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Kubernetes Manifest Yaml files

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Manupuri Nithin
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Kubernetes is an orchestration-platform, which is to manage containers.

When working with Kubernetes (K8s), you can interact with it using two primary modes: imperative mode and declarative mode.

imperative mode means to run the commands, declarative mode k8s manifest yaml files.

1.To create a Pod:

apiVersion: v1
kind: Pod
metadata: 
  name: your_app_name
  labels:
   name: your_app_name_pod
spec:
 containers:
  - name: your_contaianer_name
    image: docker_image_name
    ports:
     - containerPort: 8080

2.Service: Is to Expose your application outside the cluster.To expose outside the cluster then we have three type that are ClusterIP,NodePort,Load Balancer.

ClusterIP is one of the service types used to expose applications within the cluster. When you create a Service of type ClusterIP, Kubernetes assigns a stable virtual IP address (ClusterIP) to the Service. This IP address is accessible only within the cluster and is not exposed externally.

Node Port: we can expose outside the cluster

apiVersion: v1
kind: Service
metadata:
  name: your_app_name
  labels:
    name: your_app_name_svc
spec:
  selector:
    app: your_app_name  # Select pods with the 'app' label set to 'your_app_name
  type: NodePort  # Exposes the service on a random port (NodePort) on all nodes in the cluster
  ports:   
    - protocol: TCP
      port: 80  # Port on the service through which it will be accessed
      targetPort: 9090  # Port on the pods to forward traffic to
      nodePort: 30002  # Port on the host (NodePort) through which the service will be accessible externally

3.ReplicationController

It creates replicas so that when a depodgrades or fails it will take care of createing pods

apiVersion: app/V1
kind: ReplicationController
metadata:
 name: my_app_name
spec: 
  replicas: 4 #enter the number to maintain the replicas
  selector:
    app: my_app_rc
  templates:
    metadata: 
      labels:
        app: my_app_rc
    spec: 
      containers:
       - name: my_ontainer_name
         image: image-name
         ports: 
           - containerPort: 9000

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Kubernetes