nodemon 在 kubernetes 环境中运行时未启动

Question

I am working on containerizing a nodejs app to be running on GKE. the scripts section of package.json looks like this

  "scripts": {
    "dev": "npm-run-all --parallel dev:build-server dev:build-client  dev:server",
    "dev:server": "nodemon -L --watch build --exec node build/bundle.js",
    "dev:build-server": "webpack --config webpack.server.js --watch",
    "dev:build-client": "webpack --config webpack.client.js --watch"
  }, 

so when running im using npm run dev to start them all.

this works perfectly while it is running on VM. But when run as a container in kubernetes the nodemon process won't start. nor it listens on the port. it gives a 502 status error on browser

but when you ssh to the pod and try running the command it starts the process.listens on 3001 port but obviously it gives routes not found on browser. since they are not linked as expected.

below is the dockerfile

FROM node:10.19-stretch
ENV USER="vue" UID="1001"


RUN apt-get update --fix-missing
RUN apt-get install -yq curl
RUN rm /bin/sh && ln -s /bin/bash /bin/sh && \
    mkdir -p /opt/vue && \
    addgroup --system -gid $UID $USER && \
    adduser --system --uid $UID --gid $UID $USER

WORKDIR /opt/vue

COPY dashboard/. /opt/vue/


RUN npm cache clean --force && \
    npm install  && \
    npm cache verify  && \
    chown $USER.$USER -R /opt/vue

USER $USER
EXPOSE 3001
# ENTRYPOINT ["/usr/bin/dumb-init","--"]
# CMD ["npm run dev"]
CMD ["npm", "run", "dev" ]

tried using base images ( node:10.19-stretch,node:10.19.0-alpine3.11 ) some had sugested installing inotify but even that didn't work. what am I missing. please help.

UPDATE ---

when run either in docker or kubernetes standerout log says this with no errors(enabled verbose output)

[nodemon] Looking in package.json for nodemonConfig
  Usage: nodemon [nodemon options] [script.js] [args]

  See "nodemon --help" for more.

[nodemon] exiting

Answer 1

after some peer reviewing and posting this on other networks found the correct answer.

issue behind was obvious. in the scripts section the all dev:* scripts were running parallel. so when the two build steps were running the nodemon service was trying to start the service. and since the build/bundle.json is not there it gives a file not found. but the nodemon thinks of it as invalid arguments and gives the command help.

so what I did was adding the build steps in the docker file by running

npm run dev

and then on the CMD adding the

npm run prod:server

which actually speeded up the startupt time too.

here is the dockerfile part that was changed.

RUN npm cache clean --force && \
    npm install  && \
    npm cache verify  && \
    chown $USER.$USER -R /opt/vue

USER $USER
EXPOSE 3001

CMD ["npm", "run", "prod:server" ]

also I had removed nodemon as its not needed. since files will not be changed anyway and they are too bulky

  "scripts": {
    "dev": "npm-run-all --parallel dev:build-server dev:build-client",
    "prod:server": "node build/bundle.js",
    "dev:build-server": "webpack --config webpack.server.js --watch",
    "dev:build-client": "webpack --config webpack.client.js --watch"
  },

finally.. !! viola.. it worked.

Thanks everyone who put their precious time on this.