I have a swarm running with one manager and multiple workers.
I want a specific service to be deployed once (and only once) per node, but only on the workers. The manager still run other services.
What I found doesn't fit my needs:
mode: global do what I want for the 'once per container' but that does not exclude the manager.mode: replicated
replicas: 6
placement:
constraints:
- node.role == worker limit to the worker but with that solution there could be more than one replicas on a node. And --max-replicas-per-node doesn't exist yet.
docker node update --availability drain manager1 removes the manager from the workers, but that's not possible either because my manager should run other services.
You can combine your first solution with the second one. Something like this works well for me in my environment:
mode: global
placement:
constraints:
- node.role == worker
The only issue would be that you need to assign a label (worker) to every node you need to run the service on.