Accessing Docker from host network using domain name - docker

Question

hey guys I have a docker container A with a domain name attached to it on a host B with a domain name attached to it as well.....how can I access the said container A via A's domain name rather than an B's ip address or domain name from computer C on the host B's local network.
thus C -> A( via wwww.cname.url) rather than C -> B( www.bname.url:port) -> A
E.G.
the following is a docker-compose with services
version: "3.2"
services:
php:
links:
- mysql
image: arm32v6/php:7.1.24-fpm-alpine3.8-lavalite
networks:
- backend
working_dir: /var/www/html
volumes:
- ./website/:/var/www/html/
privileged: true
node:
domainname: docker.local
hostname: node
networks:
frontend:
aliases:
- node.docker.local
links:
- "apache:dev.docker.local"
depends_on:
- apache
image: arm32v7/node:latest
entrypoint: yarn
command: twill-dev
volumes:
- ./website:/usr/src/app
working_dir: /usr/src/app
ports:
- "3000:3000"
- "3001:3001"
apache:
domainname: docker.local
hostname: dev
image: arm32v7/httpd:2.4
depends_on:
- php
- mysql
networks:
frontend:
aliases:
- apache
- dev.docker.local
backend:
aliases:
- apache
privileged: true
ports:
- "8880:80"
working_dir: /var/www/html
volumes:
- ./website/:/var/www/html/
- ./httpd.conf:/usr/local/apache2/conf/httpd.conf
- ./fpm.conf:/usr/local/apache2/conf/extra/httpd-vhosts.conf
mysql:
image: yobasystems/alpine-mariadb:arm32v7
volumes:
- ./datadir:/var/lib/mysql
networks:
- backend
environment:
- MYSQL_VERSION=5.7
- MYSQL_ROOT_PASSWORD=rootpassword
- MYSQL_USER=test
- MYSQL_PASSWORD=testpass
- MYSQL_DATABASE=test_db
networks:
frontend:
external:
name: localnet
backend:
I want to be able to access service apache by its domain name set to dev.docker.local the ip of which is on a network 17.18.0.1/24
The host has an IP which is on a network 192.168.1.0/24 with a domain name dev.server.local
I have a dev pc on the network 192.168.1.0/24 and it can access the service containers via the hosts IP and usually a port exposed for the particular service.
UPDATE
The host can be reached at server.local from outside the network
my network interface has the following entries
dns-search server.local
dns-domain server.local
the docker container has the following
hostname nginx
domainname server.local
do I need to also edit a host file or resolv.conf file?
It seems the host is running avahi service discovery. Would this affect anything?
So can I
set an internal domain set to the host and have docker containers on subdomains? How would outside devices access this via the domain?
attach the docker container to be on the host's network thus having an ip in the 192.168.1.0/24 and being able to be pinged by devices on that network as well. Will the domain resolve to it?
Is there a dynamic DNS software I can use that can hook this up to me so that its not a manual process. Thus it will detect the server and route incoming requests to it via the domain name?

Answer 1

You can do this by configuring an nginx container with the containers bound to the subdomain.
So for example the host is accessible by domain example.com and you want the php container to be accessible on php.example.com you could use a setup like the following:
services:
php:
image: arm32v6/php:7.1.24-fpm-alpine3.8-lavalite
environment:
- VIRTUAL_HOST=php.example.com
nginx-proxy:
image: jwilder/nginx-proxy
depends_on:
- php
ports:
- "80:80"
- "443:443"
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
Any request to the subdomain would first be send to the host, this is bound by nginx, which in turn registers that because the subdomain php is requested it should send the user to that container.
I hope this can help you and if you have any questions please let me know