How to terminate nodejs process inside container

General
1

I have a container that must or must not start nodejs app inside container depending on .env settings.

docker-compose.yml
version: “3.5”

services:
  php:
    build:
      context: ./
      dockerfile: docker/php/Dockerfile
    ports:
      - 9234:9000
    restart: always
    working_dir: /var/www
    volumes:
      - ./:/var/www:cached

docker/php/Dockerfile:

FROM php:7.1-fpm
WORKDIR /var/www

RUN apt-get update -yq \
    && apt-get install curl gnupg -yq \
    && curl -sL https://deb.nodesource.com/setup_10.x | bash \
    && apt-get install nodejs -yq

CMD ["node", "appNodejs/server.js"]

I need to exec or discard
CMD [“node”, “appNodejs/server.js”]
command depending on env file params. I didn’t find out how to get it with Dockerfile, so I check env file inside my server.js and do
process.exit(0)
if node server isn’t required. But docker continuously restarting server.js and i’m getting:

app_php_1 exited with code 0
app_php_1 exited with code 0
app_php_1 exited with code 0
app_php_1 exited with code 0
app_php_1 exited with code 0
app_php_1 exited with code 0
app_php_1 exited with code 0

Also I’m getting on startup:

Error: Cannot find module '/var/www/appNodejs/server'

I think it’s because of volumes are attached after CMD [“node”, “appNodejs/server.js”] - how to fix it?
How to terminate node process so it wouldn’t be starting again?

2

Hi, volumes are attached “on boot”, so it will be there when the CMD is exectuted, but, it could be the “:cached” in your volume mount, try and remove that part.

Is restarted because you made it as a service, so docker will continue to try to get your container up and running, also becaues you defined: restart: always
And it exits because of the error you mentioned.

3

Thanks! But how can I shutdown a node service or better is to not to start it depending on env file parameter?

4

What do you mean by stopping it? Why do you want to stop it? at what conditions?

5

In the docker/php/Dockerfile I want to start php-fpm as main service. But CMD [“node”, “appNodejs/server.js”] should or should not starting based on my env file. So I need something like this:

FROM php:7.1-fpm
WORKDIR /var/www
# here I want to start php-fpm as it my main service

RUN apt-get update -yq \
    && apt-get install curl gnupg -yq \
    && curl -sL https://deb.nodesource.com/setup_10.x | bash \
    && apt-get install nodejs -yq

# start nodejs app by condition only
if (condition) { 
    CMD ["node", "appNodejs/server.js"]
}

I didn’t find how to add if statement like this in dockerfile, so maybe terminating server.js inside itself is workaround.

6

Okay, the best way to do this, would be to create a custom start script.
So you in the start shell script check what process should be run and execute.

7

Sorry, it’s about entrypoint script?

8

yes it is, like you create a bash script in /startup.sh, and in that you check and and execute what you need.
and then define /startup.sh as the entrypoint