This error means: no suitable node (host mode port has been used on 1 node)

In fact, it means that the port has already been used by a node, and there are other nodes that cannot be used if they want to use it.

Why is this so? Because I opened up port mapping in compose.yaml

Replicas: 2, but the port mapping is released 8080:8080, three nodes, but the server has only one 8080, the first one occupies 8080, the others will not be able to get up after that,

The solution is: just remove the port mapping. The production environment does not require others to access the service through the 8080, so there is no need to open the 8080 mapping.