我在将下一个 js 项目转换为 docker 时遇到错误

Question

我正在尝试将我的 Next js 项目转换为 Docker。我从下一个 js github 页面获得的 Dockerfile 对我来说工作得很好，并且我成功构建了。

# Install dependencies only when needed
FROM node:16-alpine AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

# Rebuild the source code only when needed
FROM node:16-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN yarn build

# Production image, copy all the files and run next
FROM node:16-alpine AS runner
WORKDIR /app

ENV NODE_ENV production

RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

# You only need to copy next.config.js if you are NOT using the default configuration
# COPY --from=builder /app/next.config.js ./
COPY --from=builder /app/public ./public
COPY --from=builder /app/package.json ./package.json

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
# COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

ENV PORT 3000

# Next.js collects completely anonymous telemetry data about general usage.
# Learn more here: https://nextjs.org/telemetry
# Uncomment the following line in case you want to disable telemetry.
# ENV NEXT_TELEMETRY_DISABLED 1

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

这是我后来写的。

docker run -p 3000:3000 imagename

然后我遇到了这样的错误，我无法解决它。

node:internal/modules/cjs/loader:936
  throw err;
  ^

Error: Cannot find module '/app/server.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

我在互联网上搜索了很多，但找不到太多。你觉得我应该怎么做？

Answer 1

确保您复制示例中的所有文件。在这种情况下，您需要确保您已添加或自定义了next.config.js以下内容：

module.exports = {
  output: 'standalone'
}

您会注意到示例中也定义了该文件：https://github.com/vercel/next.js/blob/canary/examples/with-docker/next.config.js

Answer 2

答案取决于您运行的 Next 版本。首先，您需要取消注释复制到 /appDockerfile的行server.js（以及文件夹的其余部分.next/standalone）。

COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./

然后，您需要在文件中包含以下内容之一next.config.js，具体取决于您运行的 Next 版本。

如果您正在运行 Next12.1.x或更早版本，那么您需要：

module.exports = {
  experimental: {
    outputStandalone: true,
  },
}

如果您正在运行12.2.x或稍后运行，请使用以下命令：

module.exports = {
  output: 'standalone',
}

这将导致创建 .next/standalone，并且该文件夹包含在内，server.js以便当COPY命令运行时，它和子文件夹将被放入 .next/standalone 中/app。