Docker: Nginx Container로 proxy 변경해서 Load balancer 구성하기

Host nginx reverse proxy

sudo apt update
sudo apt -y install nginx
sudo nginx -v

docker run -dit -e SERVER_PORT=5001 -p 5001:5001 -h alb-node01 -u root --name=alb-node01 dbgurum/nginxlb:1.0
docker run -dit -e SERVER_PORT=5002 -p 5002:5002 -h alb-node02 -u root --name=alb-node02 dbgurum/nginxlb:1.0
docker run -dit -e SERVER_PORT=5003 -p 5003:5003 -h alb-node03 -u root --name=alb-node03 dbgurum/nginxlb:1.0

Host nginx reverse proxy 구성

~$ sudo mv /etc/nginx/nginx.conf /etc/nginx/nginx.conf.org

~$ sudo vi /etc/nginx/nginx.conf
events { worker_connections 1024; }
http {
	# List of application servers
    upstream backend-alb {
    	server 127.0.0.1:5001;
        server 127.0.0.1:5002;
        server 127.0.0.1:5003;
    }
    # Configuration for the server
    server {
    	# Running port
        listen 80 default_server;
        # Proxying the connections
        location / {
        	proxy_pass	http://backend-alb;
        }
    }
}
~$ sudo systemctl restart nginx.service
~$ sudo systemctl status nginx.service

nginx container reverse proxy 구성

docker run -d -p 8001:80 --name=proxy-container nginx:1.25.0-alpine

~$ vi nginx.conf
events { worker_connections 1024; }
http {
	upstream backend-alb {
    	server 192.168.56.101:5001;
	    server 192.168.56.101:5002;
    	server 192.168.56.101:5003;
    }
    server {
    	listen 80 default_server;
	    location / {
    		proxy_pass	http://backend-alb;
        }
    }
}
~$ docker cp nginx.conf proxy-container:/etc/nginx/nginx.conf

~$ sudo netstat -nlp | grep 8001
docker restart proxy-container
docker ps | grep proxy
curl localhost:8001