upstream app01 {
	least_conn;
	server localhost:9001 weight=5;
	server localhost:9002;
	server localhost:9003 backup;
}


upstream app02 {
	ip_hash;
	server localhost:9004 weight=5;
	server localhost:9005;
	server localhost:9006 down;
}


server {
	listen [::]:80 default_server;
	listen 80 default_server;
	server_name _;
	location /app01 {
		proxy_pass http://app01;
	}
	location /app02 {
		proxy_pass http://app02;
	}
}


# server 01
server {
	listen [::]:9001;
	listen 9001;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 01";
}


# server 02
server {
	listen [::]:9002;
	listen 9002;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 02";
}


# server 03
server {
	listen [::]:9003;
	listen 9003;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 03";
}


# server 04
server {
	listen [::]:9004;
	listen 9004;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 04";
}


# server 05
server {
	listen [::]:9005;
	listen 9005;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 05";
}


# server 06
server {
	listen [::]:9006;
	listen 9006;
	server_name _;
	add_header Content-Type "text/plain";
	return 200 "hello world: server 06";
}

docker run --detach --name nginx-load-balancer \
    --volume "${PWD}/load-balancer.conf:/etc/nginx/conf.d/default.conf" \
    --publish "8080:80" \
    --workdir "/usr/share/nginx/html/" \
    nginx
curl -SsD- http://localhost:8080/app01;
curl -SsD- http://localhost:8080/app02;
docker stop nginx-load-balancer
docker rm nginx-load-balancer