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I am trying to create a swarm cluster of Raspberry Pi(s). I have installed docker and docker machine in the Raspberry Pi. I intend to make one of the Raspberry Pis to be the Manager node.

When I am executing the command:

 docker swarm init --advertise-addr 192.168.1.148

It is giving me an error:

docker: 'swarm' is not a docker command.

Am I missing any basic configuration or I haven't installed any necessary package?

I have followed all the instructions from: Docker Documents

Thanks in advance.

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When you installed docker did you just install the one from the Repos (on raspbian)? The output of docker version would be helpful.

I seem to remember there is old (1.3 or thereabouts) version of docker in the Repos for raspbian which predates swarm.

If you setup docker via the foundations guide it adds newer repos to apt in order to get the latest versions.

You'd then install docker as docker-engine to get a version with swarm.

  • Thanks.. But after I have executed: curl -sSL https://get.docker.com | sh, it is showing me: W: Failed to fetch https://apt.dockerproject.org/repo/dists/raspbian-jessie/main/binary-armhf/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none – Soumyajit Chatterjee Mar 14 '17 at 15:37
  • You might need to sudo apt-get remove docker docker-engine to remove your old version then sudo apt-get install ca-certificates apt-transport-https before running that script. Those are the steps from the debian instructions docs.docker.com/engine/installation/linux/debian/… on the Docker website. – tobyd Mar 14 '17 at 16:13
  • Thanks.. Actually the concern was regarding the "date" in my RPi.. But surely thanks for your help.. – Soumyajit Chatterjee Mar 23 '17 at 18:01
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On a Raspberry Pi 3 model B running Raspbian Jessie if you follow these steps to install Docker swarm it will work!

# update and reboot
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo shutdown –r now

# Install Docker
$ curl –sSL https://get.docker.com | sh

# Add pi user to docker group
$ sudo usermod –aG docker pi

# restart to apply usermod changes
$ sudo shutdown –r now

# As pi user, check that Docker is working with the
$ Docker info

# Create swarm 
$ docker swarm init --advertise-addr 192.168.1.148

My thought is that maybe you have not added your pi user to the docker group.

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