Error while trying to create ReplicaSet on Kubernetes with YAML - kubernetes

Question

I'm a beginner with Kubernetes and YAML.
I've been trying to deploy a ReplicaSet with YAML.
This is the file for the ReplicaSet:
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: myapp-replicaset
label:
app: myapp
spec:
selector:
matchlabels:
env: production
name: nginx
replicas: 3
template:
metadata:
name: nginx
labels:
env: production
name: nginx
spec:
containers:
- name: nginx
image: nginx
resources:
limits:
memory: "128Mi"
cpu: "500m"
ports:
- containerPort: 80
And this is the Pod file:
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
env: production
name: nginx
spec:
containers:
- name: nginx
image: nginx
resources:
limits:
memory: "128Mi"
cpu: "500m"
ports:
- containerPort: 80
However, when I execute the kubectl create -f replicaset.yml command, I get the following error:
The ReplicaSet "myapp-replicaset" is invalid:
spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string(nil), MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: empty selector is invalid for deployment
spec.template.spec.containers: Required value

Answer 1

Your replicaset.yaml indentation seems to be wrong + with some typos.
replicas & template should be inside the spec level. Also, check the marked & corrected typos in labels & matchLabels.
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: myapp-replicaset
labels: # labels
app: myapp
spec:
selector:
matchLabels: # matchLabels
env: production
name: nginx
replicas: 3
template:
metadata:
name: nginx
labels:
env: production
name: nginx
spec:
containers:
- name: nginx
image: nginx
resources:
limits:
memory: "128Mi"
cpu: "500m"
ports:
- containerPort: 80