KUBERNETES REPLICASET Secrets You Need to Know NOW
Автор: Learning Curve
Загружено: 2025-12-06
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What is a ReplicaSet & Scaling - KUBERNETES Day 3 Part II
🔑 What is a ReplicaSet?
A ReplicaSet ensures that a specified number of identical Pods are running at any given time.
It acts as a controller that monitors Pods and automatically creates or deletes them to maintain the desired state.
Successor to the older ReplicationController, but with more advanced features like set-based selectors.
⚙️ How ReplicaSets Work
You define a Pod template and a replica count in the ReplicaSet manifest.
Kubernetes continuously checks the cluster state:
If Pods crash or nodes fail → ReplicaSet spins up replacements.
If extra Pods exist → ReplicaSet removes them.
This ensures high availability and fault tolerance.
📈 Scaling Applications
ReplicaSets are central to scaling workloads:
Manual Scaling: Update the replicas field in the YAML definition.
Horizontal Pod Autoscaler (HPA): Automates scaling based on CPU/memory usage or custom metrics.
Deployments: Typically used on top of ReplicaSets to manage rolling updates, rollbacks, and scaling strategies.
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