使用Deployment管理無(wú)狀態(tài)應(yīng)用，使用StatefulSet管理有狀態(tài)應(yīng)用。 1. Deployment適用於無(wú)需穩(wěn)定身份或持久化數(shù)據(jù)的應(yīng)用，支持滾動(dòng)更新和回滾，Pod名稱(chēng)隨機(jī)生成且可互換；2. StatefulSet適用於需要唯一身份和持久化存儲(chǔ)的應(yīng)用，如數(shù)據(jù)庫(kù)集群，Pod按順序命名且更新有序進(jìn)行。

In Kubernetes, Deployments and StatefulSets both manage groups of identical pods, but they serve different use cases — especially when it comes to state and identity.

When to Use a Deployment

A Deployment is ideal for managing stateless applications , where individual pod instances don't need a stable identity or persistent data. It ensures that a specified number of pod replicas are running at any given time and supports rolling updates and rollbacks.

• You can scale the number of pods easily.
• Pod names are randomly generated (like myapp-pod-6df8597494-2xgkl ).
• Pods are interchangeable; losing one doesn't affect the system as long as another takes its place.

Use Deployments if:

• Your app doesn't rely on specific pod identities
• You don't need persistent storage tied to a particular pod
• You want easy rollout/rollback mechanisms

When to Use a StatefulSet

A StatefulSet is designed for stateful applications , where each pod has a unique identity and might need persistent storage. For example, databases like MySQL clusters or ZooKeeper nodes often require predictable hostnames and stable network IDs.

• Pod names follow an ordered naming convention (like my-stateful-pod-0 , my-stateful-pod-1 )
• Each pod can be associated with its own PersistentVolume
• Updates happen in sequence rather than all at once

Use StatefulSets if:

• Your app needs stable, unique network identifiers
• You're using persistent data that must stay with a specific instance
• You require ordered deployment, scaling, or deletion

Key Differences at a Glance

So, basically:

• Use a Deployment when your pods don't need identity or dedicated storage.
• Go with a StatefulSet when you need pods with persistent identity and/or storage.

It's not complicated, but choosing the right one matters depending on your application's needs.

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