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

Question

I've created Hyper-V machine and tried to deploy Sawtooth on Minikube using Sawtooth YAML file : https://sawtooth.hyperledger.org/docs/core/nightly/master/app_developers_guide/sawtooth-kubernetes-default.yaml

I changed the apiVersion i.e. apiVersion: extensions/v1beta1 to apiVersion: apps/v1, though I have launched Minikube in Kubernetes v1.17.0 using this command

minikube start --kubernetes-version v1.17.0

After that I can't deploy the server. Command is

kubectl apply -f sawtooth-kubernetes-default.yaml --validate=false

It shows an error with "sawtooth-0" is invalid.

---
apiVersion: v1
kind: List

items:

- apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: sawtooth-0
  spec:
    replicas: 1
    selector:
      matchLabels:
        name: sawtooth-0
    template:
      metadata:
        labels:
          name: sawtooth-0
      spec:
        containers:
          - name: sawtooth-devmode-engine
            image: hyperledger/sawtooth-devmode-engine-rust:chime
            command:
              - bash
            args:
              - -c
              - "devmode-engine-rust -C tcp://$HOSTNAME:5050"

          - name: sawtooth-settings-tp
            image: hyperledger/sawtooth-settings-tp:chime
            command:
              - bash
            args:
              - -c
              - "settings-tp -vv -C tcp://$HOSTNAME:4004"

          - name: sawtooth-intkey-tp-python
            image: hyperledger/sawtooth-intkey-tp-python:chime
            command:
              - bash
            args:
              - -c
              - "intkey-tp-python -vv -C tcp://$HOSTNAME:4004"

          - name: sawtooth-xo-tp-python
            image: hyperledger/sawtooth-xo-tp-python:chime
            command:
              - bash
            args:
              - -c
              - "xo-tp-python -vv -C tcp://$HOSTNAME:4004"

          - name: sawtooth-validator
            image: hyperledger/sawtooth-validator:chime
            ports:
              - name: tp
                containerPort: 4004
              - name: consensus
                containerPort: 5050
              - name: validators
                containerPort: 8800
            command:
              - bash
            args:
              - -c
              - "sawadm keygen \
              && sawtooth keygen my_key \
              && sawset genesis -k /root/.sawtooth/keys/my_key.priv \
              && sawset proposal create \
                -k /root/.sawtooth/keys/my_key.priv \
                sawtooth.consensus.algorithm.name=Devmode \
                sawtooth.consensus.algorithm.version=0.1 \
                -o config.batch \
              && sawadm genesis config-genesis.batch config.batch \
              && sawtooth-validator -vv \
                  --endpoint tcp://$SAWTOOTH_0_SERVICE_HOST:8800 \
                  --bind component:tcp://eth0:4004 \
                  --bind consensus:tcp://eth0:5050 \
                  --bind network:tcp://eth0:8800"

          - name: sawtooth-rest-api
            image: hyperledger/sawtooth-rest-api:chime
            ports:
              - name: api
                containerPort: 8008
            command:
              - bash
            args:
              - -c
              - "sawtooth-rest-api -C tcp://$HOSTNAME:4004"

          - name: sawtooth-shell
            image: hyperledger/sawtooth-shell:chime
            command:
              - bash
            args:
              - -c
              - "sawtooth keygen && tail -f /dev/null"

- apiVersion: apps/v1
  kind: Service
  metadata:
    name: sawtooth-0
  spec:
    type: ClusterIP
    selector:
      name: sawtooth-0
    ports:
      - name: "4004"
        protocol: TCP
        port: 4004
        targetPort: 4004
      - name: "5050"
        protocol: TCP
        port: 5050
        targetPort: 5050
      - name: "8008"
        protocol: TCP
        port: 8008
        targetPort: 8008
      - name: "8800"
        protocol: TCP
        port: 8800
        targetPort: 8800

Answer 1

You need to fix your deployment yaml file. As you can see from your error message, the Deployment.spec.selector field can't be empty.

Update the yaml (i.e. add spec.selector) as shown in below:

  spec:
    replicas: 1
    selector:
      matchLabels:
        app.kubernetes.io/name: sawtooth-0
    template:
      metadata:
        labels:
          app.kubernetes.io/name: sawtooth-0

• Why selector field is important?

The 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.kubernetes.io/name: sawtooth-0). However, more sophisticated selection rules are possible, as long as the Pod template itself satisfies the rule.

• Reference

Update:

The apiVersion for k8s service is v1:

- apiVersion: v1 # Update here
  kind: Service
  metadata:
    app.kubernetes.io/name: sawtooth-0
  spec:
    type: ClusterIP
    selector:
      app.kubernetes.io/name: sawtooth-0
    ... ... ...

Answer 2

For api version v1 (and also for apps/v1) you need to use app: <your lable>

apiVersion: v1
kind: Service
metadata:
  name: sawtooth-0
spec:
  selector:
    app: sawtooth-0

See : https://kubernetes.io/docs/concepts/services-networking/service/

Answer 3

The answer for this is already covered by @Kamol

---

Some general possible reasons if you are still getting the error :

missing required field “XXX” in YYY

1. Check apiVersion at the top of file (for Deployment, version is: apps/v1 & for service it's v1
2. Check the spelling of "XXX"(unknown field) and check if syntax is incorrect.
3. Check kind: ... once again.

If you find some other reason, please comment and let other's know :)