    1.1;
                  proxy_set_header      Upgrade $http_upgrade;
                  proxy_set_header      Connection 'upgrade';
                  proxy_set_header      Host $host;
                  proxy_set_header      X-Real-IP            $remote_addr;
                  proxy_set_header      X-Forwarded-For  $proxy_add_x_forwarded_for;
                  proxy_set_header      X-NginX-Proxy    true;
                  proxy_cache_bypass    $http_upgrade;
              }

              #return  301 https://$server_name$request_uri;
        }
}

docker-compose.yaml

version: '3'
services:
    nginx:
        build:
            dockerfile: ./docker/nginx.dockerfile
            context: .
        container_name: nginx
        ports:
            - "8000:80"
        networks: 
            - production-network
        depends_on: 
            - "node1"
            - "node2"
            - "node3"

    node1:
        build:
            dockerfile: ./docker/api.dockerfile
            context: .
        container_name: api-1
        ports:
            - "8080"
        networks: 
            - production-network

    node2:
        build:
            dockerfile: ./docker/api.dockerfile
            context: .
        container_name: api-2
        ports:
            - "8080"
        networks: 
            - production-network

    node3:
        build:
            dockerfile: ./docker/api.dockerfile
            context: .
        container_name: api-3
        ports:
            - "8080"
        networks: 
            - production-network

networks: 
    production-network:
        driver: bridge

Obs: a parte do .netcore2.1 esta funcionando certinho