Docker - Unable to start Webpack Dev Server on Kubernetes Cluster - docker

Question

I am trying to start Webpack Dev Server in a Rails app on a Digital Ocean Kubernetes Cluster. I can't figure out the correct command. The app works in Docker locally.
I keep getting errors like this:
Error: failed to start container "exactpos-webpack": Error response from
daemon: OCI runtime create failed: container_linux.go:348: starting
container process caused "exec: \"bin/bash\": stat bin/bash: no such
file or directory": unknown Back-off restarting failed container
Here is the code from my docker-compose.yml file:
webpack_dev_server: build: .
command: ./bin/webpack-dev-server
ports:
- 3035:3035
volumes:
- .:/usr/src/app
- gem_cache:/gems
env_file:
- .env/development/web
- .env/development/database environment:
- WEBPACKER_DEV_SERVER_HOST=0.0.0.0
Here is my kubectl deployment yaml file:
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: exactpos-webpack
spec:
replicas: 1
minReadySeconds: 150
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
selector:
matchLabels:
app: exactpos-webpack
tier: webpack
template:
metadata:
name: exactpos-webppack
labels:
app: exactpos-webpack
tier: webpack
spec:
imagePullSecrets:
- name: dockerhub-cred
containers:
- name: exactpos-webpack
image: index.docker.io/markhorrocks/exactpos_webpacker_dev_server:prod
command: ["bin/bash","-c", "./bin/webpack_dev_server"]
imagePullPolicy: Always
ports:
- containerPort: 3500
readinessProbe:
tcpSocket:
port: 3500
initialDelaySeconds: 150
timeoutSeconds: 5
periodSeconds: 5
failureThreshold: 10
livenessProbe:
tcpSocket:
port: 3500
initialDelaySeconds: 120
timeoutSeconds: 5
periodSeconds: 5
failureThreshold: 10
env:
- name: RAILS_LOG_TO_STDOUT
value: "true"
- name: RAILS_SERVE_STATIC_FILES
value: "true"
- name: DATABASE_NAME
value: "exactpos_production"
- name: DATABASE_PORT
value: "5432"
- name: DATABASE_URL
value: "postgres"
- name: DATABASE_USER
valueFrom:
secretKeyRef:
name: "db-user"
key: "username"
- name: DATABASE_PASSWORD
valueFrom:
secretKeyRef:
name: "db-user-pass"
key: "password"
- name: REDIS_URL
value: "redis"
- name: REDIS_PORT
value: "6379"
- name: RAILS_ENV
value: "production"
- name: WEBPACKER_DEV_SERVER_HOST
value: "0.0.0.0"
- name: SECRET_KEY_BASE
valueFrom:
secretKeyRef:
name: "secret-key-base"
key: "secret-key-base"

Answer 1

Your deployment.yaml has following :
command: ["bin/bash","-c", "./bin/webpack_dev_server"]
There is no bin/bash present in docker image. It should be like:
command: ["/bin/bash","-c", "./bin/webpack_dev_server"]
I believe, it will resolve your problem.
EDIT1: I again looked at your docker-compose.yml file and see the following line:
volumes:
- .:/usr/src/app
It means at run time of docker you copied all the files from . directory to /usr/src/app. Is the config/webpacker.yml was present at that location? OR you overlayed /usr/src/app from whatever it was in . directory at the run time. Could you please share DockerFile of your app as well to better understanding?