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ExternalDNS - Dynamic DNS Configuration for Kubernetes
Automates the synchronization of Kubernetes resources (like Services and Ingresses) with external DNS providers, enabling dynamic service discovery and access.
Go
Added on 2025年6月7日8,245
Stars2,697
ForksGo
LanguageProject Introduction
Summary
ExternalDNS is a Kubernetes add-on that synchronizes exposed Kubernetes Services and Ingresses with DNS providers. It allows you to control DNS records dynamically using Kubernetes resources, simplifying public and internal service discovery within and outside your cluster.
Problem Solved
Manually managing DNS records for dynamic Kubernetes workloads is time-consuming, error-prone, and doesn't scale well with frequently changing IP addresses or service endpoints. ExternalDNS solves this by automatically keeping DNS records in sync with the state of Kubernetes resources.
Core Features
Kubernetes Resource Watching
Monitors Kubernetes API for changes to Services, Ingresses, and other configured resources.
Multi-Provider Compatibility
Supports a wide range of DNS providers (e.g., AWS Route 53, Google Cloud DNS, Azure DNS, Cloudflare, etc.) via provider-specific APIs.
Automated Record Management
Creates or updates DNS records based on resource annotations and configurations.
Highly Configurable
Offers flexible configuration options for domain filtering, source selection, and more.
Tech Stack
Go
Kubernetes API
Various DNS Provider SDKs/APIs
Usage Scenarios
ExternalDNS is essential for scenarios requiring automated and dynamic DNS record management based on the state of Kubernetes applications:
Publicly Exposing Services/Ingresses
Details
Automatically create A/CNAME records pointing to LoadBalancer IPs or Ingress controller endpoints when Services or Ingresses are deployed.
User Value
Enables seamless access to applications from outside the cluster without manual DNS updates.
Internal Service Discovery
Details
Configure internal DNS records for cluster-internal services using solutions like CoreDNS, improving internal service discovery.
User Value
Simplifies communication between services within the Kubernetes cluster.
Automated SSL Certificate Issuance
Details
Used in conjunction with cert-manager to automate DNS01 challenges for ACME/Let's Encrypt certificates.
User Value
Automates the verification process required to obtain SSL certificates for Kubernetes workloads.
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