`dfx ping` fails for version `0.28.0` running inside docker

[michaldroncl]

There is an issue with connectivity when trying to connect to dfx running in docker container. When running on external server I have no issue. Running from dfx ping from docker, host, external server doesn't help (tested with installed dfx 0.26.1 and 0.28.0 on client).

I tried the following:

1. Run dfx inside docker (0.26.1, 0.27.0, 0.28.0)

ENV DFX_VERSION=0.28.0
RUN DFXVM_INIT_YES=true sh -ci "$(curl -fsSL https://internetcomputer.org/install.sh)"
ENV PATH="$HOME/.local/share/dfx/bin:$PATH"
RUN dfxvm install ${DFX_VERSION}
ENTRYPOINT ["sh", "-c", "dfx start --host 0.0.0.0:4943"]

There are also nvm and python pocket installation scripts like in icp-dev-env container. I use also version with script and SIGTERM to gracefully stop dfx on docker stop, but both options fail only for 0.28.0

2. Ping outside docker using:

dfx ping 172.17.0.1:4943

Ping inside container, which runs dfx works ok. Ping to localhost:4943, 127.0.0.1:4943 works.

I expected to see this happen:

{
  "replica_health_status": "healthy",
  "root_key": [...]
}

Instead, this happened:

Error: Failed while waiting for agent status.
Caused by: The replica returned an HTTP Error: Http Error: status 400 Bad Request, content type "text/plain; charset=utf-8", content: error: unknown_domain
details:
The requested domain is not served by this HTTP gateway.

Specifying --domain 172.17.0.1 on dfx start works for version 0.28.0, but doesn't work when container is on another server e.g. 192.168.0.12 and sends dfx ping http://192.168.0.12:4943.

Meta

dfx --version:

0.26.1 -> ok
0.27.0 -> ok
0.28.0 -> not ok

Further log output

Container:

Using the default configuration for the local shared network.
No local network replica found. Nothing to do.
info: dfx 0.28.0 is already installed
Running dfx start for version 0.28.0
Using the default configuration for the local shared network.
Replica API running on 0.0.0.0:4943. You must open a new terminal to continue developing. If you'd prefer to stop, quit with 'Ctrl-C'.

Client:

Error: Failed while waiting for agent status.
Caused by: The replica returned an HTTP Error: Http Error: status 400 Bad Request, content type "text/plain; charset=utf-8", content: error: unknown_domain
details:
The requested domain is not served by this HTTP gateway.