Increase Docker API version to work with Windows Containers

[StefanScherer]

What version of Traefik are you using (traefik version)?

Version:      v1.1.2
Codename:     camembert
Go version:   go1.7.4
Built:        2016-12-15_10:27:40AM
OS/Arch:      windows/amd64

What is your environment & configuration (arguments, toml...)?

• Dockerfile:

FROM microsoft/nanoserver

ADD https://github.com/containous/traefik/releases/download/v1.1.2/traefik_windows-amd64 /traefik.exe

VOLUME C:/etc/traefik
VOLUME C:/etc/ssl
RUN powershell -command \
    set-itemproperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices' -Name 'T:' -Value '\??\C:\etc\traefik' -Type String ; \
    set-itemproperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices' -Name 'S:' -Value '\??\C:\etc\ssl' -Type String

EXPOSE 80
ENTRYPOINT ["/traefik", "--configfile=T:/traefik.toml"]

# Metadata
LABEL org.label-schema.vendor="Containous" \
      org.label-schema.url="https://traefik.io" \
      org.label-schema.name="Traefik" \
      org.label-schema.description="A modern reverse-proxy" \
      org.label-schema.version="v1.1.2" \
      org.label-schema.docker.schema-version="1.0"

• traefik.toml:

################################################################
# Web configuration backend
################################################################
[web]
address = ":8080"
################################################################
# Docker configuration backend
################################################################
[docker]
domain = "docker.local"
watch = true
# Use Swarm Mode services as data provider
#
# Optional
# Default: false
#
#swarmmode = true

################################################################
# Enable docker TLS connection
# use -v path-on-host-to-tls-certs:C:\etc\ssl and the certs
# will appear in drive S:
################################################################
[docker.tls]
ca = "S:/ca.pem"
cert = "S:/cert.pem"
key = "S:/key.pem"

What did you do?

Run Traefik inside a Windows Nanoserver container to communicate with a Windows Docker engine

docker build -t traefik .
docker run -it -v C:$(pwd):C:/etc/traefik -v C:/Users/vagrant/.docker:C:/etc/ssl -p 8080:8080 -p 80:80 traefik --docker.endpoint=tcp://172.31.80.1:2376 --loglevel=DEBUG

What did you expect to see?

Traefik should connect to the Windows Docker engine 1.13.0 which forces minimum API version 1.24.

time="2017-02-01T13:45:04-08:00" level=debug msg="Docker connection established with docker 1.13.1-rc1 (API 1.25)" 

What did you see instead?

time="2017-02-01T13:44:31-08:00" level=error msg="Failed to list containers for docker, error Error response from daemon: client version 1.21 is too old. Minimum supported API version is 1.24, please upgrade your client to a newer version" 

I did a proof of concept which works by patching provider/docker.go to use API version 1.24. Should I send this change as PR? I don't know if that would be fine on Linux as Traefik would no longer work with older Docker engines.

You can find my test setup for Windows at https://github.com/StefanScherer/dockerfiles-windows/tree/master/traefik

[StefanScherer]

Another issue regarding running Traefik in Windows containers is that #1009 does not work on Windows. There is no "600" file permission, so I had to comment out that while testing with master branch.

[emilevauge]

@StefanScherer thanks for giving some feedback.
@vdemeester is there any issue to go with Docker API v1.24 (compatibility with Docker 1.10) ?

[vdemeester]

@emilevauge @StefanScherer I'm ok dropping support for 1.9 and lower ; but we could also have a api version number different depending on the architecture, @containous/traefik wdyt ?

[prochnowc]

@emilevauge This is also an issue when running traefik for linux on docker for windows (with experimental LCOW support).