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Imagine you want to reset your Docker swarm from time to time.

How do you distribute join tokens to those zillions of nodes? How much automation is possible here?

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2 Answers 2

Reset to default
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Have the Swarm Manager place the worker join token in a Key/Value store. We use AWS Parameter Store but I believe Consul would be another option (I don't use it).

Each node can then retrieve the token while it is bootstrapping.

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  • what if you have more than 1 manager?
    – Ta Mu
    Jan 26, 2018 at 7:21
  • The manager join token can be stored in a K/V store as well. The initial manager token is the starting point for rebuilding or bootstrapping the Swarm.
    – swysocki
    Jan 26, 2018 at 13:05
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Simple answer with infrastructure as code, you don't rejoin nodes, you trash old nodes and bring fresh nodes to join the cluster.

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  • still you need to tell the new nodes as well how they join as worker either manager. Or do you mean once a token is there you bake it into their IaC?
    – Ta Mu
    Jan 26, 2018 at 7:22
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    I just mean same principle as building a new cluster, code your cluster building process and then when you want to reset, build a new and trash the old one. How you code this is fairly personal ...
    – Tensibai
    Jan 26, 2018 at 8:36

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