run cronjob and supervisor in dockerfile - docker

Question

I am new to docker and trying to run supervisor and corn , but in this file it is just running
supervisor.
I know the problem is with last line but how can I fix it?
FROM php:7.4-fpm
# Copy composer.lock and composer.json
COPY composer.lock composer.json /var/www/
# Set working directory
WORKDIR /var/www
# Install dependencies
RUN apt-get update && apt-get install -y \
libonig-dev\
build-essential \
libpng-dev \
libjpeg62-turbo-dev \
libfreetype6-dev \
locales \
zip \
jpegoptim optipng pngquant gifsicle \
vim \
unzip \
git \
curl \
libzip-dev
# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*
# Install extensions
RUN docker-php-ext-install pdo_mysql mbstring zip exif pcntl
RUN docker-php-ext-configure gd --with-freetype --with-jpeg
RUN docker-php-ext-install gd
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
RUN apt-get update
RUN apt-get update && apt-get install -y cron
COPY /docker/crontab /etc/cron.d/crontab
#
# Give execution rights on the cron job
RUN chmod 0644 /etc/cron.d/crontab
RUN crontab /etc/cron.d/crontab
# Create the log file to be able to run tail
RUN touch /var/log/cron.log
RUN apt-get update && apt-get install -y supervisor
COPY docker/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
CMD /usr/bin/supervisord ; cron && tail -f /var/log/cron.log

Answer 1

Because you are using ";" after the supervisord command, the command waits for supervisord to finish and after that cron will run. You can make it like:
CMD /usr/bin/supervisord & cron && tail -f /var/log/cron.log
so the supervisord will run in the back ground.
If you want the container to fail if supervisord fails, you can do it like:
CMD cron && tail -f /var/log/cron.log & /usr/bin/supervisord