In docker swarm mode you can list nodes with docker node ls. If you want to assign a label to each node you can use the below command to update node labels. For example you can assign a key=value pair like role=storage to one of your node listed with the first command:

docker node update --label-add role=storage YOUR_HOSTNAME

Read more here:
- https://docs.docker.com/engine/swarm/manage-nodes/#update-a-node

The great thing about this labeling is in docker compose file that you can tell docker which server should get deployed on which server (node):

deploy:
   replicas: 4
   placement:
     constraints:
       - node.labels.role == storage

NOTE: role is something that we ourselves have been defined. You can define your own as requirements vary.


#docker #node #swarm #label #role