DOCKERFILE: Running multiple CMD. (Starting NGINX and PHP) [duplicate] - php

Question

This question already has answers here:
Why can't I use Docker CMD multiple times to run multiple services?
(5 answers)
Closed 4 years ago.
I have a dockerfile that sets up NGINX, PHP, adds a Wordpress Repository. I want at boot time, to start PHP and NGINX. However, I am failing to do so. I tried adding the two commands in the CMD array, and I also tried to put them in a shell file and starting the shell file. Nothing worked. Below is my Dockerfile
FROM ubuntu:16.04
WORKDIR /opt/
#Install nginx
RUN apt-get update
RUN apt-get install -y nginx=1.10.* php7.0 php7.0-fpm php7.0-mysql
#Add the customized NGINX configuration
RUN rm -f /etc/nginx/nginx.conf
RUN rm -f /etc/nginx/sites-enabled/*
COPY nginx/nginx.conf /etc/nginx/
COPY nginx/site.conf /etc/nginx/sites-enabled
#Copy the certificates
RUN mkdir -p /etc/pki/nginx
COPY nginx/certs/* /etc/pki/nginx/
RUN rm -f /etc/pki/nginx/placeholder
#Copy the build to its destination on the server
RUN mkdir -p /mnt/wordpress-blog/
COPY . /mnt/wordpress-blog/
#COPY wp-config.php
COPY nginx/wp-config.php /mnt/wordpress-blog/
#The command to run the container
CMD ["/bin/bash", "-c", "service php7.0-fpm start", "service nginx start"]
I tried to put the commands in the CMD in a shell file, and run the shell file in the CMD command. It still didn't work. what am i missing?

Answer 1

start.sh
#!/bin/bash
/usr/sbin/service php7.0-fpm start
/usr/sbin/service nginx start
tail -f /dev/null
Dockerfile
COPY ["start.sh", "/root/start.sh"]
WORKDIR /root
CMD ["./start.sh"]
With this, you can put more complex logic in start.sh.

Answer 2

You can replace the CMD line for some like ...
CMD ["/bin/bash", "-c", "/usr/sbin/service php7.0-fpm start && nginx -g 'daemon off;'"]

Answer 3

TL;DR: You don't have an entry point.
Main idea in the Docker is to have one responsibility per container. So, in order to keep running a Docker container you have to start a program in foreground upon container boot.
However, in your Dockerfile, there is no entrypoint to start a program in foreground. So, just after your container boot, your container exits.
So, in order to prevent your container from exiting, just start a program in foreground.
Nginx for instance.
Example scenario:
entrypoint.sh content:
#!/bin/bash
service php7.0-fpm start
nginx -g 'daemon off;
somewhere in Dockerfile:
COPY [ "./entrypoint.sh", "/root/entrypoint.sh" ]
at the end of the Dockerfile:
ENTRYPOINT /root/entrypoint.sh