wget: bad address 'dotnetcli.azureedge.net' using Alpine dockerfile

[danmoseley]

I'm a docker beginner.

1. Using WSL2 Ubuntu 20.04, Docker version 20.10.1, build 831ebea
2. Downloaded https://github.com/dotnet/dotnet-docker/blob/fc0269dcc5f9b8fcbedf6ff8d83514eb9a75486e/src/runtime/5.0/alpine3.12/amd64/Dockerfile to DOCKERFILE

an@LAPTOP-P6UJDVTA:~/docker$ docker build - < DOCKERFILE
Sending build context to Docker daemon   2.56kB
Step 1/4 : ARG REPO=mcr.microsoft.com/dotnet/runtime-deps
Step 2/4 : FROM $REPO:5.0-alpine3.12-amd64
 ---> 600d71439e82
Step 3/4 : ENV DOTNET_VERSION=5.0.2
 ---> Using cache
 ---> 61c8f8cc5c38
Step 4/4 : RUN wget -O dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Runtime/$DOTNET_VERSION/dotnet-runtime-$DOTNET_VERSION-linux-musl-x64.tar.gz     && dotnet_sha512='84e69846188689cf5ee1eddce77c6cf92a7becddac9cdd9b985a490446d5acbd5d59e3703e8da4241895c1907b85bac852735c756098774e3b890c1944cda64f'     && echo "$dotnet_sha512  dotnet.tar.gz" | sha512sum -c -     && mkdir -p /usr/share/dotnet     && tar -C /usr/share/dotnet -oxzf dotnet.tar.gz     && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet     && rm dotnet.tar.gz
 ---> Running in 628f94511f83
wget: bad address 'dotnetcli.azureedge.net'
The command '/bin/sh -c wget -O dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Runtime/$DOTNET_VERSION/dotnet-runtime-$DOTNET_VERSION-linux-musl-x64.tar.gz     && dotnet_sha512='84e69846188689cf5ee1eddce77c6cf92a7becddac9cdd9b985a490446d5acbd5d59e3703e8da4241895c1907b85bac852735c756098774e3b890c1944cda64f'     && echo "$dotnet_sha512  dotnet.tar.gz" | sha512sum -c -     && mkdir -p /usr/share/dotnet     && tar -C /usr/share/dotnet -oxzf dotnet.tar.gz     && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet     && rm dotnet.tar.gz' returned a non-zero code: 1

Is it something to do with the version of wget or how it is configured? I tried an Alpine 3.11 WSL2 image (no docker involved) and the busybox wget also fails (albeit with a different message) but the standalone wget works:

C:\Users\danmose>wsl -d Alpine -u root
LAPTOP-P6UJDVTA:/mnt/c/Users/danmose# wget
BusyBox v1.31.1 () multi-call binary.
...
LAPTOP-P6UJDVTA:/mnt/c/Users/danmose# wget -O dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Runtime/5.0.2/dotnet-runtime-5.0.2-linux-musl-x64.tar.gz
Connecting to dotnetcli.azureedge.net (192.229.254.5:443)
wget: can't connect to remote host (192.229.254.5): Connection refused
LAPTOP-P6UJDVTA:/mnt/c/Users/danmose# apk add --update wget
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/3) Installing libunistring (0.9.10-r0)
(2/3) Installing libidn2 (2.3.0-r0)
(3/3) Installing wget (1.20.3-r1)
Executing busybox-1.31.1-r19.trigger
OK: 10 MiB in 19 packages
LAPTOP-P6UJDVTA:/mnt/c/Users/danmose# wget -O dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Runtime/5.0.2/dotnet-runtime-5.0.2-linux-musl-x64.tar.gz
--2021-01-17 01:37:10--  https://dotnetcli.azureedge.net/dotnet/Runtime/5.0.2/dotnet-runtime-5.0.2-linux-musl-x64.tar.gzResolving dotnetcli.azureedge.net (dotnetcli.azureedge.net)... 192.229.254.5, 192.229.254.6, 192.229.254.5, ...
Connecting to dotnetcli.azureedge.net (dotnetcli.azureedge.net)|192.229.254.5|:443... failed: Connection refused.
Connecting to dotnetcli.azureedge.net (dotnetcli.azureedge.net)|192.229.254.6|:443... failed: Connection refused.
Connecting to dotnetcli.azureedge.net (dotnetcli.azureedge.net)|192.229.254.5|:443... failed: Connection refused.
Connecting to dotnetcli.azureedge.net (dotnetcli.azureedge.net)|192.229.254.6|:443... failed: Connection refused.
Connecting to dotnetcli.azureedge.net (dotnetcli.azureedge.net)|72.21.81.200|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 30274404 (29M) [application/octet-stream]
Saving to: 'dotnet.tar.gz'

@MichaelSimons what am I doing wrong?

[MichaelSimons]

@danmosemsft, I'm not sure. I use this configuration regularly. The only difference is I am using docker 20.10.2. Curious if you are able to execute the wget command from your WSL2 Ubuntu 20.04 environment? Also have you tried building the Alpine Dockerfile from your Windows host? I would expect this to fail since your Docker environment is configured to use the WSL 2 based engine.

[danmoseley]

Yes it fails in a Windows prompt -- can't connect to docker daemon - I assume because as you say I've set it up for WSL2.