NGINX container as a proxy for other docker containers - docker

Question

I have bind9 DNS server running as a container, and is mapped to port 53003 on the docker host:
version: "3"
services:
DNS-SRV:
container_name: DNS-SRV
image: ubuntu/bind9
ports:
- "53003:53"
environment:
- TZ=UTC
volumes:
- ~/core/bind9/:/etc/bind/
and I wonder if I can use NGINX server as a proxy for it and other containerized services, here is my nginx.config file:
events {
worker_connections 1024;
}
stream {
upstream dns_servers {
server <docker_hostIP>:53003;
}
server {
listen 53 udp;
listen 53; #tcp
proxy_pass dns_servers;
error_log /var/log/nginx/dns.log info;
proxy_responses 1;
proxy_timeout 1s;
}
}
What I'm trying to do is to map any dns requests for the docker host on port 53 to port 53003, I'm not sure if there is another way:
Client -- DNS request ---> 53 (( [ NGINX ] --> 53003:53 ))
My setup isn't working, I'm testing it by doing nslookup like this:
# nslookup <domain> <docker_hostIP>
but I'm getting connection timed out, what could be the issue?

Answer 1

You could do this?
Create a docker-compose incorporating both services
version: "3"
services:
DNS-SRV:
container_name: DNS-SRV
image: ubuntu/bind9
environment:
- TZ=UTC
volumes:
- ~/core/bind9/:/etc/bind/
NGINX:
image: nginx:alpine
ports:
- "53:53/udp"
- "53:53/tcp"
volumes:
- ./nginx.conf:/etc/nginx/nginx.conf
depends_on:
- "DNS-SRV"
Then in your nginx.conf do something like this?
events {
worker_connections 1024;
}
stream {
upstream dns_servers {
server DNS-SRV:53;
}
server {
listen 53 udp;
listen 53; #tcp
proxy_pass dns_servers;
error_log /var/log/nginx/dns.log info;
proxy_responses 1;
proxy_timeout 1s;
}
}