Make a Docker application write to stdout

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!

For a background process in a docker container, e.g. connecting with exec to /bin/bash I was able to use.

echo "test log1" >> /proc/1/fd/1

This sends the output to the stdout of pid 1, which is the one docker pickups up.

Make a Docker application write to stdout

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