Dockerfile 中的 COPY 在 docker 中有效，但在 kubernetes 中无效

Question

I am trying to deploy a simple HTML file to Kubernetes and host it using Nginx as a test. I am running into issues when copying over my website files.

Dockerfile

FROM nginx:alpine
COPY ./public /usr/share/nginx/html/

When I build this image and run it using docker run the website loads fine and I see my index.html file located in my public directory. If I try to run this in a pod using kubectl the files don't get copied over. All I see when I go to my site is the default Nginx welcome page. I am not sure why this is the case. the cluster is hosted on AWS EKS so it's remote to all the files. This is the same as I build and host my docker image on GitLab.

The image builds without any errors and as I said works fine when run in vanilla docker. It's only when I move over to Kubernetes that I run into issues.

I've made the project public so you guys can see all the abstractions that I might have left out in my question.

https://gitlab.com/k8group/k8site

Any help is appreciated.

Best Regards, Eddy.

Answer 1

I know if is only this, but in the quick glance I can say the key value in your ingress template must be pointing to the service port, not to the pod container port. Check the right config below:

    kind: Service
    apiVersion: v1
    metadata:
      name: k8site
    spec:
      selector:
        app: k8site
      ports:
        - port: 8080
          targetPort: 80
    ---
    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      annotations:
        ingress.kubernetes.io/cache-enable: "false"
      name: k8site-ingress
    spec:
      rules:
      - host: prod.pepefanclub.com
        http:
          paths:
          - backend:
              serviceName: k8site
              servicePort: 8080 <--- this must be the service port, that is 8080

Answer 2

So it looks like this was a case of the image not being pulled. I changed the commit tag from master to a hash and the site started working.

changing a variable in my ci pipeline from

IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG

to

IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA

thanks, @EugeneDW for pointing me in the correct direction.