Loadbalancer service

As explained in Acing the Certified Kubernetes Administrator Exam, Second Edition

A Kubernetes LoadBalancer Service type exposes a Service externally through an integrated or provisioned load balancer.

A LoadBalancer Service exposes an application outside the Kubernetes cluster through a cloud-provisioned or bare-metal load balancer. Its YAML resembles a ClusterIP Service; setting type to LoadBalancer is the key change, and a node port is not required for access. section 6.4.3

Create and verify a LoadBalancer Service with these administrator tasks:

• Generate a manifest with kubectl create svc loadbalancer lb-svc --tcp 8080:8080 --dry-run=client -o yaml > lb-svc.yaml. section 6.4.3
• In a kind cluster, install MetalLB and configure an IPAddressPool and L2Advertisement using addresses from the node network. section 6.4.3
• Run kubectl get svc and confirm TYPE is LoadBalancer and EXTERNAL-IP contains an allocated address. section 6.4.3

Observed external access

A Service can report TYPE LoadBalancer, an external address such as 172.18.255.1, and port 80:30499/TCP. Curling the external address returns the application response. section 6.4.3

Figure 6.13 YAML that creates a LoadBalancer Service

Use the YAML figure to compare the LoadBalancer manifest with ClusterIP and NodePort definitions. section 6.4.3

How Acing the Certified Kubernetes Administrator Exam, Second Edition covers it

How deep it goes

Explains manifest creation, MetalLB configuration, and verification but defers load-balancer device internals.

Examples

Uses kubectl-generated YAML, MetalLB address-pool manifests, kubectl get svc output, and curl verification.

What it assumes

Assumes basic Kubernetes Services and cluster networking while teaching LoadBalancer creation from a generated manifest.

What you can do after

Operate and verify a LoadBalancer Service using kubectl, YAML, MetalLB, and an external request.

How it connects

Connects LoadBalancer Services with ClusterIP, NodePort, MetalLB, ingress, and CoreDNS.

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Also explained in

• 

  liveBookmanning.com
  Kubernetes in Action, Second EditionThe LoadBalancer service type requests an externally accessible load balancer for a Kubernetes Service from the cluster's cloud infrastructure.
• 

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  Road to KubernetesA Kubernetes LoadBalancer Service is a Service type that provisions or integrates with an external load balancer to expose workloads outside the cluster.
• 

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  Machine Learning Platform EngineeringA LoadBalancer service is a Kubernetes service that provisions or uses an external load balancer to expose selected pods to external clients.
• 

  liveBookmanning.com
  Kubernetes for DevelopersA LoadBalancer Service is a Kubernetes Service type that requests an externally reachable network load balancer and external IP address.

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Related concepts

• IP addressproduces · An IP address is a numerical address used by the Internet Protocol to identify a network interface and support packet delivery across networks.
• load balancinguses · Load balancing is the distribution of requests or computational work across multiple resources to manage demand, reduce workload imbalance, and improve utilization or availability.
• Airflow API serverconfigures · The Airflow API server is the service interface for viewing workflows, monitoring runs, and mediating database access for Airflow components.
• clusterip service typealternative to · ClusterIP is a Kubernetes Service type that exposes selected Pods through a stable virtual IP address accessible only within the cluster.
• 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.
• ingress objectcontrasts with · A Kubernetes Ingress is an API resource that specifies rules for routing external HTTP and HTTPS requests to services within a cluster.

This explainer was generated by Manning's knowledge graph from the text of Acing the Certified Kubernetes Administrator Exam, Second Edition. The section links point to the parts of the book it draws on.