Kubernetes Redis Deployment-need help

I am trying what all you said , thanks for your support and quick reply

What is the name of master node?
To see do “kubectl get nodes”

kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 6h13m v1.16.0
node01 Ready 6h12m v1.16.0

Add also this to schedule on master, “nodeName: master-name” whatever it is, Under the Pod spec in your deployment manifest file.

spec:
  nodeName: master-name

To validate , Deployment Pods deployed on master node or somewhere run the following command: -
kubectl get pods -owide

Collect all the data and give it a try again. If any issue let me know.

You have to write under pod template not deployment.

ok , thank you so much for all your guidance

Welcome… :+1:

@Tej-Singh-Rana We are writing here deployment template only right?

How to write POD template inside deployment?

Below is my redis-deployment-yml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
spec:
  selector:
    matchLabels:
      app: redis
      role: master
      nodename: master
  replicas: 1
  template:
    metadata:
      labels:
        app: redis
        role: master
    spec:
      containers:
      - name: redis-container   
        image: redis:alpine
        resources:
          requests:
            cpu: 1
        ports:
        - containerPort: 6379
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
        - mountPath: /redis-master
          name: config
      volumes:
      - name: data
        emptyDir: {}
      - name: config
        configMap:
          name: redis-config
          items:
          - key: redis-config
            path: redis.conf

Can you please tell me, how to tell this deployment to run on Master node?

Hello, balu.networks7
You need to define nodeName field as you did but in the wrong place. nodeName field comes under the template.spec.
You volumes configMap not looks good. You need to define only configmap name.

@Tej-Singh-Rana Thanks for your immediate response.

Now I tried with below template:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
spec:
  nodename: master
  selector:
    matchLabels:
      app: redis
      role: master
  replicas: 1
  template:
    metadata:
      labels:
        app: redis
        role: master
    spec:
      containers:
      - name: redis-container   
        image: redis:alpine
        resources:
          requests:
            cpu: 1
        ports:
        - containerPort: 6379
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
        - mountPath: /redis-master
          name: config
      volumes:
      - name: data
        emptyDir: {}
      - name: config
        configMap:
          name: redis-config

I am getting below error:

[email protected]_host /$  kubectl create configmap redis-config --from-literal=maxmemory=2mb
configmap/redis-config created
[email protected]_host /$ kubectl apply -f redis-deployment.ymlerror: error validating "redis-deployment.yml": error validating data: ValidationError(Deployment.spec): unknown field "nodename" in io.k8s.api.apps.v1.DeploymentSpec; if you choose to ignore these errors, turn validation off with --validate=false
[email protected]_host /$

Can you please give some idea to fix this.

I am seeing everywhere its mentioned that, node name should come under POD template, like:

apiVersion: v1
kind: Pod
spec:
  nodeName: <value>

How to mention this under Deployment template?

I think i wrote template then spec that means under pod spec.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment

spec:
   < deployment specification field>

  replicas: 1
  template:
    metadata:
      labels:

    spec:
      <pod specification fields>


under template whatever you will add counted in the pod spec.

Define tolerations also. I have seen most of errors for tolerations.
Tolerations link

Sure Thanks @Tej-Singh-Rana

And also In question its mentioned that:

It should mount exactly 2 volumes

How to specify this in our manifest file?

You already did under the volumes section. Need a minor changes in the configMap volume.