January 2019
Intermediate to advanced
484 pages
11h 48m
English
Content preview from DevOps with Kubernetes - Second Edition
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External-to-service communications
The ability to serve external traffic to Kubernetes is critical. Kubernetes provides two API objects to achieve this:
- Service: External network LoadBalancer or NodePort (L4)
- Ingress: HTTP(S) LoadBalancer (L7)
We'll learn more about ingress in the next section. For now, we'll focus on the L4 service. Based on what we've learned about pod-to-pod communication across nodes, the packet goes in and out between the service and pod. The following diagram is an illustration of this process. Let's say we have two services: service A has three pods (pod a, pod b, and pod c) and service B gets only one pod (pod d). When the traffic comes in from the LoadBalancer, the packet will be dispatched to one of the nodes. ...
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