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k8s-api-tutorial

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Simple Walkthrough of Kubernetes API

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# Kubernetes API Walkthrough
Simple walkthrough of Kubernetes API

You can also execute the [shell script](https://github.com/janakiramm/k8s-api-tutorial/blob/master/k8s-api.sh) to perform these steps.

Install [JQ](https://stedolan.github.io/jq/) before trying the commands.
Make sure that you have access to a Kubernetes cluster.

## Verify Kubernetes setup
```
kubectl cluster-info
kubectl component-status
```
## Configure the proxy
```
kubectl proxy --port=8000&
```
## Open the Swagger UI in the browser 
```
open http://localhost:8000/swagger-ui/
```
## Invoke simple Kubernetes API
```
curl http://localhost:8000/api
```
## cURL command equivalent to 'kubectl get nodes'
```
curl -s http://localhost:8000/api/v1/nodes | jq '.items[] .metadata.labels'
```

## Create a Nginx Pod definition
```
cat > nginx-pod.json <<EOF
{
    "kind": "Pod",
    "apiVersion": "v1",
    "metadata":{
        "name": "nginx",
        "namespace": "default",
        "labels": {
            "name": "nginx"
        }
    },
    "spec": {
        "containers": [{
            "name": "nginx",
            "image": "nginx",
            "ports": [{"containerPort": 80}],
            "resources": {
                "limits": {
                    "memory": "128Mi",
                    "cpu": "500m"
                }
            }
        }]
    }
}
EOF
```
## Create a Service definition to expose Nginx Pod
```
cat > nginx-service.json <<EOF
{
    "kind": "Service",
    "apiVersion": "v1",
    "metadata": {
        "name": "nginx-service",
        "namespace": "default",
        "labels": {"name": "nginx"}
    },
    "spec": {
        "ports": [{"port": 80}],
        "selector": {"name": "nginx"}
    }
}
EOF
```
# Create the Pod object
```
curl -s http://localhost:8000/api/v1/namespaces/default/pods \
-XPOST -H 'Content-Type: application/json' \
-d@nginx-pod.json \
| jq '.status'
```

# Create the Service object
```
curl -s http://localhost:8000/api/v1/namespaces/default/services \
-XPOST -H 'Content-Type: application/json' \
-d@nginx-service.json \
| jq '.spec.clusterIP'
```

## Verify the Pod with 'kubectl get pods'
```
kubectl get pods
```
## Verify the Service with 'kubectl get svc'
```
kubectl get svc
```
## Access Nginx default page through the proxy
```
curl http://localhost:8000/v1/proxy/namespaces/default/services/nginx-service/
```
## Delete the Pod
```
curl http://localhost:8000/api/v1/namespaces/default/services/nginx-service -XDELETE
```
## Delete the Service
```
curl http://localhost:8000/api/v1/namespaces/default/pods/nginx -XDELETE
```

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