docker build creates two images instead of one with the two components - node.js

Question

i want to build a easy web server to get in touch with docker compose but there are two images build and the webserver doesnt run.
app.js:
'use strict';
const cors = require('cors');
const { request } = require('express');
const express = require('express');
const {flaschenpost} = request('flaschenpost');
const http = require('http');
const logger = flaschenpost.getLogger();
const api = express();
api.use(cors());
api.get('/', (req,res) => {
res.json(
{
now: Date.now()
});
});
const server = http.createServer(api);
const port = 3_000;
server.listen(post, ()=> {
logger.info('Server started.', {port});
});
my Dockerfile looks like this:
FROM node:16.13.0-alpine
USER node
WORKDIR /home/node
COPY --chown=node:node ./package.json ./package.json
COPY --chown=node:node ./package-lock.json ./package-lock.json
RUN npm install --production
COPY --chown=node:node . .
CMD [ "node", "app.js"]
sudo docker build -t api
sudo docker run -d --init -p 3000:3000 --name api api
The output is after running docker ps
|REPO |TAG |IMAGE_ID |CREATED |SIZE |
|api |latest |f164f3da6ad2|4 minutes ago|127MB|
|node |16.13.0-alpine|44e24535dfbf|12 months ago|110MB|
curl http://localhost:3000
outputs this:
curl: (7) Failed to connect to localhost port 3000 after 0 ms: Connection refused

Answer 1

Something is wrong.
Dockerfile
FROM node:17
ENV NODE_ENV=production
WORKDIR /app
COPY ["package.json", "package-lock.json*", "./"]
RUN npm install --production
COPY . .
CMD [ "node", "index.js" ]
Now build it
docker build -t api .
Inspect image to if you get what you really want
docker inspect image api:latest
[
{
"Id": "sha256:7bbad5c790f4583e19b1dcf3b3c1aeb0a45fc46ad997d54222a51f1867e8789b",
"RepoTags": [
"api:latest"
],
"RepoDigests": [],
"Parent": "sha256:e58f7a2e8bb5c548475104eb813a6f12b8f610aa939b69de92d349116c2d9a00",
"Comment": "",
"Created": "2022-11-14T09:51:03.762665424Z",