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https://github.com/kro-run/kro

install kro

export KRO_VERSION=$(curl -sL \
    https://api.github.com/repos/kro-run/kro/releases/latest | \
    jq -r '.tag_name | ltrimstr("v")'
  )
echo "KRO_VERSION: $KRO_VERSION" 

helm install kro oci://ghcr.io/kro-run/kro/kro \
  --namespace kro \
  --create-namespace \
  --version=${KRO_VERSION}

 helm -n kro list 
 

NAME	NAMESPACE	REVISION	UPDATED                                	STATUS  	CHART    	APP VERSION
kro 	kro      	1       	2025-05-11 18:06:30.464559329 +0000 UTC	deployed	kro-0.2.3	0.2.3      


kubectl get pods -n kro

NAME                   READY   STATUS    RESTARTS   AGE
kro-86d5b5b5bd-jlqfr   1/1     Running   0          54s

create RGD

# vim RGD.yaml
apiVersion: kro.run/v1alpha1
kind: ResourceGraphDefinition
metadata:
  name: pingpongapp
spec:
  schema:
    apiVersion: v1alpha1
    kind: PingPongApp
    spec:
      namespace: string  | default="app"
      replicas:  integer | default=1
      image:     string  | required=true
      tag:       string  | default="latest"
      port:      integer | default=8080
      host:      string  | default="cka.local"

  resources:
    - id: ns
      template:
        apiVersion: v1
        kind: Namespace
        metadata:
          name: ${schema.spec.namespace}

    - id: deployment
      template:
        apiVersion: apps/v1
        kind: Deployment
        metadata:
          namespace: ${schema.spec.namespace}
          name:      ${schema.metadata.name}
        spec:
          replicas: ${schema.spec.replicas}
          selector:
            matchLabels:
              app: ${schema.metadata.name}
          template:
            metadata:
              labels:
                app: ${schema.metadata.name}
            spec:
              containers:
                - name:  ${schema.metadata.name}
                  image: ${schema.spec.image}:${schema.spec.tag}

    - id: service
      template:
        apiVersion: v1
        kind: Service
        metadata:
          namespace: ${schema.spec.namespace}
          name:      ${schema.metadata.name}
        spec:
          selector:
            app: ${schema.metadata.name}
          ports:
            - port:       ${schema.spec.port}
              targetPort: ${schema.spec.port}

    - id: ingress
      template:
        apiVersion: networking.k8s.io/v1
        kind: Ingress
        metadata:
          namespace: ${schema.spec.namespace}
          name:      ${schema.metadata.name}-ingress
        spec:
          rules:
            - host: ${schema.spec.host}
              http:
                paths:
                  - path:     "/"
                    pathType: Prefix
                    backend:
                      service:
                        name: ${schema.metadata.name}
                        port:
                          number: ${schema.spec.port}



k apply -f RGD.yaml
k get crd  pingpongapps.kro.run 

NAME                   CREATED AT
pingpongapps.kro.run   2025-05-20T17:17:32Z

create resouses

# vim  resouses.yaml 
 
apiVersion: kro.run/v1alpha1   
kind: PingPongApp
metadata:
  name: app-prod
spec:
  namespace: app
  replicas: 2
  image:     viktoruj/ping_pong
  tag:       latest
  port:      8080
  host:      cka.local


k apply -f resouses.yaml

check resources

k get all -n app

k get po,deployment,svc,ing -n app


NAME                            READY   STATUS    RESTARTS   AGE
pod/app-prod-7b7749b69b-65xgv   1/1     Running   0          55s
pod/app-prod-7b7749b69b-tgrwb   1/1     Running   0          55s

NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/app-prod   2/2     2            2           55s

NAME               TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)    AGE
service/app-prod   ClusterIP   10.99.202.9   <none>        8080/TCP   52s

NAME                                         CLASS    HOSTS       ADDRESS   PORTS   AGE
ingress.networking.k8s.io/app-prod-ingress   <none>   cka.local             80      49s

check ingress

# curl cka.local:30102

Server Name: ping_pong_server
URL: http://cka.local:30102/
Client IP: 10.0.221.132
Method: GET
Protocol: HTTP/1.1
responseDelay: 0
maxResponseWorker: 65535
ResponseWorker: 1
additionalResponseSize: 0 Kb 
--------------- 
 
Headers:
 
X-Request-Id: abd0c90a66faccc7f4367d7880af23f3
X-Forwarded-Port: 80
X-Forwarded-Proto: http
X-Scheme: http
User-Agent: curl/7.81.0
X-Real-Ip: 10.10.2.73
X-Forwarded-For: 10.10.2.73
X-Forwarded-Host: cka.local:30102
X-Forwarded-Scheme: http
Accept: */*
--------------- 
 
Headers size : 
 
X-Real-Ip:  10 byte  
X-Forwarded-For:  10 byte  
X-Forwarded-Host:  15 byte  
X-Forwarded-Scheme:  4 byte  
Accept:  3 byte  
X-Request-Id:  32 byte  
X-Forwarded-Port:  2 byte  
X-Forwarded-Proto:  4 byte  
X-Scheme:  4 byte  
User-Agent:  11 byte  
--------------- 
total size of headers: 95 byte  
--------------- 
total request size  : 113 byte

add more replicas

# k edit pingpongapps.kro.run  app-prod
........
spec:
  host: cka.local
  image: viktoruj/ping_pong
  namespace: app
  port: 8080
  replicas: 3                           # update it
  tag: latest

........

check pods

# k get pods -n app
NAME                        READY   STATUS    RESTARTS   AGE
app-prod-7b7749b69b-26wrg   1/1     Running   0          6s
app-prod-7b7749b69b-dqsvq   1/1     Running   0          5m
app-prod-7b7749b69b-ljbrc   1/1     Running   0          5m

delete resources

k delete pingpongapps.kro.run  app-prod

# k get ns app
Error from server (NotFound): namespaces "app" not found