Marcin Nabiałek Marcin Nabiałek - 7 months ago 20
PHP Question

SSH in Docker container causes HTTP 404

I have such simple

dockerfile
for PHP:

# Base image
FROM php:7-fpm

# Update packages list
RUN apt-get --yes update;

# Install SSH server, set root password and allow root login
RUN apt-get --yes install openssh-server
RUN mkdir /var/run/sshd
RUN echo 'root:123' | chpasswd
RUN sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# Run SSH server
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]


And such
docker-compose.yml
file

web:
image: nginx:latest
volumes:
- /c/Users/marcin/dock-test/composers/l1.app/html/:/usr/share/nginx/html/
- /c/Users/marcin/dock-test/composers/l1.app/nginx/conf.d/:/etc/nginx/conf.d/
- /c/Users/marcin/dock-test/composers/l1.app/nginx/log/:/var/log/nginx/
ports:
- "8080:80"
working_dir: /usr/share/nginx/html/
links:
- php
- db
container_name: l1.web
environment:
- VIRTUAL_HOST=l1.app
php:
build: ../builds
dockerfile: Dockerfile-php7-fpm
volumes:
- /c/Users/marcin/dock-test/composers/l1.app/html/:/usr/share/nginx/html/
- /c/Users/marcin/dock-test/composers/l1.app/php/config/:/usr/local/etc/php/
working_dir: /usr/share/nginx/html/
links:
- db
container_name: l1.php
ports:
- "22020:22"
db:
image: mysql:5.7
environment:
- MYSQL_ROOT_PASSWORD=pass
- MYSQL_DATABASE=
- MYSQL_USER=
- MYSQL_PASSWORD=
expose:
- 3306
volumes:
- /c/Users/marcin/dock-test/composers/l1.app/mysql/data/:/var/lib/mysql/
- /c/Users/marcin/dock-test/composers/l1.app/mysql/conf.d/:/etc/mysql/conf.d/
- /c/Users/marcin/dock-test/composers/l1.app/mysql/log/:/var/log/mysql/
ports:
- "33060:3306"
container_name: l1.db


The problem - everything is working fine until I add in my dockerfile the last shown line:

CMD ["/usr/sbin/sshd", "-D"]


If I add this line, SSH is working fine but I'm getting 404 when displaying the page. When I comment this line, I'm getting page without a problem but obviously this SSH is not working.

What could be the problem with this? I just want to add I need this SSH service in PHP container (and running
docker exec
in this case is not an option)

Answer

The base image php-fpm ends with

CMD ["php-fpm"]

Your own CMD would override that (meaning php .

One workaround would be at least to ADD and call a wrapper script which would:

  • call php-fpm
  • launch sshd daemon

But that wouldn't play well with stop/kill signals, which would not stop everything. There are special images for managing more than one main process.

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