GCP 上的 docker 图像（nodejs 应用程序）返回 ERR_CONNECTION_REFUSHED（在本地工作）

Question

I have create a docker image from a nodejs app. I want to start a VM instance with the docker image on GCP Compute Egine Instance.

When I test the image locally and I navigate with my browser to http://localhost:8000 , it works. So I don't think there is something wrong with my docker image.

docker run -p 8000:8000 -d <username>/<docker-file>

I have pushed the docker image to google container repository with the following commands:

docker tag <username>/<docker-file> gcr.io/<project-id>/<docker-file>
docker push gcr.io/<project-id>/<docker-file>

Now, when I add the URL (gcr.io/project-id/docker-file) to a VM instance, and I wait untill the instance is running, I get an error when I navigate to http://[instance_external_ip]:8000 , I get the error ERR_CONNECTION_REFUSED.

I have set a firewall rule to allow ingress traffic on port tcp = 8000 and IP range 0.0.0.0/0.

Am I missing something?

Edit:

My dockerfile

FROM node:10

WORKDIR /usr/src/nodejs

COPY package*.json ./

RUN npm install

COPY . .

EXPOSE 8080

CMD [ "node", "index.js" ]

Answer 1

In your Dockerfile you expose 8080 not 8000.

Did you check that your container is running on the instance? tried to curl/telnet it too?

Answer 2

How/when do you start running the docker? Could you run this command

docker run -p 8000:8000 -d gcr.io/<project-id>/<docker-file>:latest

And then try to confirm that it's running locally first using

curl localhost:8000