Error response from daemon: This node is already part of a swarm.

I am new to the academy.  As per my understanding, for adding nodes to swarm, we need to run it on different machines. i.e. new CentOS server (out of 6 servers provided) else it would give error as mentioned above. Do we need to install docker on all the servers to be used by following the first lecture of the installation session? How many servers we need to keep ready for this course?
Thanks in advance 
  • post-author-pic
    Keith T


    You will need to install docker on all of the nodes in your swarm and the installation of Docker will be the same for all. For the most part this course will use 3 servers, but at a point it will add in a fourth (when covering how to back up and restore a Docker Swarm manager).

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