> ## Documentation Index > Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Demo Deploy voting app on Kubernetes with Deployments > This article demonstrates how to deploy a voting app on Kubernetes using Deployments for automated management and scaling. Managing individual Pods poses challenges such as manual scaling and downtime during updates. Kubernetes **Deployments** resolve these by automating ReplicaSet management, rolling updates, and rollbacks. Deployments provide declarative updates, automatic rollbacks, and easy scaling.\ Learn more: [Kubernetes Deployments](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/). ## Voting App Architecture ![The image is a diagram of an example voting app architecture using Kubernetes, showing multiple pods for voting and result apps, along with Redis and database services. It illustrates the deployment and service connections between these components.](https://kodekloud.com/kk-media/image/upload/v1752873979/notes-assets/images/Docker-Certified-Associate-Exam-Course-Demo-Deploy-voting-app-on-Kubernetes-with-Deployments/voting-app-architecture-kubernetes-diagram.jpg) ## 1. Define Deployment Manifests Below is a summary of all Deployment YAML files: | Manifest File | Component | Image | | ---------------------- | ---------------- | -------------------------------------- | | voting-app-deploy.yaml | Voting Frontend | `kodekloud/examplevotingapp_vote:v1` | | redis-deploy.yaml | Redis Cache | `redis` | | postgres-deploy.yaml | PostgreSQL DB | `postgres` | | worker-app-deploy.yaml | Background Work | `kodekloud/examplevotingapp_worker:v1` | | result-app-deploy.yaml | Results Frontend | `kodekloud/examplevotingapp_result:v1` | ### voting-app-deploy.yaml ```yaml theme={null} apiVersion: apps/v1 kind: Deployment metadata: name: voting-app-deploy labels: app: demo-voting-app component: voting spec: replicas: 1 selector: matchLabels: app: demo-voting-app component: voting template: metadata: labels: app: demo-voting-app component: voting spec: containers: - name: voting-app image: kodekloud/examplevotingapp_vote:v1 ports: - containerPort: 80 ``` ### redis-deploy.yaml ```yaml theme={null} apiVersion: apps/v1 kind: Deployment metadata: name: redis-deploy labels: app: demo-voting-app component: redis spec: replicas: 1 selector: matchLabels: app: demo-voting-app component: redis template: metadata: labels: app: demo-voting-app component: redis spec: containers: - name: redis image: redis ports: - containerPort: 6379 ``` ### postgres-deploy.yaml ```yaml theme={null} apiVersion: apps/v1 kind: Deployment metadata: name: postgres-deploy labels: app: demo-voting-app component: postgres spec: replicas: 1 selector: matchLabels: app: demo-voting-app component: postgres template: metadata: labels: app: demo-voting-app component: postgres spec: containers: - name: postgres image: postgres ports: - containerPort: 5432 env: - name: POSTGRES_USER value: "postgres" - name: POSTGRES_PASSWORD value: "postgres" ``` ### worker-app-deploy.yaml ```yaml theme={null} apiVersion: apps/v1 kind: Deployment metadata: name: worker-app-deploy labels: app: demo-voting-app component: worker spec: replicas: 1 selector: matchLabels: app: demo-voting-app component: worker template: metadata: labels: app: demo-voting-app component: worker spec: containers: - name: worker-app image: kodekloud/examplevotingapp_worker:v1 ``` ### result-app-deploy.yaml ```yaml theme={null} apiVersion: apps/v1 kind: Deployment metadata: name: result-app-deploy labels: app: demo-voting-app component: result spec: replicas: 1 selector: matchLabels: app: demo-voting-app component: result template: metadata: labels: app: demo-voting-app component: result spec: containers: - name: result-app image: kodekloud/examplevotingapp_result:v1 ports: - containerPort: 80 ``` ## 2. Apply Deployments and Services First, ensure no leftover Pods or Services: ```bash theme={null} kubectl get pods,svc # No resources found ``` Create each Deployment and its Service: ```bash theme={null} kubectl apply -f voting-app-deploy.yaml kubectl apply -f voting-app-service.yaml kubectl apply -f redis-deploy.yaml kubectl apply -f redis-service.yaml kubectl apply -f postgres-deploy.yaml kubectl apply -f postgres-service.yaml kubectl apply -f worker-app-deploy.yaml kubectl apply -f result-app-deploy.yaml kubectl apply -f result-app-service.yaml ``` ## 3. Verify Deployments and Services Check Deployments and Pods: ```bash theme={null} kubectl get deployments kubectl get pods ``` Confirm Services: ```bash theme={null} kubectl get svc ``` | SERVICE | TYPE | CLUSTER-IP | PORT(S) | | -------------- | --------- | ---------- | ------------ | | voting-service | NodePort | 10.100.x.y | 80:30004/TCP | | result-service | NodePort | 10.105.x.z | 80:30005/TCP | | redis | ClusterIP | 10.104.x.y | 6379/TCP | | db | ClusterIP | 10.107.x.z | 5432/TCP | ## 4. Access Front-end Services Retrieve and open URLs: ```bash theme={null} minikube service voting-service --url minikube service result-service --url ``` Visit the voting app, cast a vote, then check the result app to verify it’s recorded. ## 5. Scale the Front-end Scaling with Deployments is straightforward. Increase replicas for the voting app: ```bash theme={null} kubectl scale deployment voting-app-deploy --replicas=3 ``` Verify three Pods are Running: ```bash theme={null} kubectl get pods -l component=voting ``` Refresh the voting URL to observe traffic served by multiple replicas—no downtime required! *** ## Links and References * [Kubernetes Deployments](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/) * [kubectl Cheat Sheet](https://kubernetes.io/docs/reference/kubectl/cheatsheet/) * [Minikube Service Command](https://minikube.sigs.k8s.io/docs/commands/service/)