Building a Docker Swarm cluster on ARM by Dieter Reuter and Stefan Scherer

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In this training you'll learn how to build a physical Docker Swarm cluster with Raspberry Pi's. We'll guide you through the setup process and you’ll learn how to use Docker and Docker Swarm to complete the cluster. You'll learn how to build and deploy a distributed application and ship it as Docker containers to your cluster. In the end you have built a portable datacenter which can be used for testing and live demos as well. - building a hardware cluster with Raspberry Pi’s - install and set up HypriotOS, a Debian-based Linux system - installing Docker and Docker Swarm to connect all cluster nodes - build a distributed application, the Docker voting app - ship the app with Docker Compose to your cluster - let’s run and test your app In this training you'll learn how to build a physical Docker Swarm cluster with Raspberry Pi's. We'll guide you through the setup process and you’ll learn how to use Docker and Docker Swarm to complete the cluster. You'll learn how to build and deploy a distributed application and ship it as Docker containers to your cluster. In the end you have built a portable datacenter which can be used for testing and live demos as well. - building a hardware cluster with Raspberry Pi’s - install and set up HypriotOS, a Debian-based Linux system - installing Docker and Docker Swarm to connect all cluster nodes - build a distributed application, the Docker voting app - ship the app with Docker Compose to your cluster - let’s run and test your app

Technology

Dieter Reuter @quintus23m
Senior Consultant, SEAL Systems
Stefan Scherer @stefscherer
Software Engineer, SEAL Systems
Building a Docker Swarm on ARM

Hardware
Pi’s
Switch
Power supply
Agenda
Software
SD card image
flash
docker-machine
Demo
docker-compose

• Education
• Learning cloud principles
• Hands-on cluster
Why?

Parts list
For a four node swarm.
• 4x Raspberry Pi 2/3
• 5 port switch with 5V
• 6x USB power supply
• Distant bolts 2.5mm
• 4x micro USB cable
• 1x 5.5mm barrel USB
• 4x flat patch cable
• 4x Micro SD cards
Build Hardware

HypriotOS
Get started with Docker
in 5 minutes

For Linux and Mac
Small helper script to do all these in just
one command:
• Download the SD card image
• Uncompress it
• Set hostname for device
• Set WiFi
Flash HypriotOS

Flash HypriotOS
$ flash
--hostname swarm01
--ssid wifipsk
--password wifipwd
https://downloads.hypriot.com/hypriotos-rpi-v0.8.0.img.zip
# repeat for swarm02..swarm04

Add your SSH key
$ ssh-keygen -R swarm01.local 
$ ssh-copy-id pirate@swarm01.local
# repeat for swarm02..swarm04

… some plumbing code
$ export TOKEN=$(for i in $(seq 1 32); do echo -n $(echo
"obase=16; $(($RANDOM % 16))" | bc); done; echo)
$ function getip() { (traceroute $1 2>&1 | head -n 1 |
cut -d( -f 2 | cut -d) -f 1) }

Create Docker Swarm manager
$ docker-machine create -d generic
--engine-storage-driver=overlay --swarm --swarm-master
--swarm-image hypriot/rpi-swarm:latest
--swarm-discovery="token://$TOKEN"
--generic-ip-address=$(getip swarm01.local)
swarm01

Create Docker Swarm nodes
$ docker-machine create -d generic
--engine-storage-driver=overlay --swarm
--swarm-image hypriot/rpi-swarm:latest
--swarm-discovery="token://$TOKEN"
--generic-ip-address=$(getip swarm02.local)
swarm02
# repeat for swarm03..swarm04

Control your Docker Swarm
$ eval $(docker-machine env --swarm swarm01)
$ docker info

• Self made cluster
• Pico Cluster
• BitScope Blade
Your ideas?
Examples

• http://blog.hypriot.com
• http://picocluster.com
• http://bitscope.com/product/blade
Further Links

Thank you!
@quintus23m
@stefscherer
@HypriotTweets

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1. Dieter Reuter @quintus23m Senior Consultant, SEAL Systems Stefan Scherer @stefscherer Software Engineer, SEAL Systems Building a Docker Swarm on ARM

2. Hardware Pi’s Switch Power supply Agenda Software SD card image flash docker-machine Demo docker-compose

3. • Education • Learning cloud principles • Hands-on cluster Why?

4. Build Hardware

5. Parts list For a four node swarm. • 4x Raspberry Pi 2/3 • 5 port switch with 5V • 6x USB power supply • Distant bolts 2.5mm • 4x micro USB cable • 1x 5.5mm barrel USB • 4x flat patch cable • 4x Micro SD cards Build Hardware

7. HypriotOS Get started with Docker in 5 minutes

8. For Linux and Mac Small helper script to do all these in just one command: • Download the SD card image • Uncompress it • Set hostname for device • Set WiFi Flash HypriotOS

9. Flash HypriotOS $ flash --hostname swarm01 --ssid wifipsk --password wifipwd https://downloads.hypriot.com/hypriotos-rpi-v0.8.0.img.zip # repeat for swarm02..swarm04

10. Find your Pi $ ping swarm01.local

11. Add your SSH key $ ssh-keygen -R swarm01.local  $ ssh-copy-id pirate@swarm01.local # repeat for swarm02..swarm04

12. … some plumbing code $ export TOKEN=$(for i in $(seq 1 32); do echo -n $(echo "obase=16; $(($RANDOM % 16))" | bc); done; echo) $ function getip() { (traceroute $1 2>&1 | head -n 1 | cut -d( -f 2 | cut -d) -f 1) }

13. Create Docker Swarm manager $ docker-machine create -d generic --engine-storage-driver=overlay --swarm --swarm-master --swarm-image hypriot/rpi-swarm:latest --swarm-discovery="token://$TOKEN" --generic-ip-address=$(getip swarm01.local) swarm01

14. Create Docker Swarm nodes $ docker-machine create -d generic --engine-storage-driver=overlay --swarm --swarm-image hypriot/rpi-swarm:latest --swarm-discovery="token://$TOKEN" --generic-ip-address=$(getip swarm02.local) swarm02 # repeat for swarm03..swarm04

15. Control your Docker Swarm $ eval $(docker-machine env --swarm swarm01) $ docker info

16. Demo Time

17. • Self made cluster • Pico Cluster • BitScope Blade Your ideas? Examples

18. • http://blog.hypriot.com • http://picocluster.com • http://bitscope.com/product/blade Further Links

19. Thank you! @quintus23m @stefscherer @HypriotTweets

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