How do I force Kubernetes to re-pull an image?

kubectl rollout restart
imagepullpolicy kubernetes
kubectl rolling-update
kubernetes auto update image
kubectl docker image
kubectl restart pod
kubernetes pre-pull image
kubectl push image

I have the following replication controller in Kubernetes on GKE:

apiVersion: v1
kind: ReplicationController
metadata:
  name: myapp
  labels:
    app: myapp
spec:
  replicas: 2
  selector:
    app: myapp
    deployment: initial
  template:
    metadata:
      labels:
        app: myapp
        deployment: initial
    spec:
      containers:
      - name: myapp
        image: myregistry.com/myapp:5c3dda6b
        ports:
        - containerPort: 80
      imagePullPolicy: Always
      imagePullSecrets:
        - name: myregistry.com-registry-key

Now, if I say

kubectl rolling-update myapp --image=us.gcr.io/project-107012/myapp:5c3dda6b

the rolling update is performed, but no re-pull. Why?

How do I force Kubernetes to re-pull an image?, Docker may allow you to mutate tags on images, but I think that the Kubernetes philosophy (and hard-won experience of running containerized  User wants to do something here to tell the Deployment to pull the new image and do a rolling-update of existing pods; The problem is that there is no existing Kubernetes mechanism which properly covers this. Current Workarounds. Always change the image tag when deploying a new version

One has to group imagePullPolicy inside the container data instead of inside the spec data. However, I filed an issue about this because I find it odd. Besides, there is no error message.

So, this spec snippet works:

spec:
  containers:
  - name: myapp
    image: myregistry.com/myapp:5c3dda6b
    ports:
    - containerPort: 80
    imagePullPolicy: Always
  imagePullSecrets:
    - name: myregistry.com-registry-key

Force pods to re-pull an image without changing the image tag , I have set up a kubernetes cluster on GKE. My replication controller YAML: apiVersion: v1 kind: successful but there's no re-pull of the image. Pull an Image from a Private Registry. This page shows how to create a Pod that uses a Secret to pull an image from a private Docker registry or repository. Before you begin. You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

My hack during development is to change my Deployment manifest to add the latest tag and always pull like so

image: etoews/my-image:latest
imagePullPolicy: Always

Then I delete the pod manually

kubectl delete pod my-app-3498980157-2zxhd

Because it's a Deployment, Kubernetes will automatically recreate the pod and pull the latest image.

Re-pulling image in kubernetes, if you're manually trying to restart then use the following command, it deleted and recreates the pod. kubectl replace --force -f  I have set up a kubernetes cluster on GKE. My replication controller YAML: apiVersion: v1 kind: successful but there's no re-pull of the image 35135/re-pulling-image-in-kubernetes

A popular workaround is to patch the deployment with a dummy annotation (or label):

kubectl patch deployment <name> -p \
  "{\"spec\":{\"template\":{\"metadata\":{\"annotations\":{\"date\":\"`date +'%s'`\"}}}}}"

Assuming your deployment meets these requirements, this will cause K8s to pull any new image and redeploy.

Retry pull image in a kubernetes pod, Question: How do I force Kubernetes to re-pull an image? I have the following replication controller in Kubernetes on GKE: apiVersion: v1 kind:  I'm a noob when it comes to kubernetes. I was just experimenting with a few commands, i tried . kubectl get pods. Result: NAME READY STATUS RESTARTS AGE mysql-apim-db-1viwg 1/1 Running 1 20h mysql-govdb-qioee 1/1 Running 1 20h mysql-userdb-l8q8c 1/1 Running 0 20h wso2am-default-813fy 0/1 ImagePullBackOff 0 20h

There wil be a new comand to directly do that:

Create a new kubectl rollout restart command that does a rolling restart of a deployment.

The pull request got merged. It will be part of the version 1.15 (changelog)

How do I force Kubernetes to re-pull an, pod is ImgaePullBackOff the sytem automatically tries to re-pull the image in a matter of minutes, kubectl replace --force -f <pod yaml file>. How do I force Kubernetes to re-pull an image? Mohamed Ettayeb-May 23, 2019. 0. Question: How do I force Kubernetes to re-pull an image?

How to retry image pull in a kubernetes Pods?, This topic describes how to create a Docker registry secret. the image to pull from Oracle Cloud Infrastructure Registry (along with the Docker secret to use) during is the key for the Oracle Cloud Infrastructure Registry region you're using. Edit This Page Images. You create your Docker image and push it to a registry before referring to it in a Kubernetes pod. The image property of a container supports the same syntax as the docker command does, including private registries and tags.

Pulling Images from Registry during Kubernetes Deployment, the rolling update is performed, but no re-pull. Why? Kubernetes will pull upon Pod creation if either (see updating-images doc):. Using images tagged :latest  A container image represents binary data that encapsulates an application and all its software depencies. Container images are executable software bundles that can run standalone and that make very well defined assumptions about their runtime environment. You typically create a container image of your application and push it to a registry before referring to it in a PodA Pod represents a set

Cannot pull image :: WebLogic Kubernetes Operator, There is another setting called imagePullPolicy that can be used to force Kubernetes to always pull the image, even if it is already present in the local Docker  This quick tutorial is going to cover how to pull a Docker image and run a container. 1. List or Search For a Docker Image. Before we can pull a Docker image and run a container, we should know its name first. And to do that, we can go to the Docker hub or Docker store to search for any name.

Comments
  • I gave a different image, just with the same tag. If it is necessary to give a different tag, well, I see no point in the imagePullPolicy field.
  • I want to use a specific tag, but its newest version.
  • @TorstenBronger I think this is a breaking change in Kubernetes/Docker theory. The idea that you could pull image:tag (other than latest) at two different times and get two different images would be problematic. A tag is akin to a version number. It would be better practice to always change the tag when the image changes.
  • It depends. There is software with a very stable API but security updates. Then, I want the latest version without having to say so explicitly.
  • @TorstenBronger Regarding using latest, dont do it. Latest will pull the, well, more recently image with the latest tag. What you want is a SemVer range. ~1.2.3 for example. this will pull images with tags between the range of >= 1.2.3 and < 1.3.0. As long as the image vendor follows SemVer your know (and this is the important part) no backwards breaking change were added (on purpose) and that no new features were added (possible security concern). Please, please never use latest in production systems.
  • You say kubernetes will pull on Pod creation when using :latest - what about patching? does it also always pull the newest/latest image? Seems not to work for me :(
  • It depends if your patch forces the re-creation of a Pod or not. Most likely not, then it'll not pull again. You may kill the Pod manually, or tag with something unique and patch with that updated tag.
  • This is an answer to a different question. I asked for forcing a re-pull.
  • This allowed me to force a new pull from GCR. I had a :latest tag which pointed at a new image, and the kubectl rolling-update worked to update the pods.
  • Thanks. Went for the Pull & Push approach. Automated as much of it as possible with bash scripts but agreed, it's heavy :)
  • imagePullPolicy (or tagging :latest) is good if you want to always pull, but doesn't solve the question of pulling on demande.
  • Yes, I want to always pull, as stated in the question.