Creating subdomain of different IP using Portainer, Nginx Proxy Manager and Oznu container

General Discussions
1

I have 2 servers:

Server1: doamin.app, www.domain.app on docker,portainer, NPM connecting to cloudflare via oznu container.

Server2: m.domain.app, apache2, dns-cloudflare-api.

To create a new subdomain, I had to deploy a new onzu stack, since it doesn’t let me create as many subdomains as I need in one yml file.

version: '2'
services:
  cloudflare-ddns:
    image: oznu/cloudflare-ddns:latest
    restart: always
    environment:
      - API_KEY=myAPI_key
      - ZONE=domain.app
      - SUBDOMAIN=m
      - PROXIED=true
      - e CRON=*/5 * * * *

On Cloudflare:
If I set:

A > domain.app > public IP1
A > domain.app > public IP2

without CNAME for m.domain.app, I get 523 error on server2, domain.app

This is what oznu does: overrides IP2, so origin is not reached.

[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] 30-cloudflare-setup: executing... 
DNS Zone: m.domain.app (2bxxxxxx9026363b71a762)
DNS Record: m.domain.app (xxxxxxxe381939a96f89ae)
[cont-init.d] 30-cloudflare-setup: exited 0.
[cont-init.d] 50-ddns: executing... 
Updating CloudFlare DNS record m.domain.app from 129.www.www.37 to 150.www.www.9...
CloudFlare DNS record m.domain.app (150.www.www.9) updated successfully.
[cont-init.d] 50-ddns: exited 0.
[cont-init.d] done.
[services.d] starting services
Starting crond...
crond: crond (busybox 1.31.1) started, log level 6
[services.d] done.
crond: USER root pid 246 cmd /etc/cont-init.d/50-ddns
No DNS update required for m.domain.app (150.www.www.9).
crond: USER root pid 261 cmd /etc/cont-init.d/50-ddns
Updating CloudFlare DNS record m.domain.app from 129.www.www.37 to 150.www.www.9...
CloudFlare DNS record m.domain.app (150.www.www.9) updated successfully.
crond: USER root pid 281 cmd /etc/cont-init.d/50-ddns
No DNS update required for m.domain.app (150.www.www.9).
crond: USER root pid 296 cmd /etc/cont-init.d/50-ddns
No DNS update required for m.domain.app (150.www.www.9).

If I set Cloudflare to a CNAME and point A record the same way, Oznu returns:

Updating CloudFlare DNS record m.domain.app from null to 150.www.www.9...
ERROR: Failed to update CloudFlare DNS record m.domain.app from null to 150.www.www.9

And server 2 returns error 504.

I have Nginx setting for the subdomain:

m.domain.app > IP2 > port 80 > lets encrypt > online.

I didn’t understand the other post different domain name explanation on how to declare and external IP.
Could you give me an example please?

2

solved it by adding: e DNS_SERVER=10.0.0.162 

version: '2'
services:
  cloudflare-ddns:
    image: oznu/cloudflare-ddns:latest
    restart: always
    environment:
      - API_KEY=my token
      - ZONE=domain.app
      - SUBDOMAIN=m
      - e DNS_SERVER=10.0.0.162
      - PROXIED=true
      - e CRON=*/5 * * * *
3

How did it help?
Are you aware that the description on Docker Hub contains instructions to use with the docker command and not inside a compose yaml file? Yes, it has a compose example file too, but you need to follow the syntax of Docker compose. The parameter list (required and optional) just shows you how you can use them with the docker command. In the compose yaml, you should not use that “e” before the variable name. I am surprised that was not a syntax error and compose let you run the container.

On the other hand, the creator of that image should not have been so confusing in the description either. That parameter list looks weird to me there.