Dockerfile supervisord cannot find path

Question

For some reason supervisord cannot start up when executing docker run... If I log out the path where the configuration is stored for supervisord I can clearly see that the file is present.

Below is the part of my Dockerfile thats not currently commented out.

FROM ubuntu:16.04
MAINTAINER Kevin Gilbert

# Update Packages
RUN apt-get -y update

# Install basics
RUN apt-get -y install curl wget make gcc build-essential

# Setup Supervisor
RUN apt-get -y install supervisor
RUN mkdir -p /var/log/supervisor

COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf

CMD ["/usr/bin/supervisord", "-c /etc/supervisor/conf.d/supervisord.conf"]

Here is the error I get in terminal after running.

remote-testing:analytics-portal kgilbert$ docker run kmgilbert/portal
Error: could not find config file  /etc/supervisor/conf.d/supervisord.conf
For help, use /usr/bin/supervisord -h

Answer 1

Try with the exec form of CMD:

CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]

or with the shell form

CMD /usr/bin/supervisord -c /etc/supervisor/conf.d/supervisord.conf

Depending on the OS used by the base image, you might not even have to specify the supervisord.conf in the command line (see this example, or the official documentation)

Answer 2

It happended to me on Alpine linux 3.9, but eventually ran successfully with

CMD ["supervisord", "-c", "<path_to_conf_file>"]