Loadbalancer service

As explained in Machine Learning Platform Engineering

A LoadBalancer service is a Kubernetes service that provisions or uses an external load balancer to expose selected pods to external clients.

A LoadBalancer service exposes selected Kubernetes pods to external clients through an external load balancer. It preserves stable access while pods are restarted, deleted, or rescheduled. section 3.3.4

Configure the service with:

• apiVersion: v1, kind: Service, and type: LoadBalancer. section 3.3.4
• A port exposed by the service and a targetPort where the application listens on selected pods. section 3.3.4
• A selector matching the application labels, such as app: fast-api. section 3.3.4

Expose an application externally

Apply a manifest with type: LoadBalancer, port: 80, targetPort: 8083, and selector app: fast-api using kubectl create -f loadbalancer-service.yaml. Check kubectl get service for the assigned EXTERNAL-IP, then send requests such as curl http://34.101.34.188:80. section 3.3.4

Figure 3.6 The user interacts with service 1 to access the frontend application. The frontend application talks to the backend application via service 2. Services here act as an abstraction.

Use the service-abstraction diagram to trace external traffic through the load balancer to application pods. section 3.3.4

How Machine Learning Platform Engineering covers it

How deep it goes

Demonstrates manifest fields, creation, assigned external IPs, and requests, while deferring provider-specific configuration details.

Examples

Uses a FastAPI joke service, a LoadBalancer manifest, kubectl create, kubectl get service, and curl.

What it assumes

Assumes basic Kubernetes objects, pods, labels, ports, services, and kubectl usage.

What you can do after

Operate external access by applying a manifest, retrieving the assigned external IP, and issuing HTTP requests.

How it connects

Connects Kubernetes Services with pods, selectors, ports, ClusterIP, NodePort, and external load balancers.

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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.
• 

  liveBookmanning.com
  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.
• 

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

  liveBookmanning.com
  Acing the Certified Kubernetes Administrator Exam, Second EditionA Kubernetes LoadBalancer Service type exposes a Service externally through an integrated or provisioned load balancer.

Compare how 5 books explain loadbalancer service →

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.
• 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.
• Airflow API serverconfigures · The Airflow API server is the service interface for viewing workflows, monitoring runs, and mediating database access for Airflow components.
• 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 Machine Learning Platform Engineering. The section links point to the parts of the book it draws on.