We need to build and test Docker for the new Raspbian Stretch OS for Raspberry Pi:

Stretch:

https://www.raspberrypi.org/downloads/raspbian/

Docker CE packaging repo:

https://github.com/docker/docker-ce-packaging

Git clone, and make deb

The last official Docker binaries for Raspberry Pi (Raspbian) were released in May at version 17.05. 17.05 is fully working including Docker Swarm and is available via curl -sSL get.docker.com | sh.

Support was going to be dropped for Raspbian (and ARMv6) from 17.05 onwards, but fortunately the decision was re-considered.

We need to test Docker 17.07 RC on Raspbian Jessie and Stretch on the ARMv6 (Pi Zero/B/B+) and ARMv7 (RPi 2/3) platforms. Unfortunately this may mean building from source which can take some time and can be tricky on a small device.

Please setup an environment with instructions in #16

Then pick one or all of the following issues:

• #15
• #14
• #13

Is it possible to make the RPi Zeros access the RPi 3 network an get an IP address on that network. Assuming all my RPi Zeros are using the OTG network and connected to RPi 3 via USB.

I think I can use something link bridge but didn't tested it yet.

I just mounter my first setup (1 RPi 3 + 4 RPi Zero ), but I'm planning to make other similar setups.

If the RPi Zero is only acessible inside the RPi 3 network, it woldn't be possible to manage all theses RPi Zero workers in a swarm composed of two or more of these kits.

Did you get the point ?

I'll do some tests soon, when I get the module for ethernet and serial to work simultaneously so I can still access the RPi Zeros even if I lose network access. ;)

Issue:

Docker Swarm is broken in Docker CE 17.07

You cannot schedule ARM containers.

Work needed:

We need to rebuild Docker with the follow PR added to see if it resolves the issue.

moby/moby#34021

• Git clone moby
• Checkout Moby with the correct 17.07 tag and then run make in the moby directory.
• You might want to add a swap file for building too

Update: We've tested the issue on ARMv7 but have to repeat for ARMv6 on a Pi Zero. Bootstrap here - #19

To install Docker on ARMv6/PiZero you must follow the tune-up guide #16. Add 1-2GB of swap memory.

Option A: Jessie
Flash Jessie Lite then run:

$ curl -sSL get.docker.com | sh

Option B: Stretch
If you're on stretch then things are more complicated.

Try editing this file and inserting "jessie" instead: /etc/apt/sources.list.d/docker.list

Now you can clone docker/docker and start testing one of the issues listed in this repo under the label: community-supports-docker.

Check your Docker version:

pi@stretch-zero-1:~ $ cat /etc/os-release 
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
pi@stretch-zero-1:~ $ sudo docker version
Client:
 Version:      17.05.0-ce
 API version:  1.29u
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:30:54 2017
 OS/Arch:      linux/arm

Server:
 Version:      17.05.0-ce
 API version:  1.29 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:30:54 2017
 OS/Arch:      linux/arm
 Experimental: false
pi@stretch-zero-1:~ $ uname -a
Linux stretch-zero-1 4.9.41+ #1023 Tue Aug 8 15:47:12 BST 2017 armv6l GNU/Linux
pi@stretch-zero-1:~ $ 

Before building you will need to apply this patch to the Dockerfile.armhf file:

diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 6103c5a3a..4a64ca10c 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -15,7 +15,8 @@
 # the case. Therefore, you don't have to disable it anymore.
 #

-FROM armhf/debian:jessie
+#FROM armhf/debian:jessie
+FROM resin/rpi-raspbian:jessie

 # allow replacing httpredir or deb mirror
 ARG APT_MIRROR=deb.debian.org
@@ -78,7 +79,7 @@ ENV GOPATH /go

 # We're building for armhf, which is ARMv7, so let's be explicit about that
 ENV GOARCH arm
-ENV GOARM 7
+ENV GOARM 6

 # Dependency for golint
 ENV GO_TOOLS_COMMIT 823804e1ae08dbb14eb807afc7db9993bc9e3cc3

We need to run these tests with the following configuration:

Docker CE 17.07 on Raspbian Jessie

You can get it here - https://downloads.raspberrypi.org/raspbian_lite/images/raspbian_lite-2017-07-05/

Docker CE 17.07 on Stretch

You can get it here - https://downloads.raspberrypi.org/raspbian_lite/images/raspbian_lite-2017-08-17/

https://github.com/alexellis/swarmmode-tests/tree/master/arm

Swarm quick check list:

https://gist.github.com/alexellis/8e15f2ea1af7281268ec7274686985ba

• Add gpu_mem=16 to /boot/config.txt

• Create swap - increasing "RAM" by 1GB

$ sudo fallocate -l 1g /swap && \
  sudo mkswap /swap && \
  sudo chmod 0600 /swap

Run this command on each boot, or add to /etc/fstab

$ sudo swapon /swap

Install screen or tmux:

$ sudo apt update && sudo apt install -qy tmux

• Edit your hostname via raspi-config

• Run the kernel check:

$ sudo modprobe configs && \
    gunzip -c /proc/config.gz > ~/kernel.config && \
   curl -sSL https://raw.githubusercontent.com/docker/docker/master/contrib/check-config.sh | bash

• Optional: upgrade kernel via rpi-update

rpi-update is a package available via apt:

sudo apt update && sudo apt install -qy rpi-update
sudo rpi-update

The software for RPi Zero needs the armv6 architecture and only works with Raspbian (not the Debian instructions)

RPi2 and 3 use armv7 architecture and will work with packages for Debian or Ubuntu.

For RPi Zero Docker bootstrap - start here - #19

💯

Is that possible to have a single page instruction as on how to do everything on a Zero?

fyi nodsource now supports arm so this works very nicely now as opposed to getting the tarball.
This might be perferable. Nodesource is well established so it's a "safe" alternative to grabbing the tarball directly and will look for arm 6,7,8 and load appropriately.

curl -sL https://deb.nodesource.com/setup_7.x | bash -
apt-get install -y nodejs