How to keep docker pod without entrypoint running in K8S?

Question

I have the following dockerfile:

FROM node:8 as build
RUN mkdir /usr/src/app
WORKDIR /usr/src/app
ENV PATH /usr/src/app/node_modules/.bin:$PATH
COPY package.json /usr/src/app/package.json
RUN npm install
COPY . /usr/src/app

publish to our artifactory. However, as there is no command / entrypoint provided, the docker would simply end immediately. so I usually use docker run -d -t to run it. However, when deploying it in kubernetes, I cannot specify the args -d and -t since I will get an error that node does not know the arguments -d and -t.

When adding the following entrypoint,

ENTRYPOINT [ "tail", "-f", "/dev/null"]

The machine keeps crashing

How can I keep the pod running in background?

How you run that docker image on k8s. Are you using kubectl run command ? — mchawre, Aug 13 '19 at 06:06
it is a protractor test machine that will start the protractor as a kubernetes job as soon as the test environment is start up — user66875, Aug 13 '19 at 06:16

mchawre · Accepted Answer · 2019-08-13T06:17:50.287

2

Make use of -i and --tty option of kubectl run command.

kubectl run -i --tty --image=<image> <name> --port=80 --env="DOMAIN=cluster"

More info here.

Update:

In case of yaml files make use of stdin and tty option.

apiVersion: v1 
kind: Pod 
metadata: 
  name: testpod
spec: 
  containers: 
    - name: testpod
      image: testimage
      stdin: true
      tty: true

More info here.

edited Aug 13 '19 at 06:17

answered Aug 13 '19 at 06:10

mchawre

10,744
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score 0 · Answer 2 · answered Aug 09 '22 at 10:22

0

I got the same case. Besides

      stdin: true
      tty: true

I also need to add:

      command:
        - /bin/bash

answered Aug 09 '22 at 10:22

RickeyShao

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How to keep docker pod without entrypoint running in K8S?

2 Answers2