Updating pod definition to define readiness probe on existing kubernetes deployment

Question

I have created a Kubernetes deployment with pods defined by a template. I need to update the pod definition to include readiness and liveliness probes because the template doesn't allow the creation of these probes as far as I can tell. Any ideas?

The problem with the deployment is that it won't let me add in probe definitions. If I use a probe definition like the following:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: <appdeployment>
  labels:
    app: <appname>
spec:
  replicas: 3
  selector:
    matchLabels:
      app: <appname>
  template:
    metadata:
      labels:
        app: <appname>
    spec:
      containers:
      - image: "registry.hub.docker.com/imagename"
        name: <appname>-image
        readinessProbe:
          httpGet:
              path: /healthz
              port: 80
          initialDelaySeconds: 90
          periodSeconds: 5
          failureThreshold: 20
        ports:
        - containerPort: 80
          protocol: TCP
        resources:
          requests:
            cpu: 1000m
          limits:
            cpu: 4000m

It fails with error: error parsing .yaml: error converting YAML to JSON: yaml: line 22: found character that cannot start any token

That line is the definition of the readiness probe.

Arghya Sadhu Arghya Sadhu · Accepted Answer · 2020-04-16T04:29:45

You can use the command kubectl edit deployment deploymentname -n namespacename which will open up an editor where you can edit the yaml to add readiness probe and liveness probe and saving it will directly apply the changes to the cluster.

Alternatively you can use kubectl get deployment deploymentname -n namespacename -o yaml > deployment.yaml to save the deployment in yaml file and edit it to add readiness probe and liveness probe and then kubectl apply -f deployment.yaml to deploy the changes to the cluster.

Updating pod definition to define readiness probe on existing kubernetes deployment

3 Answers