Docker command is unable to find my configuration file

Question

Docker command is unable to find my configuration file

I have a pm2 Docker image for launching nodeJS process in production. The image can be found here: https://hub.docker.com/r/keymetrics/pm2/~/dockerfile/

Docker launch the command pm2-runtime start pm2.json and fails as it can't find any /pm2.json .

However I do have a pm2.json in the working directory, so why is it looking at the root / ?

I would also like to run the docker images with docker-compose. Is there something to configure in the docker-compose.yml file to look at the working directory ?

Answer 1

When I check the official Dockerfile :

FROM keymetrics/pm2:{{tag}}

# Bundle APP files
COPY src src/
COPY package.json .
COPY pm2.json .

# Install app dependencies
ENV NPM_CONFIG_LOGLEVEL warn
RUN npm install --production

# Show current folder structure in logs
RUN ls -al -R

CMD [ "pm2-runtime", "start", "pm2.json" ]

It is copying the npm2.json from the directory inside the image. Aren't you missing that part?

Answer 2

The default working directory for running binaries within a container is the root directory (/).

If you want to change it:

1. Using docker run : docker run -w="..."
2. Using docker-compose: working_dir is what you need, see: https://docs.docker.com/compose/compose-file/#domainname-hostname-ipc-mac_address-privileged-read_only-shm_size-stdin_open-tty-user-working_dir