Write docker logs to external log file - node.js

Question

We have a number of nodejs based microservices and all of them are running as docker containers.
Below is the content of dockerfile:
FROM keymetrics/pm2-docker-alpine:latest
ARG ENVIRONMENT
ARG PORT
ENV PORT $PORT
ENV ENVIRONMENT $ENVIRONMENT
RUN apt-get update -qq
RUN apt-get install --yes curl
RUN curl --silent --location https://deb.nodesource.com/setup_6.x | bash -
RUN apt-get install --yes nodejs
RUN apt-get install --yes build-essential vim
RUN mkdir /database_service
ADD . /database_service
WORKDIR /database_service
RUN npm install -g path
RUN npm cache clean
EXPOSE $PORT
CMD [ "npm", "start", $PORT, $ENVIRONMENT ]
Below is the command used to run the container
sudo docker run -p ${EXTERNAL_PORT_NUMBER}:${INTERNAL_PORT_NUMBER} --network
${NETWORK} --name ${SERVICE_NAME} --restart always -m 2048M --memory-swap -1
-itd ${ORGANISATION}/${SERVICE_NAME}:${VERSION}
I am looking for a way write contents of the logs generated by docker node based service to the external file on the Linux VM machine. If someone can help with sample command that will help.

Answer 1

You can do something like:
sudo docker run -p ${EXTERNAL_PORT_NUMBER}:${INTERNAL_PORT_NUMBER} --network
${NETWORK} --name ${SERVICE_NAME} --restart always -m 2048M --memory-swap -1
-itd ${ORGANISATION}/${SERVICE_NAME}:${VERSION} > /path/to/your/log.txt