After I deploy to docker hub, now I will try to run multiple containers of the same docker image. I will use Nginx image to create a reverse proxy server to do load balance.
And Nginx provides default access log for all incoming requests.
mkdir try-reverse-proxy
cd try-reverse-proxy
touch docker-compose.yml
version: "3.9"
services:
nginx:
image: nginx:latest
restart: always
volumes:
- "./nginx.conf:/etc/nginx/nginx.conf"
ports:
- "8000:80"
serverone:
image: nuttawut503/mydocker:1.0
environment:
- name=Ant
servertwo:
image: nuttawut503/mydocker:1.0
environment:
- name=Bird
serverthree:
image: nuttawut503/mydocker:1.0
environment:
- name=Cat
I use three duplicated Go server with different name environment and there is only Nginx that expose on port 8000.
Before run this docker compose, create nginx.conf file
worker_processes auto;
events {}
http {
upstream apiserver {
server serverone:8080;
server servertwo:8080;
server serverthree:8080;
}
server {
listen 80;
location / {
proxy_pass http://apiserver;
}
}
}
I have created an upstream and register the three Go server. When you send a request to whatever paths to Nginx, the Nginx will transfer the request to those three server.
docker compose up
Try to access to localhost:8000, the first response will be from the first server and next will be the second's and then from the third. Nginx will send requests to the three servers equally (round-robin). To find more about the load balancer, check this
sources