Kubernetes Day 10 – Mastering Services: ClusterIP, NodePort & LoadBalancer Explained

Описание: ✅ What are Kubernetes Services? – Learn why services are essential for providing a stable entry point to multiple pods and enabling load balancing.
✅ Types of Kubernetes Services – Understand ClusterIP, NodePort, and LoadBalancer, their scope, and best use cases.
✅ Hands-On Demos – Create and test ClusterIP, NodePort, and LoadBalancer services with practical YAML examples and connectivity testing.
✅ Key Takeaways for Real-World Use – Choose the right service type for internal communication, testing, or production-grade external access.

🚀 Video Chapters 🚀

Understanding Kubernetes Services**
➥ *0:00* – Introduction to Day 10: Kubernetes Services
➥ *0:06* – Recap of Day 9 (Replica Sets)

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Why Services are Needed**
➥ *1:09* – Problem: Multiple pods need a single entry point for users
➥ *1:48* – Solution: Services act as a load balancer and single point of contact

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Types of Kubernetes Services**
➥ *3:13* – Three service types:
1. *ClusterIP* (Internal communication)
2. *NodePort* (Expose service on node-level port)
3. *LoadBalancer* (Cloud-provided external access)

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1. ClusterIP Service**
➥ *3:50* – **ClusterIP Overview**:
Reachable *only within the cluster*
Used for internal communication (e.g., frontend → backend → database)

➥ *7:25* – **Demo**:
Create a ReplicaSet (`ecom.yml`) → deploys 5 pods
Create ClusterIP service (`cip.yml`) → assigns private IP
Test connectivity from a debug pod inside the cluster using `curl ClusterIP:5000`
**Limitation**: No external access

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2. NodePort Service**
➥ *22:14* – **NodePort Overview**:
Exposes service on a *static port* (30000–32767) on each node’s IP
*Not recommended for production* (manual node IP management)


Create NodePort service (`nodeport.yml`) → binds to node IP (e.g., `10.0.0.5:30033`)
Accessible via `NodeIP:NodePort` from within the network
**Traffic flow**: User → NodeIP:Port → Service → Pods

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3. LoadBalancer Service**
➥ *31:58* – **LoadBalancer Overview**:
Cloud-managed (Azure/AWS/GCP)
Automatically assigns *public IP* (or private with annotation)

➥ *33:25* – **Demo**:
Public LoadBalancer (`lb.yml`) → assigns external IP
Accessible globally via `http://PublicIP`
Internal LoadBalancer (`internal-lb.yml`) → assigns private IP
Accessible only within the VNet (annotation: `azure-load-balancer-internal: true`)

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Key Takeaways**
➥ *40:04* – **Summary**:
| Service | Scope | Use Case |
|-------------|-----------------|------------------------------|
| *ClusterIP* | Cluster-internal | Frontend/backend communication |
| *NodePort* | Node-level | Lab/testing |
| *LoadBalancer* | External | Production (public/private) |

➥ *41:45* – Conclusion

✅ 𝗔𝗹𝗹 𝘁𝗵𝗲 𝗰𝗼𝘂𝗿𝘀𝗲 𝗼𝘂𝘁𝗹𝗶𝗻𝗲 𝗵𝗮𝘀 𝗯𝗲𝗲𝗻 𝘂𝗽𝗹𝗼𝗮𝗱𝗲𝗱 𝘁𝗼 𝗺𝘆 𝗚𝗶𝘁𝗵𝘂𝗯 𝗿𝗲𝗽𝗼𝘀𝗶𝘁𝗼𝗿𝘆:
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