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In the two days, the Docker Swarm Mode will be added to the new management node to report the following errors (as seen in the /var/log/messages file):

Handler for POST /v1.37/swarm/join returned error: manager stopped: can’t initialize raft node: rpc error: code = Unavailable desc = grpc: the connection is unavailable

Search keywords in stackoverflow,A survey found a post:


It means not to use an agent.


The NO_PROXY in the swarm set up the IP node of manager node. The problem is finally solved.

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