Raspberry Pi Cluster – this guide will show you how to run a using Docker Swarm

Edit „/etc/hosts“ for each cluster member

192.168.1.100   rpi-iot-jsho-DockerCluster-00
192.168.1.101   rpi-iot-jsho-DockerCluster-01
192.168.1.102   rpi-iot-jsho-DockerCluster-02

Edit „/etc/ssh/sshd_config“ and update the field „PermitRootLogin“ for each cluster member

# vi /etc/ssh/sshd_config
PermitRootLogin yes

# /etc/init.d/ssh restart

root@rpi-iot-jsho-dockerCluster-00:~# ssh-keygen -t rsa

root@rpi-iot-jsho-DockerCluster-00:~# ssh-copy-id ssh-copy-id root@rpi-iot-jsho-DockerCluster-01
root@rpi-iot-jsho-DockerCluster-00:~# ssh-copy-id ssh-copy-id root@rpi-iot-jsho-DockerCluster-02

Install Docker on each node

root@rpi-iot-jsho-DockerCluster-00:~# curl -sSL https://get.docker.com | sh
root@rpi-iot-jsho-DockerCluster-01:~# curl -sSL https://get.docker.com | sh
root@rpi-iot-jsho-DockerCluster-02:~# curl -sSL https://get.docker.com | sh

Create the swarm

 root@rpi-iot-jsho-DockerCluster-00:~# docker swarm init –advertise-addr 192.168.1.100

Add the rest of the nodes to the swarm

root@rpi-iot-jsho-DockerCluster-00:~# docker swarm join-token manager

root@rpi-iot-jsho-DockerCluster-00:~# docker swarm join-token worker

root@rpi-iot-jsho-DockerCluster-01:~# docker swarm join –token SWMTKN-1-2r32j380gm7cej0cw9p4d6nk65qik2p3stc1t65rb3eigapwms-507hts883sm0i7raj4bdr7r5k 192.168.1.100:2377
root@rpi-iot-jsho-DockerCluster-02:~# docker swarm join –token SWMTKN-1-2r32j380gm7cej0cw9p4d6nk65qik2p3stc1t65rb3eigapwms-507hts883sm0i7raj4bdr7r5k 192.168.1.100:2377

root@rpi-iot-jsho-DockerCluster-00:~# docker node ls
ID                            HOSTNAME                        STATUS              AVAILABILITY        MANAGER STATUS
kpo4hpblpqyswzzyiq6lfhuef *   rpi-iot-jsho-DockerCluster-00   Ready               Active              Leader
nuy11jbsa5is971zpsbsje32v     rpi-iot-jsho-DockerCluster-01   Ready               Active
n1lxz89yddjk02y0bf1nebnkb     rpi-iot-jsho-DockerCluster-02   Ready               Active

Leave the swarm

# docker swarm leave –force

Run our first service

root@rpi-iot-jsho-DockerCluster-00:~# docker service create \
        –name viz \
        –publish 8080:8080/tcp \
        –constraint node.role==manager \
        –mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
        alexellis2/visualizer-arm:latest

root@rpi-iot-jsho-DockerCluster-00:~# docker service ls
lqejzqrv0le8  viz   replicated  0/1       alexellis2/visualizer-arm:latest

It will say 1/1 when it’s ready

Once it’s ready you can visit http://192.168.1.100:8080 (the IP@ of rpi-iot-jsho-DockerCluster-00 and port 8080 )