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Docker Swarm: how to update published post – Nginx

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

enter image description here

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

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2

Answers


  1. 0

    Remove those services and start it like this instead:

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

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  2. 0

    The --publish-rm option takes the target port, not the published port:

    docker service update --publish-rm 80 --publish-add 8081:80 nginx-app
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