Apk index fails fetching on armv7 (Raspberry)

[FrancisHGR]

• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

After pulling latest version (3.13.1), apk update / upgrade / add should work.

Actual behavior

However all commands starting with apk are throwing errors (see below).

/ # apk update
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/main/armv7/APKINDEX.tar.gz
ERROR: https://dl-cdn.alpinelinux.org/alpine/v3.13/main: temporary error (try again later)
WARNING: Ignoring https://dl-cdn.alpinelinux.org/alpine/v3.13/main: No such file or directory
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/community/armv7/APKINDEX.tar.gz
ERROR: https://dl-cdn.alpinelinux.org/alpine/v3.13/community: temporary error (try again later)
WARNING: Ignoring https://dl-cdn.alpinelinux.org/alpine/v3.13/community: No such file or directory
2 errors; 14 distinct packages available

Steps to reproduce the behavior

docker run -it --rm --name test alpine:3.13.1 sh
apk update

Please note: running 3.12.3 works without a problem on the same machine, same network etc.

docker run -it -rm --name test alpine:3.12.3 sh
/ # apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/armv7/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/armv7/APKINDEX.tar.gz
v3.12.3-83-g9e25995019 [http://dl-cdn.alpinelinux.org/alpine/v3.12/main]
v3.12.3-77-g89584230ef [http://dl-cdn.alpinelinux.org/alpine/v3.12/community]
OK: 12345 distinct packages available
/ # exit

Output of docker version:

Client: Docker Engine - Community
Version: 20.10.2
API version: 1.41
Go version: go1.13.15
Git commit: 2291f61
Built: Mon Dec 28 16:18:13 2020
OS/Arch: linux/arm
Context: default
Experimental: true

Server: Docker Engine - Community
Engine:
Version: 20.10.2
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: 8891c58
Built: Mon Dec 28 16:15:48 2020
OS/Arch: linux/arm
Experimental: false
containerd:
Version: 1.4.3
GitCommit: XXXX
runc:
Version: 1.0.0-rc92
GitCommit: XXXX
docker-init:
Version: 0.19.0
GitCommit: de40ad0

Output of docker info:

Client:
Context: default
Debug Mode: false
Plugins:
app: Docker App (Docker Inc., v0.9.1-beta3)
buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)

Server:
Containers: 19
Running: 2
Paused: 0
Stopped: 17
Images: 57
Server Version: 20.10.2
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Cgroup Version: 1
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 269548fa27e0089a8b8278fc4fc781d7f65a939b
runc version: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
init version: de40ad0
Security Options:
seccomp
Profile: default
Kernel Version: 5.4.83-v7+
Operating System: Raspbian GNU/Linux 10 (buster)
OSType: linux
Architecture: armv7l
CPUs: 4
Total Memory: 924.8MiB
Name: raspberrypi
ID: XXXX
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

WARNING: No memory limit support
WARNING: No swap limit support
WARNING: No kernel memory TCP limit support
WARNING: No oom kill disable support
WARNING: No blkio weight support
WARNING: No blkio weight_device support
WARNING: No blkio throttle.read_bps_device support
WARNING: No blkio throttle.write_bps_device support
WARNING: No blkio throttle.read_iops_device support
WARNING: No blkio throttle.write_iops_device support

Additional environment details (AWS, VirtualBox, physical, etc.)

[tianon]

This looks like a duplicate of #135 👀

[FrancisHGR]

Thank you for guiding me to this thread, I googled everywhere to find a fix for this problem until I came up with my own analysis. Would have saved me lots of time...