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I am using docker swarm with multiple notes and multiple instances of one docker image. As far as I know is there no influence about which container I interact with after a request. But how does the swarm leader/ manager decides to which container I am talking to? Is there any pattern or is it just random?

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The implementation is round-robin per connection by the node initially receiving the connection. Under the covers, there are some iptables entries that send requests to IPVS. Between the nodes, it's using VXLAN for overlay networking. And within a single node, connections are mapped with various iptables rules, bridge networks, and virtual ethernet interfaces.

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