docker initを試してみる

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Windows 10 Professional
WSL2 (Ubuntu22.04 LTS)
Docker Desktop 4.19.0 (106363) 
docker version 23.0.5
Docker Compose version v2.17.3

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~/work/docker-init-nodejs
としてプロジェクトフォルダを作成した。

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docker init

Welcome to the Docker Init CLI!

This utility will walk you through creating the following files with sensible defaults for your project:
  - .dockerignore
  - Dockerfile
  - compose.yaml

Let's get started!

? What application platform does your project use?  [Use arrows to move, type to filter]
  Go - suitable for a Go server application
  Python - suitable for a Python server application
  Node - suitable for a Node server application
> Other - general purpose starting point for containerizing your application
  Don't see something you need? Let us know!
  Quit

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? What application platform does your project use? Node
? What version of Node do you want to use? 18.16.0

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? Which package manager do you want to use? npm

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? What command do you want to use to start the app? npm run serve

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? What port does your server listen on? 8888

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$ docker init

Welcome to the Docker Init CLI!

This utility will walk you through creating the following files with sensible defaults for your project:
  - .dockerignore
  - Dockerfile
  - compose.yaml

Let's get started!

? What application platform does your project use? Node
? What version of Node do you want to use? 18.16.0
? Which package manager do you want to use? npm
? What command do you want to use to start the app? npm run serve
? What port does your server listen on? 8888

CREATED: .dockerignore
CREATED: Dockerfile
CREATED: compose.yaml

✔ Your Docker files are ready!

Take a moment to review them and tailor them to your application.

WARNING: The following files required to run your application were not found. Be sure to create them before running your application:
  - package.json
  - package-lock.json

When you're ready, start your application by running: docker compose up --build

Your application will be available at http://localhost:8888

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$ ls
Dockerfile  compose.yaml

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# syntax=docker/dockerfile:1

# Comments are provided throughout this file to help you get started.
# If you need more help, visit the Dockerfile reference guide at
# https://docs.docker.com/engine/reference/builder/

ARG NODE_VERSION=18.16.0

FROM node:${NODE_VERSION}-alpine

# Use production node environment by default.
ENV NODE_ENV production


WORKDIR /usr/src/app

# Download dependencies as a separate step to take advantage of Docker's caching.
# Leverage a cache mount to /root/.npm to speed up subsequent builds.
# Leverage a bind mounts to package.json and package-lock.json to avoid having to copy them into
# into this layer.
RUN --mount=type=bind,source=package.json,target=package.json \
    --mount=type=bind,source=package-lock.json,target=package-lock.json \
    --mount=type=cache,target=/root/.npm \
    npm ci --omit=dev

# Run the application as a non-root user.
USER node

# Copy the rest of the source files into the image.
COPY . .

# Expose the port that the application listens on.
EXPOSE 8888

# Run the application.
CMD npm run serve

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# Comments are provided throughout this file to help you get started.
# If you need more help, visit the Docker compose reference guide at
# https://docs.docker.com/compose/compose-file/

# Here the instructions define your application as a service called "server".
# This service is built from the Dockerfile in the current directory.
# You can add other services your application may depend on here, such as a
# database or a cache. For examples, see the Awesome Compose repository:
# https://github.com/docker/awesome-compose
services:
  server:
    build:
      context: .
    environment:
      NODE_ENV: production
    ports:
      - 8888:8888

# The commented out section below is an example of how to define a PostgreSQL
# database that your application can use. `depends_on` tells Docker Compose to
# start the database before your application. The `db-data` volume persists the
# database data between container restarts. The `db-password` secret is used
# to set the database password. You must create `db/password.txt` and add
# a password of your choosing to it before running `docker-compose up`.
#     depends_on:
#       db:
#         condition: service_healthy
#   db:
#     image: postgres
#     restart: always
#     user: postgres
#     secrets:
#       - db-password
#     volumes:
#       - db-data:/var/lib/postgresql/data
#     environment:
#       - POSTGRES_DB=example
#       - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
#     expose:
#       - 5432
#     healthcheck:
#       test: [ "CMD", "pg_isready" ]
#       interval: 10s
#       timeout: 5s
#       retries: 5
# volumes:
#   db-data:
# secrets:
#   db-password:
#     file: db/password.txt

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docker compose up -d --build

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failed to solve: failed to compute cache key: failed to calculate checksum of ref moby::ntgwio6umva0ica7fl12wc17l: "/package.json": not found

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This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help init` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg>` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
package name: (docker-init-nodejs)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to work/docker-init-nodejs/package.json:

{
  "name": "docker-init-nodejs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}


Is this OK? (yes)

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npm install

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✔ Container docker-init-nodejs-server-1  Started

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const http = require('http');
const express = require('express');

const app = express();

app.get("/", function(req, res){
    return res.send("Hello World");
});

const server = http.createServer(app);
server.listen(8888);

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-CMD npm run serve
+CMD node index.js

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docker compose up -d --build

NAME                          IMAGE                       COMMAND                  SERVICE             CREATED
   STATUS              PORTS
docker-init-nodejs-server-1   docker-init-nodejs-server   "docker-entrypoint.s…"   server              5 seconds ago       Up 3 seconds        0.0.0.0:8888->8888/tcp