Service types, kube-proxy, DNS, Ingress, NetworkPolicy, CNI plugins and Gateway API.
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- What is a Kubernetes Service?
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An abstraction that exposes a set of pods as a network service- What are the four main Kubernetes Service types?
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ClusterIP, NodePort, LoadBalancer, ExternalName- What does a ClusterIP Service do?
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Exposes the Service on an internal IP address, accessible only within the cluster- What does a NodePort Service do?
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Exposes the Service on each node at a static port, making it accessible externally- What does a LoadBalancer Service do?
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Provisions an external load balancer from the cloud provider and routes traffic to the Service- What does an ExternalName Service do?
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Maps a Service to an external DNS name without a selector- What is kube-proxy?
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A network proxy daemon running on each node that implements service abstractions- How does kube-proxy in iptables mode work?
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Uses Linux iptables rules to route traffic to pod endpoints- How does kube-proxy in IPVS mode work?
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Uses Linux Virtual Server for load balancing with better performance than iptables- What is CoreDNS in Kubernetes?
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The default DNS server that provides service discovery by resolving service names to cluster IPs- What is the fully qualified DNS name format for a Kubernetes Service?
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<service-name>.<namespace>.svc.cluster.local- What is a headless Service in Kubernetes?
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A Service with no cluster IP, returning individual pod IPs when queried by DNS- What is an Ingress in Kubernetes?
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An API object that manages external access to services, typically HTTP and HTTPS- What does an Ingress controller do?
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Watches Ingress resources and configures an external load balancer or edge router to route traffic- What is path-based routing in Ingress?
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Routing that directs traffic to different backends based on the URL path
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