[BUG] service name "changedetection.io" in readme docker compose example causes errors

[nopoz]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

The readme uses changedetection.io as the service name in the docker compose example. This causes a DNS resolution problem with the container's built-in example check for https://changedetection.io/CHANGELOG.txt. The container will resolve the hostname changedetection.io to the IP of the container rather than the desired external IP:

Using the current docker compose example:

---
services:
  changedetection.io:
    image: lscr.io/linuxserver/changedetection.io:latest
    container_name: changedetection
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - BASE_URL= #optional
      - PLAYWRIGHT_DRIVER_URL= #optional
    volumes:
      - /path/to/changedetection/config:/config
    ports:
      - 5000:5000
    restart: unless-stopped

Checking the name resolution with ping inside the container you get the incorrect IP of the container itself:

# docker exec -t -i changedetection /bin/bash
root@changedetection:/# ping changedetection.io
PING changedetection.io (172.20.0.3): 56 data bytes
64 bytes from 172.20.0.3: seq=0 ttl=64 time=0.042 ms
64 bytes from 172.20.0.3: seq=1 ttl=64 time=0.041 ms
64 bytes from 172.20.0.3: seq=2 ttl=64 time=0.039 ms

This could lead user to think there is something wrong within the container or it's settings, when it's just a docker DNS problem.

This can be fixed by changing the default docker compose service name from changedetection.io to changedetection:

---
services:
  changedetection:
    image: lscr.io/linuxserver/changedetection.io:latest
    container_name: changedetection
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - BASE_URL= #optional
      - PLAYWRIGHT_DRIVER_URL= #optional
    volumes:
      - /path/to/changedetection/config:/config
    ports:
      - 5000:5000
    restart: unless-stopped

After modification and checking name resolution in the container you get the correct external IP:

# docker exec -t -i changedetection /bin/bash
root@c89c27bb21f8:/# ping changedetection.io
PING changedetection.io (67.223.101.61): 56 data bytes
64 bytes from 67.223.101.61: seq=0 ttl=55 time=57.553 ms
64 bytes from 67.223.101.61: seq=1 ttl=55 time=57.497 ms

Expected Behavior

No response

Steps To Reproduce

see description

Environment

- OS:
- How docker service was installed:

CPU architecture

x86-64

Docker creation

see description

Container logs

see description

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