Docker Swarm: how to update published post

Question

I use the Play-with-Docker platform to create a Swarm cluster with 3 Docker instances: 1 manager and 2 workers; then I create a service from the image nginx:alpine:

docker service create -p 8080:80 --name nginx-app nginx:alpine

Things worked fine.

Then I update the service to change the published port: instead of 8080, now I want the published port to be 8081. I ran this:

docker service update --publish-rm 8080 --publish-add 8081 nginx-app

But it did not remove the published port 8080; instead it created another published port 30002, this port 30002 mapped to 8081

What did I do wrong here? How can I change the published port?

question from:https://stackoverflow.com/questions/65929883/docker-swarm-how-to-update-published-post

Answer 1

Remove those services and start it like this instead:

docker service create -p 8081:80 --name nginx-app nginx:alpine