Machine constraints in Docker swarm

Open Source Projects Swarm
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1

Hello everyone:

I wanted to know if there is a way to specify constraints for Dockers launched with Swarm. The idea is to use Swarm to start Docker containers across the cluster following a certain workflow

e.g. first start container C1 on Machine A. After that containers C2, C3 and C4 on machines B, C and D. Finally start some container C5 on machine E.

All this Docker containers will have to communicate between each other. Is that possible with Swarm?

2

Yes you can achieve this by placing constraints on the nodes and for communication use overlay network.

For deploying containers on particular node machine in swarm.
docker node update --label-add ‘ip=xxx’ <node_id>
docker network create -d overlay swarm_net

docker service create --constraint ‘node.labels.ip==xxx’ --name --network swarm_net