Docker stack deploy: unable to set dnsrr as ports are exposed as ingress

Question

When launching services using stack deploy we get the following error:

"Error response from daemon: rpc error: code = 3 desc = EndpointSpec: port published with ingress mode can't be used with dnsrr mode"

Testing has led me to try: manually creating a network with ignress=false set, launching the stack deploy without exposing ports and joining the nodes to the network, then manually exposing ports.

docker service update --publish-add 5672:5672 service_name1

but still get the same error.

any thoughts?

Answer 1

For services with endpoint-mode set to dnsrr ports can't be published with the default mode which is 'ingress'. Changing the publish mode to host should work.

docker service update --publish-add published=80,target=80,protocol=tcp,mode=host service_name

In compose file it would be like,

ports:
  - target: 80
    published: 80
    protocol: tcp
    mode: host

Answer 2

Exposing the port can be achieved by following these 2 commands:-

docker service update service_name1 --endpoint-mode=vip
docker service update --publish-add 5672:5672 service_name1

This will change endpoint mode to vip from dnsrr and later you can expose port with the same command