Docker service redirection based on url path - docker

Question

I am using docker swarm and deploying 3 tomcat services each of the running on 8443 within the container and on 8444,8445,8446 on host containers.
I am looking to use a proxy server running on 8443 which will redirect the incoming request to the corresponding service based on the url path
https://hostname:8443/a – > https://hostname:8444/a
https://hostname:8443/b – > https://hostname:8445/b
https://hostname:8443/c – > https://hostname:8446/c
My sample Docker-compose file
version: "3"
services:
tomcat1 :
image: tomcat:1
ports:
- "8446:8443"
tomcat2 :
image: tomcat:1
ports:
- "8444:8443"
tomcat3 :
image: tomcat:1
ports:
- "8445:8443"
I have explored traeffik and nginx but was not able to find to re route based on url. Any suggestions.

Answer 1

You could use traefik based in rule with labels Host and Path
http://docs.traefik.io/basics/#frontends
Something like
version: "3"
services:
traefik:
image: traefik
command: --web --docker --docker.swarmmode --docker.watch --docker.domain=hostname
ports:
- "80:80"
- "8080:8080"
- "443:443"
volumes:
- /var/run/docker.sock:/var/run/docker.sock
deploy:
placement:
constraints: [node.role == manager]
restart_policy:
condition: on-failure
tomcat1:
image: tomcat:1
labels:
- traefik.backend=tomcat1
- traefik.frontend.rule=Host:hostname;PathPrefixStrip:/a
- traefik.port=8443

Answer 2

You can try the way I did it using nginx.
ON UBUNTU
Inside the /etc/nginx/sites-available you will find the default file.
Inside the server block add a new location block.
server {
listen 8443;
#this is a comment
location /a {
proxy_pass http://[::]:8444/.;
#i have commented these out because i don't know if you need them
#proxy_http_version 1.1;
#proxy_set_header Upgrade $http_upgrade;
#proxy_set_header Connection keep-alive;
#proxy_set_header Host $host;
#proxy_cache_bypass $http_upgrade;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
#proxy_set_header X-Forwarded-Proto $scheme;
}
location /b {
proxy_pass http://[::]:8445/.;
}
location /c {
proxy_pass http://[::]:8446/.;
}
}