如何解决错误：在 kubernetes 上运行时找不到模块“react-dev-utils/chalk”？

Question

请不要将此标记为重复。我知道我以前曾问过这个问题，但我的问题没有得到解决。

我已经尝试在构建映像之前将 RUN npm install --save-dev react-dev-utils 添加到 dockerfile 中，但这并不能解决问题。

pod 的日志

> wootz@0.1.0 start /usr/src/app
> node scripts/start.js

internal/modules/cjs/loader.js:626
    throw err;
    ^

Error: Cannot find module 'react-dev-utils/chalk'
Require stack:
- /usr/src/app/scripts/start.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:623:15)
    at Function.Module._load (internal/modules/cjs/loader.js:527:27)
    at Module.require (internal/modules/cjs/loader.js:681:19)
    at require (internal/modules/cjs/helpers.js:16:16)
    at Object.<anonymous> (/usr/src/app/scripts/start.js:19:15)
    at Module._compile (internal/modules/cjs/loader.js:774:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:785:10)
    at Module.load (internal/modules/cjs/loader.js:641:32)
    at Function.Module._load (internal/modules/cjs/loader.js:556:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:837:10) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/usr/src/app/scripts/start.js' ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! wootz@0.1.0 start: `node scripts/start.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the wootz@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional log                                                                                                                                                             ging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-06-17T15_56_02_649Z-debug.log

uipersistantvolume

kind: PersistentVolume
apiVersion: v1
metadata:
  name: ui-initdb-pv-volume
  labels:
    type: local
    app: ui
spec:
  storageClassName: manual
  capacity:
    storage: 1Mi
  accessModes:
    - ReadOnlyMany
  hostPath:
    path: "/home/vignesh/pagedesigneryamls/client"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: ui-initdb-pv-claim-one
  labels:
    app: ui
spec:
  storageClassName: manual
  accessModes:
    - ReadOnlyMany
  resources:
    requests:
      storage: 1Mi

uipersistantvolumetwo

kind: PersistentVolume
apiVersion: v1
metadata:
  name: ui-initdb-pv-volume-two
  labels:
    type: local
    app: ui
spec:
  storageClassName: manual
  capacity:
    storage: 1Mi
  accessModes:
    - ReadOnlyMany
  hostPath:
    path: "/home/vignesh/pagedesigneryamls/client"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: ui-initdb-pv-claim-two
  labels:
    app: ui
spec:
  storageClassName: manual
  accessModes:
    - ReadOnlyMany
  resources:
    requests:
      storage: 1Mi

ui.yaml

apiVersion: v1
kind: Service
metadata:
  name: ui
  labels:
    app: ui
spec:

  ports:
  - name: myport
    port: 80
    targetPort: 3000

  selector:
    app: ui
    tier: frontend

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ui
  labels:
    app: ui
spec:
  selector:
    matchLabels:
      app: ui
      tier: frontend
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: ui
        tier: frontend
    spec:

      containers:
      - image: suji165475/devops-sample:updatedclientdockerfile
        name: ui
        ports:
        - containerPort: 80
          name: myport
        volumeMounts:
        - name: ui-persistent-storage-one
          mountPath: /usr/src/app
        - name: ui-persistent-storage-two
          mountPath: /usr/src/app/node_modules
      volumes:
      - name: ui-persistent-storage-one
        persistentVolumeClaim:
          claimName: ui-initdb-pv-claim-one
      - name: ui-persistent-storage-two
        persistentVolumeClaim:
          claimName: ui-initdb-pv-claim-two

ui yaml 中使用的镜像是使用以下 dockerfile 构建的

FROM node:12.4.0-alpine
RUN mkdir -p usr/src/app
WORKDIR /usr/src/app
COPY package.json package.json
RUN npm install && npm cache clean --force
RUN npm install -g webpack-cli
RUN npm install --save-dev react-dev-utils
WORKDIR /usr/src/app
COPY . .
WORKDIR /usr/src/app
EXPOSE 3000
RUN npm run build
CMD [ "npm","start" ]

docker-compose.yaml

version: "3"

services:
  pg_db:
    image: postgres
    networks: 
      - wootzinternal
    ports:
      - 5432
    environment:
      - POSTGRES_PASSWORD=password
      - POSTGRES_USER=postgres
      - POSTGRES_DB=wootz
    volumes:
      - wootz-db:/var/lib/postgresql/data
  apiserver:
    image: wootz-backend
    volumes:
      - ./api:/usr/src/app
      - /usr/src/app/node_modules
    build:
      context: ./api
      dockerfile: Dockerfile
    networks: 
      - wootzinternal
    depends_on:
      - pg_db
    ports:
      -  '8000:8000'
  ui:
    image: wootz-frontend
    volumes:
      - ./client:/usr/src/app
      - /usr/src/app/build
      - /usr/src/app/node_modules
    build:
      context: ./client
      dockerfile: Dockerfile
    networks:
      - wootzinternal
    ports:
      - '80:3000'

volumes:
  wootz-db:

networks:
  wootzinternal:
    driver: bridge

如何解决错误找不到模块'react-dev-utils/chalk'？？ dockerfile中是否缺少任何内容？或者有什么我应该删除的吗？？

注意：当使用 docker run 命令直接作为容器运行或使用 docker-compose 但在 kubernetes 上运行时，它会显示此错误。请帮助

Answer 1

不要将卷安装在容器文件所在的同一位置。

是的，它可以与 docker 一起使用。是的，它可以与 docker-compose 一起使用。

但您必须知道，kubernetes 处理卷的方式与 docker/docker-compose 不同

K8s 以类似于bind mount in docker 的方式挂载卷。这意味着，例如，k8s 卷没有预先填充位于卷安装路径下的容器内容。如果您在/usr/src/app 下挂载一个卷，则放置在那里的每个文件现在都消失了（或者由于绑定挂载而被隐藏）并且无法轻松访问。

那么在这种情况下你能做些什么呢？重新考虑您的应用程序设计，最重要的是：不要将卷安装在您保存文件的地方（如本例中的模块文件）。挂载卷时，选择容器中不存在的路径，或者存在且为空的路径。