running two nodejs apps in one docker image
how can i run two different nodejs apps in one docker image?
CMD [ "node", "app.js"] and
CMD [ "node", "otherapp.js"] won’t work, cause there can be only one
CMD directive in Dockerfile.
One Solution collect form web for “running two nodejs apps in one docker image”
I recommend using
pm2 as the entrypoint process which will handle all your NodeJS applications within docker image. The advantage of this is that
pm2 can bahave as a proper process manager which is essential in docker. Other helpful features are load balancing, restarting applications which consume too much memory or just die for whatever reason, and log management.
Dockerfile I’ve been using for some time now:
#A lightweight node image FROM mhart/alpine-node:6.5.0 #PM2 will be used as PID 1 process RUN npm install -g firstname.lastname@example.org # Copy package json files for services COPY app1/package.json /var/www/app1/package.json COPY app2/package.json /var/www/app2/package.json # Set up working dir WORKDIR /var/www # Install packages RUN npm config set loglevel warn \ # To mitigate issues with npm saturating the network interface we limit the number of concurrent connections && npm config set maxsockets 5 \ && npm config set only production \ && npm config set progress false \ && cd ./app1 \ && npm i \ && cd ../app2 \ && npm i # Copy source files COPY . ./ # Expose ports EXPOSE 3000 EXPOSE 3001 # Start PM2 as PID 1 process ENTRYPOINT ["pm2", "--no-daemon", "start"] # Actual script to start can be overridden from `docker run` CMD ["process.json"]
process.json file in the
CMD is described here