Add dockerfile-arm32v6 template

[pcorbel]

Add a dockerfile arm32v6 template based on the existing dockerfile template

Expected Behaviour

ARM users should be able to use an official dockerfile template

Current Behaviour

OpenFaaS don't offer as of now the possibility to run dockerfile functions from an official template on a ARM cluster (like Raspberry pi).

Possible Solution

Add an official template based on arm32v6/alpine instead of alpine
armhf has been deprecated in favor of arm32v6.
Moreover, arm32v6 is compatible with arm32v6, arm32v7 and arm64v8 cpus.

Steps to Reproduce (for bugs)

On an ARM based server,

1. faas new helloworld --lang dockerfile
2. faas build --yaml helloworld.yml

Container fail to start
docker logs <helloworld container>
returns
standard_init_linux.go:190: exec user process caused "exec format error"

Context

I was trying to setup an Hello World (dockerfile based) on my Raspberry Pi

Your Environment

• Docker version docker version (e.g. Docker 17.0.05 ):

Client:
 Version:           18.09.0
 API version:       1.39
 Go version:        go1.10.4
 Git commit:        4d60db4
 Built:             Wed Nov  7 00:57:21 2018
 OS/Arch:           linux/arm
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.0
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       4d60db4
  Built:            Wed Nov  7 00:17:57 2018
  OS/Arch:          linux/arm
  Experimental:     false

• Are you using Docker Swarm or Kubernetes (FaaS-netes)? Docker Swarm

• Operating System and version (e.g. Linux, Windows, MacOS): Linux

• Link to your project or a code example to reproduce issue:

[alexellis]

Hi @pcorbel,

Thanks for your interest in the project.

armv6 support was removed from OpenFaaS due to lack of demand, compatibility with Kubernetes and limited horse-power to do everything with a very small team of community volunteers.

openfaas/faas#501

If you can use a dockerfile-armhf template then please propose one using the official multi-arch image of alpine:3.9.

Alex

[pcorbel]

Hi @alexellis,

Understood for the armv6 support.

I can indeed use a dockerfile-armhf template from either the alpine:3.8 or alpine:3.8 official multi-arch image (thanks you fat manifest...)

The only difference with the current dockerfile template would be the watchdog binary.

Is it okay for you if I open a new issue with the above information or is there still something I'm missing?