Make a Docker application write to stdout

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An amazing recipe is given in the nginx Dockerfile:

# forward request and error logs to docker log collector
RUN ln -sf /dev/stdout /var/log/nginx/access.log \
    && ln -sf /dev/stderr /var/log/nginx/error.log

Simply, the app can continue writing to it as a file, but as a result the lines will go to stdout & stderr!

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