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Why are UCP 2.1.0 nodes continuously reconfiguring?

After upgrading to UCP 2.1.0, nodes in the UCP console repeatedly show:

Node being reconfigured.

Symptoms

  • On the hosts, the ucp-agent container is continuously restarting.
  • docker ps may take a long time to complete.

Solution

This issue was tracked by internal engineering issue orca/5917.  A fix was released with UCP 2.1.1.

For environments running UCP 2.1.0, this behavior can be addressed by issuing the following command from a manager node to update the service definition of the ucp-agent:

docker service update --mount-add type=bind,source=/etc/docker,target=/etc/docker ucp-agent