NodeJS'appendFile'不在Docker容器中创建文件

Question

I have an application that creates a few CSV files in its working directory while it runs. The application runs fine outside of my docker container, but when I run it within, I get an error:

Error: ENOENT: no such file or directory, open 'Data/Output.csv'

The file is written using the below function call in a myApp.js file. I have tried using absolute/relative path and setting flags explicitly in the third parameter of appendFile. Same error every time.

fs.appendFile('Data/Output.csv', Text, (err) => {
        if (err) throw err;
});

For debugging, I did a touch Output.csv and set the following line in my Dockerfile to see if the file is actually there, and below is the output of that.

Step 7/8 : RUN ls -al ~/myApp/src/Data
 ---> Running in 2dfabf2dd92b
total 8
drwxr-xr-x 2 root root 4096 Feb  7 16:17 .
drwxr-xr-x 5 root root 4096 Feb  7 16:17 ..
-rw-r--r-- 1 root root    0 Feb  7 16:17 .gitkeep
-rwxrwxrwx 1 root root    0 Feb  7 16:17 Output.csv

Yet when I docker run myApp/myApp I get the error that there is no such file or directory.

My Dockerfile:

FROM ubuntu

#Install dependencies
RUN apt update -y && apt install -y git ssh nodejs npm gconf-service libasound2 libatk1.0-0 libc6 libcairo2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget

#install go and libraries
RUN wget https://dl.google.com/go/go1.13.7.linux-amd64.tar.gz && tar -C /usr/local -xzf go1.13.7.linux-amd64.tar.gz && <some git clones of private repos>

#clone from local repo    
ARG SSH_PRIVATE_KEY
ARG SSH_CONFIG
RUN mkdir ~/.ssh && chmod 0700 ~/.ssh && ssh-keyscan <private repo> ~/.ssh/known_hosts && echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_ed25519 && echo "${SSH_CONFIG}" > ~/.ssh/config && chmod 0600 ~/.ssh/id_ed25519 && cd ~/ && git clone <private repo> && rm -rf ~/.ssh && touch ~/myApp/src/Data/Output.csv && chmod 777 ~/myApp/src/Data/Output.csv && cd ~/myApp/src && npm install

#CMD ["node", "root/myApp/src/myApp.js"]
ENTRYPOINT /bin/bash #for debugging

Answer 1

Your WORKDIR is not set properly for relative path to work as you expect it to work. Example of your Dockerfile with added WORKDIR and changed CMD . ( Also check whether or not you have folder Data already created, if not it can also result in error )

FROM ubuntu
RUN apt update -y && apt install -y git ssh nodejs npm gconf-service libasound2 libatk1.0-0 libc6 libcairo2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget
RUN wget https://dl.google.com/go/go1.13.7.linux-amd64.tar.gz && tar -C /usr/local -xzf go1.13.7.linux-amd64.tar.gz && <some git clones of private repos>
ARG SSH_PRIVATE_KEY
ARG SSH_CONFIG
RUN mkdir ~/.ssh && chmod 0700 ~/.ssh && ssh-keyscan <private repo> ~/.ssh/known_hosts && echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_ed25519 && echo "${SSH_CONFIG}" > ~/.ssh/config && chmod 0600 ~/.ssh/id_ed25519 && cd ~/ && git clone <private repo> && rm -rf ~/.ssh && touch ~/myApp/src/Data/Output.csv && chmod 777 ~/myApp/src/Data/Output.csv && cd ~/myApp/src && npm install
WORKDIR /root/src
CMD ["node", "app.js"]