我有一个 React 前端应用程序,它通过 webpack 构建并使用 docker 进行容器化。
目标 : 是为了能够在docker中定义环境变量,并且能够在我的reactjs应用中访问环境变量。
docker-compose.yml
version: '3'
services:
portal:
build:
context: .
dockerfile: Dockerfile
environment:
- NODE_ENV=production
- PORT=8080
- API_URL=http://test.com
ports:
- "8080:8080"
例如我想访问这个
api_url
我的 reactjs 应用程序中的变量webpack.prod.js
const path = require('path');
const nodeExternals = require('webpack-node-externals');
const WebpackShellPlugin = require('webpack-shell-plugin');
const CopyWebpackPlugin = require("copy-webpack-plugin");
const {CleanWebpackPlugin} = require('clean-webpack-plugin');
const webpack = require('webpack');
const dotenv = require('dotenv');
console.log(process.env);
module.exports = [{
entry: {
app1: ["./src/public/app1/index.tsx"],
},
mode: NODE_ENV,
watch: NODE_ENV === 'development',
output: {
filename: "[name]/bundle.js",
path: path.resolve(__dirname, 'build/public/'),
},
// Enable sourcemaps for debugging webpack's output.
devtool: "source-map",
resolve: {
// Add '.ts' and '.tsx' as resolvable extensions.
extensions: [".ts", ".tsx", ".js", ".json", ".css", ".scss"]
},
module: {
rules: [
{ test: /\.tsx?$/, loader: "awesome-typescript-loader" },
// All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
{ enforce: "pre", test: /\.js$/, loader: "source-map-loader" },
{ test: /\.scss$/, use: [
{ loader: "style-loader" }, // to inject the result into the DOM as a style block
{ loader: "css-loader", options: { modules: true } }, // to convert the resulting CSS to Javascript to be bundled (modules:true to rename CSS classes in output to cryptic identifiers, except if wrapped in a :global(...) pseudo class)
{ loader: "sass-loader" }, // to convert SASS to CSS
] },
]
},
"plugins": [
// new CleanWebpackPlugin(),
new webpack.DefinePlugin({
'process.env.API_URL': JSON.stringify(process.env.API_URL)
}),
new CopyWebpackPlugin([
{
from: "src/public/app1/index.html",
to: "app1"
},
]),
],
// When importing a module whose path matches one of the following, just
// assume a corresponding global variable exists and use that instead.
// This is important because it allows us to avoid bundling all of our
// dependencies, which allows browsers to cache those libraries between builds.
externals: {
// "react": "React",
// "react-dom": "ReactDOM"
}
}]
您可以看到我正在尝试使用以下插件在 webpack 中设置环境变量
new webpack.DefinePlugin({
'process.env.API_URL': JSON.stringify(process.env.API_URL)
}),
问题 :你可以看到我在我的 webpack 配置中有控制台记录的 process.env 但没有显示我在 docker 中设置的任何环境变量。
语境:
DockerFile
FROM node:10.16.0-alpine
# Bundle APP files
WORKDIR /app
COPY ./ /app/
# Install app dependencies
ENV NPM_CONFIG_LOGLEVEL warn
RUN npm ci
RUN npm run build
npm
"build": "webpack --config webpack.prod.js",
最佳答案
您的 中的环境变量docker-compose.yml 文件仅在您的容器启动时可用。
如果您希望它们在构建过程中也可用,那么您可以使用构建参数:
version: '3'
services:
portal:
build:
context: .
dockerfile: Dockerfile
args:
- NODE_ENV=production
- PORT=8080
- API_URL=http://test.com
ports:
- "8080:8080"
然后,在您的 Dockerfile , 使用
ARG
声明构建参数命令,然后声明 ENV
变量,将它们设置为构建参数的值:FROM node:10.16.0-alpine
# Build args
ARG NODE_ENV
ARG PORT
ARG API_URL
# Environment vars
ENV NODE_ENV=$NODE_ENV
ENV PORT=$PORT
ENV API_URL=$API_URL
# Bundle APP files
WORKDIR /app
COPY ./ /app/
# Install app dependencies
ENV NPM_CONFIG_LOGLEVEL warn
RUN npm ci
RUN npm run build
我希望这有帮助。
关于reactjs - 如何在 docker 和 webpack 的 react 中访问环境变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56663119/