How deeply does Google Anthos in Action cover clusterip service type?

Defines addressing and reachability, then compares two resolution mechanisms without detailing their implementation.

Clusterip service type

A ClusterIP is a stable, cluster-internal virtual IP address assigned to a Kubernetes Service.

A ClusterIP is a stable virtual IP for a Kubernetes Service inside a cluster. It balances traffic across the Service’s Pods, whose individual IP addresses can change when they move between nodes. ClusterIPs are not reachable from outside the cluster. section 10.2.1

Declare an internal Service

For a guestbook frontend, set `spec.type: ClusterIP`, select Pods labeled `app: guestbook`, and expose port 80. Other services in the cluster can use its ClusterIP. section 10.2.1

Table 10.1

Network feature	Existing	New Dataplane
ClusterIP service resolution	kube-proxy using iptables	`cilium-agent` using eBPF on sockets
NodePort service resolution	kube-proxy using iptables	`cilium-agent` using eBPF on eth0 TC hooks
Load balancer service resolution	kube-proxy using iptables redirecting to service chain	`cilium-agent` using eBPF on eth0 TC hooks (same hook as previously)
Network policy enforcement	Calico using iptables	`cilium-agent` using eBPF on socket as well as eth0 TC hooks

Compare how the existing and new data planes resolve ClusterIP Services: kube-proxy uses iptables; cilium-agent uses eBPF on sockets. section 10.2.1

How Google Anthos in Action covers it

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Also explained in

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Road to KubernetesA ClusterIP Service is a Kubernetes Service type that provides an internal cluster-only endpoint and balances traffic across selected Pods.
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Kubernetes in Action, Second EditionA ClusterIP service is a Kubernetes Service that provides an internal cluster IP address for reaching a set of pods.
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Machine Learning Platform EngineeringA ClusterIP service is a Kubernetes service that provides an internal cluster-scoped IP address for accessing selected pods.
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Acing the Certified Kubernetes Administrator Exam, Second EditionA ClusterIP is a Kubernetes service type that exposes a service through an internal cluster IP address.
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Kubernetes for DevelopersClusterIP is a Kubernetes Service type that assigns a cluster-internal IP address for access from within the cluster.

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Related concepts

servicekind of · A Kubernetes Service is an API resource that provides stable network access and service discovery for a changing set of Pods or other specified destinations.
internal serviceused by · An internal service is a Kubernetes Service addressed through a private cluster IP for communication among workloads inside the cluster.
headless serviceconfigures · A headless Service is a Kubernetes Service without a cluster IP that exposes its backing pod addresses directly through DNS.
loadbalancer servicealternative to · A Kubernetes LoadBalancer Service is a Service type that exposes workloads externally through a provisioned or integrated network load balancer.
node portcontrasts with · NodePort is a Kubernetes Service type that exposes a service through a designated port on every cluster node and routes traffic to its endpoints.
ServiceCIDRconfigured by · ServiceCIDR is a Kubernetes resource specifying IP address ranges from which Service cluster IP addresses are allocated.

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