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MetalLB - Kubernetes Bare-Metal Load Balancer (BGP/ARP)
A network load-balancer implementation for Kubernetes using standard routing protocols. Provides a way to get LoadBalancer-type services on bare metal, edge, and private cloud clusters.
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Added on 2025年6月6日7,558
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LanguageProject Introduction
Summary
MetalLB is a load-balancer implementation for bare metal Kubernetes clusters, using standard routing protocols. It allows you to create LoadBalancer services in environments where cloud provider integrations are not available.
Problem Solved
Kubernetes running on bare-metal or private cloud environments lacks a native network load balancer implementation, making it difficult to expose services externally using the standard LoadBalancer service type.
Core Features
IP Address Management
Automatically allocates and manages IP addresses for LoadBalancer services from a configurable pool.
Protocol Integration (BGP/ARP)
Integrates with standard network protocols like BGP and ARP to announce allocated IP addresses to the network.
Tech Stack
Go
Kubernetes
BGP
ARP
Docker
使用场景
MetalLB is ideal for scenarios where you need to provide external network access to services running on Kubernetes clusters that are not hosted on public clouds with native load balancer integrations.
Scenario 1: External Service Exposure
Details
Exposing web applications, APIs, or databases running inside Kubernetes services to the internet or internal networks using a stable external IP address.
User Value
Enables standard external access to applications on bare-metal K8s without requiring manual IP management or proprietary solutions.
Scenario 2: High Availability and Traffic Distribution
Details
Ensuring high availability and distributing incoming network traffic across multiple pod replicas for critical applications.
User Value
Leverages standard load balancing techniques to provide resilience and scalability for applications deployed in the cluster.
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