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Kubernetes Pods with YAML

Kubernetes Pods with YAML

Step-01: Kubernetes YAML Top level Objects¶

Discuss about the k8s YAML top level objects
kube-base-definition.yml
```
apiVersion:
kind:
metadata:

spec:
```
Kubernetes Reference
Kubernetes API Reference
Pod API Objects Reference

Step-02: Create Simple Pod Definition using YAML¶

We are going to create a very basic pod definition

01-pod-definition.yml

apiVersion: v1 # String
kind: Pod  # String
metadata: # Dictionary
  name: myapp-pod
  labels: # Dictionary 
    app: myapp         
spec:
  containers: # List
    - name: myapp
      image: stacksimplify/kubenginx:1.0.0
      ports:
        - containerPort: 80

Create Pod

# Change Directory
cd kube-manifests

# Create Pod
kubectl create -f 01-pod-definition.yml
[or]
kubectl apply -f 01-pod-definition.yml

# List Pods
kubectl get pods

Step-03: Create a LoadBalancer Service¶

02-pod-LoadBalancer-service.yml

apiVersion: v1
kind: Service
metadata:
  name: myapp-pod-loadbalancer-service  # Name of the Service
spec:
  type: LoadBalancer
  selector:
  # Loadbalance traffic across Pods matching this label selector
    app: myapp
  # Accept traffic sent to port 80    
  ports: 
    - name: http
      port: 80    # Service Port
      targetPort: 80 # Container Port

Create LoadBalancer Service for Pod

# Create Service
kubectl apply -f 02-pod-LoadBalancer-service.yml

# List Service
kubectl get svc

# Access Application
http://<Load-Balancer-Service-IP>
curl http://<Load-Balancer-Service-IP>

Step-04: Clean-Up Kubernetes Pod and Service¶

# Change Directory
cd kube-manifests

# Delete Pod
kubectl delete -f 01-pod-definition.yml

# Delete Service
kubectl delete -f  02-pod-LoadBalancer-service.yml

API Object References¶