𝐒𝐭𝐚𝐭𝐞 𝐀𝐠𝐧𝐨𝐬𝐭𝐢𝐜𝐢𝐬𝐦 :

Deployments are primarily used for stateless applications. While they can maintain the state via Persistent Volumes, they aren’t designed to provide the guarantees of identity and ordering that StatefulSets do.

2. 𝐑𝐞𝐩𝐥𝐢𝐜𝐚 𝐇𝐚𝐧𝐝𝐥𝐢𝐧𝐠:

Deployments ensure a specified number of pod replicas are maintained. If a pod goes down, Deployments will create a new one, but without any specific identity (unlike the ordinal naming in StatefulSets).

3. 𝐑𝐨𝐥𝐥𝐢𝐧𝐠 𝐔𝐩𝐝𝐚𝐭𝐞𝐬 & 𝐑𝐨𝐥𝐥𝐛𝐚𝐜𝐤𝐬:

Deployments excel in providing rolling updates. If you deploy a new version of your app, Deployments will gradually replace old pods with new ones. If something goes wrong, it’s easy to rollback to a previous version.

4. 𝐔𝐬𝐞 𝐂𝐚𝐬𝐞 𝐰𝐢𝐭𝐡 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬:

Deployments can be used for databases, but typically for stateless parts of the system or where the data can be easily replicated, and the unique identity of pods isn’t critical.