Link 1 server with 2 domains - docker

Question

I have one physical server with Docker, my docker run 2 containers, two web app in two différents ports
I also have two domains.
Can I link my domains one by web app ?
Thanks you !

Answer 1

Yes, you can. You can put a reverse proxy that routes traffic based on the domain name in front of the 2 containers.
As an example, let's create 2 simple Dockerfiles to simulate your 2 apps. I'll use Nginx as it's a very simple way to create a web server. Don't get hung up on the fact that I use Nginx here. This should be your web app containers.
Dockerfile1:
FROM nginx
RUN echo 'hello from container 1' > /usr/share/nginx/html/index.html
and Dockerfile2:
FROM nginx
RUN echo 'hello from container 2' > /usr/share/nginx/html/index.html
Then we'll create a docker-compose file to run the 2 containers, along with a reverse proxy.
docker-compose.yml:
version: '3'
services:
app1:
build:
context: .
dockerfile: ./Dockerfile1
app2:
build:
context: .
dockerfile: ./Dockerfile2
reverseproxy:
image: nginx
ports:
- 8080:80
volumes:
- ./nginx.conf:/etc/nginx/nginx.conf
And finally, the nginx.conf file that configures nginx to route traffic for 'domain1.com' to the 'app1' container and traffic for 'domain2.com' to 'app2'.
nginx.conf:
events { }
http {
server {
listen 80;
server_name domain1.com;
location / {
proxy_pass http://app1/;
}
}
server {
listen 80;
server_name domain2.com;
location / {
proxy_pass http://app2/;
}
}
}
Now you can start up all 3 containers using
docker-compose up -d
and send a request to each container using
curl -H "Host: domain1.com" http://localhost:8080
curl -H "Host: domain2.com" http://localhost:8080
And the responses will come from the two different containers.