🚀 Deployment in Kubernetes

🔹 Why Do We Need Deployment in Kubernetes? ⇒

• The Replication Controller and ReplicaSet are great for ensuring that the correct number of pod replicas are running at all times.
• However, they lack the capability to update applications dynamically or roll back to a previous stable version in case of failures.
• This is where the Deployment object in Kubernetes comes into play.

🔹 What is a Deployment? ⇒

A Deployment in Kubernetes acts as a supervisor for pods, allowing you to:

✔️ Roll out a new version of an application.

✔️ Scale the application up or down based on demand.

✔️ Update applications with zero downtime.

✔️ Rollback to a previous stable version if something goes wrong.

🔹 How Deployments Work in Kubernetes? ⇒

1️⃣ You define the desired state of an application in a Deployment configuration (YAML file).

2️⃣ The Kubernetes Deployment Controller schedules the application on suitable nodes.

3️⃣ If a node fails or a pod crashes, Kubernetes automatically replaces it.

4️⃣ The system continuously monitors the application and ensures it runs as expected.

5️⃣ Kubernetes supports rolling updates and rollbacks to ensure application stability.