Node.js: rerun the program when a file changes on a docker container

Question

For my project I have done the following Dockerfile in order to have a base to develop node.js with express.js applications:

FROM node:alpine
MAINTAINER "Desyllas Dimitrios"

ENV NEO4J_HOST=""
ENV NEO4J_USER=""
ENV NEO4J_PASSWORD=""
ENV MONGO_CONNECTION_STRING=""
ENV LOGS_DIR="/var/log/data_map"

COPY ./docker_scripts/entrypoint_dev.sh /usr/local/bin/entrypoint.sh

RUN chmod +x /usr/local/bin/entrypoint.sh &&\
    chown root:root /usr/local/bin/entrypoint.sh &&\
    mkdir -p /opt/map &&\
    mkdir -p /var/log/data_map &&\
    chmod 0666 /var/log/data_map &&\
    npm install nodemon -g

EXPOSE 7474
VOLUME /var/log/data_map
VOLUME /opt/map

WORKDIR /opt/map

ENTRYPOINT ["nodemon src/server.js"]

But over my project I have a folder containing twig templates, the folder is the src/views one. On my application I configurre the use of twig templates like this:

const express=require('express');
const app=express();

app.set('views', __dirname + '/views');
app.set('view engine', 'twig');
app.set('twig options', {
    strict_variables: false
});

And over a route I use:

router.get('/my-route',function(req,res,next){
  res.render('my-route.html.twig',{
    'title': "Main Panel"
  });
});

My question is how I will make my docker image to rerun the app even when the template has been changed? With the current use I cannot restart my app when a change happens over a template in order to reload the new one.

Please keep in mind that I run my nodejs application with nodemon in order to rerun the application during the file changes when I develop my software.

Edit 1:

What I want to do is to relaunch my application inside the container when I change over a template of even on frontend assets In the same way I relaunch it when I change server-side code.

Have you seen the api docs for the fs library? It fires an event whenever a watched file is updated, similarly to nodemon. — etchesketch
– etchesketch, Commented Jan 10, 2018 at 23:08
Well not exactly what I needed. It was my fault that I did not explained it well. — Dimitrios Desyllas
– Dimitrios Desyllas, Commented Jan 10, 2018 at 23:22

etchesketch · Accepted Answer · 2018-01-10 23:33:07Z

3

Nodemon allows you to specify other extensions to watch other than just javascript.

Try changing

ENTRYPOINT ["nodemon src/server.js"]

To

ENTRYPOINT ["nodemon -e js,twig src/server.js"]

You may need to pass more file extensions in your arguments for your use case.

answered Jan 10, 2018 at 23:33

etchesketch

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