如何将本地构建部署到虚拟机中的docker swarm？

Question

I am learning Docker and trying to follow the Docker tutorial and am in step 4 here .

Basically in this step, we are creating 2 VMs for docker swarm: 1 as swarm manager and 1 as swarm worker.

I think it pulls docker-hub pushed image to the virtual machines to get the service working in swarm. Problem is I am not pushing my built image to docker hub.

My question is, can I use local build to deploy to the swarm VM?

I tried to change image line the example docker-compose.yml to build like so:

version: "3"
services:
  web:
    # replace username/repo:tag with your name and image details
    # image: friendlyhello
    build: .
    deploy:
      replicas: 5
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
      restart_policy:
        condition: on-failure
    ports:
      - "4000:80"
    networks:
      - webnet
networks:
  webnet:

it of course does not work, which is why I am asking if there is a way to do this?

Answer 1

You can create a local registry on the vm or your local machine and push/pull images from local repo

docker run -d -p 5000:5000 --restart=always --name registry registry:2

Then name/tag your images using

localhost:5000/Image_Name:Tag

Then push images using

docker push localhost:5000/Image_Name:Tag

This will let you save your images in a local registry that your swarm can use without pushing to dockerhub