Kubectl apply does not update pods or deployments

Question

I'm using a CI to update my kubernetes cluster whenever there's an update to an image. Whenever the image is pushed and has the latest tag it kubectl apply's the existing deployment but nothing gets updated.

this is what runs $ kubectl apply --record --filename /tmp/deployment.yaml

My goal is when the apply is ran that a rolling deployment gets executed.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
    name: api
spec:
    replicas: 1
    template:
    metadata:
        labels:
        app: api
    spec:
        containers:
        - name: api
        image: us.gcr.io/joule-eed41/api:latest
        imagePullPolicy: Always
        ports:
            - containerPort: 1337
        args:
            - /bin/sh
            - -c
            - echo running api;npm start
        env:        
        - name: NAMESPACE
            valueFrom:
            configMapKeyRef:
                name: config
                key: NAMESPACE

the issue is that k8s doesn't know that actual image tagged changed. you have 2 solutions: 1) remove existing pods, then new version will be pulled 2) use new version each time. — uthark
@HannanRhodes your docker image should be published under strict version, not floating latest. e.g. 0.1, 0.2, 0.3, etc. — uthark

ksholla20 ksholla20 · Accepted Answer · 2017-11-05T04:29:41

As others suggested, have a specific tag. Set new image using following command

kubectl set image deployment/deployment_name deployment_name=image_name:image_tag

In your case it would be

kubectl set image deployment/api api=us.gcr.io/joule-eed41/api:0.1

Kubectl apply does not update pods or deployments

2 Answers