Docker 1.12.3 updates the new Swarm Mode feature introduced in the Docker 1.12 series by improving the conversion of restart-policy and adding an up-to-date Swarmkit that now allows multiple randomly assigned and duplicate published ports with different protocols. Moreover, it looks like a task that has already been restarted will no longer be restarted thanks to the updated Swarmkit included in Docker 1.12.3, which also addresses the panic that occurred when allocations happened at init time. Several fixes were applied to the libnetwork component in Docker 1.12.3 for better networking.