K
Q

Deployment Yaml file

5/22/2020

I'm learning SQL Server BDC on minkube using this article as a guide. I tried deploying the below yaml file by running the code : kubectl apply -f deployment.yaml

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: mssql-deployment
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: mssql
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: mssql
        image: microsoft/mssql-server-linux
        ports:
        - containerPort: 1433
          securityContext:
          privileged: true
        env:
        - name: ACCEPT_EULA
          value: "Y"
        - name: SA_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mssql
              key: SA_PASSWORD
      volumeMounts:
      - name: mssqldb
        mountPath: /var/opt/mssql
    volumes:
    - name: mssqldb
      persistentVolumeClaim:
        claimName: pvc0001

It errored due to the v1beta1 APIVersion. I converted this yaml file by running : kubectl convert -f deployment.yaml and got the below script:

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  name: mssql-deployment
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector: null
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: mssql
    spec:
      containers:
      - env:
        - name: ACCEPT_EULA
          value: "Y"
        - name: SA_PASSWORD
          valueFrom:
            secretKeyRef:
              key: SA_PASSWORD
              name: mssql
        image: microsoft/mssql-server-linux
        imagePullPolicy: Always
        name: mssql
        ports:
        - containerPort: 1433
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 10
status: {}

But when I deploy the above script I get:

Error validating "deployment.yaml": error validating data: ValidationError(Deployment.spec): missing required field "selector" in io.k8s.api.apps.v1.DeploymentSpec; if you choose to ignore these errors, turn validation off with --validate=false

It is related to matchlabels/matchexpressions but I'm not able to address it. Can someone point me in the right direction?

-- Gopinath Rajee
deployment
kubernetes
minikube
sql-server-2019
yaml

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2 Answers

5/22/2020

missing required field "selector" in io.k8s.api.apps.v1.DeploymentSpec

You need a selector to select which pods are configured to deployment spec.

solution:

  selector:
    matchLabels:
      app: mssql
  template:
    metadata:
      labels:
        app: mssql
-- RammusXu
Source: StackOverflow
5/22/2020

You need to add a selector in the spec section of the deployment. It's a mandatory field.The .spec.selector field defines how the Deployment finds which Pods to manage. In this case, you simply select a label that is defined in the Pod template (app: mssql). However, more sophisticated selection rules are possible, as long as the Pod template itself satisfies the rule.

apiVersion: apps/v1
kindapiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  name: mssql-deployment
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: mssql
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: mssql
    spec:
      containers:
      - env:
        - name: ACCEPT_EULA
          value: "Y"
        - name: SA_PASSWORD
          valueFrom:
            secretKeyRef:
              key: SA_PASSWORD
              name: mssql
        image: microsoft/mssql-server-linux
        imagePullPolicy: Always
        name: mssql
        ports:
        - containerPort: 1433
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 10
status: {}
-- Arghya Sadhu
Source: StackOverflow