Kubernetes – Deployments

A Deployment provides declarative updates for Pods and ReplicaSets.

Deployments | Kubernetes

Creating a deployment

(Example) A simple deployment of 2 nginx pods

• Create a YAML file

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
  labels:
    app: my-nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: my-nginx
    template:
      metadata:
        labels:
          app: my-nginx
      spec:
        containers:
        - name: my-nginx
          image: nginx:latest
          ports:
          - containerPort: 80

• Create/Apply

kubectl create -f <yaml-file>

# Use --save-config when you want to use 'kubectl apply' in the future
kubectl create -f <yaml-file> --save-config

kubectl apply -f <yaml-file>

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Checking deployments

kubectl get deployments

kubectl describe deployment <deployment-name>

Checking replica sets

kubectl get replicasets

kubectl describe replicaset <replicaset-name>