Docker container only runs dashboard app on localhost:4200 and when localhost:8080 it display the nginx webpage

Question

So I wrote this Dockerfile:

FROM node:13-alpine as build

WORKDIR /app

COPY package*.json /app/

RUN npm install -g ionic

RUN npm install

COPY ./ /app/

RUN npm run build

FROM nginx:alpine

RUN rm -rf /usr/share/nginx/html/*

COPY --from=build /app/dist/ /usr/share/nginx/html/

When it run the command npm run build it is going to create the Dist folder the second last line is going to remove the things from the folder nginx/html and than the last line is going to replace this folder with the files from the Dist folder, where is the Index.html .

when i run the code: docker build -t dashboard-app:v1. it creates the image

Than i run the code: docker run --name dashboard-app-container -d -p 8080:80 dashboard-app:v1

when i go to localhost:8080 it show " NGINX. If you see this page, the nginx web server is succesfully installed and working. Further coonfig. is required"

I dont know if my problem is that docker is not being able to replace the Dist folder and finding the index html or if is some port problem.

When i run it on localhost:4200 i can see the dashboard app.

Any sugestion???

Thank you in advance

Answer 1

It is certainly hard to know what is your Dist folder containing and what was copied over to the nginx/html/ location.

As long as you get a response on port 8080 , it means that nginx is running but is not able to find index.html page in the nginx/html/ folder.

What I suggest doing is to run your Docker image with the following command from a terminal. Notice, the -d is removed, you will be able to see the logs from the container:

docker run --name dashboard-app-container -p 8080:80 dashboard-app:v1

In another terminal connect to the image using the following command:

docker exec -it dashboard-app:v1 sh

This will open a shell to the container. You will have to navigate to /usr/share/nginx/html location and investigate its content. You will be able to see what was copied over from the Dist folder and adjust the Dockerfile aftewards.