Block Ads and Tracking Domains with the CoreDNS ads Plugin
The CoreDNS ads plugin is a surprisingly effective way to stop tracking and ads at the DNS level, but most people think of it as just a simple blocklist.
CoreDNS Articles
50 articles
Reduce DNS Lookups in Kubernetes with CoreDNS autopath
CoreDNS itself is a DNS server, but it can also act as a DNS client, and when it does, it has a concept called "autopath" that can drastically reduce th.
Configure CoreDNS Cache Plugin to Reduce Upstream DNS Load
CoreDNS's cache plugin is a powerful tool for reducing latency and offloading your upstream DNS servers, but its effectiveness hinges on a few counter-i.
Simulate DNS Failures with the CoreDNS chaos Plugin
CoreDNS can simulate DNS failures using its chaos plugin, which allows you to inject errors into DNS responses to test how your applications handle them.
How CoreDNS Powers DNS Resolution Inside Kubernetes
CoreDNS is the default DNS server for Kubernetes, but its true power lies in its ability to be configured as a dynamic, pluggable system that adapts to .
CoreDNS Corefile Configuration: Zones, Plugins, and Chains
CoreDNS can serve DNS zones without explicitly defining them in the Corefile, which is a wild departure from traditional DNS server configuration.
Build a Custom CoreDNS Plugin in Go
Build a Custom CoreDNS Plugin in Go — CoreDNS is a flexible, extensible DNS server written in Go. While it comes with a rich set of built-.
Debug CoreDNS NXDOMAIN Errors in Kubernetes
CoreDNS is failing to resolve internal Kubernetes service names, resulting in NXDOMAIN errors for pods trying to reach other services.
Set Up DNS-over-HTTPS with CoreDNS
Set Up DNS-over-HTTPS with CoreDNS — practical guide covering coredns setup, configuration, and troubleshooting with real-world examples.
Configure Pod DNS Policy in Kubernetes with CoreDNS
Configure Pod DNS Policy in Kubernetes with CoreDNS. Pod DNS policy in Kubernetes determines how pods resolve domain names. Let's see this in action
Sign DNS Zones with DNSSEC Using CoreDNS
DNSSEC signing is a surprisingly complex dance of cryptographic keys and zone file management, often more about operational diligence than deep cryptogr.
Run CoreDNS Locally with Docker Compose for Testing
CoreDNS is a flexible, extensible DNS server that's become the default in Kubernetes. Running it locally with Docker Compose is a fantastic way to test .
Simulate Flaky DNS with the CoreDNS erratic Plugin
The erratic plugin for CoreDNS allows you to simulate intermittent DNS resolution failures, crucial for testing the resilience of applications that rely.
Use CoreDNS etcd Plugin for Dynamic Service Discovery
CoreDNS's etcd plugin turns your DNS server into a dynamic service discovery engine, letting services register themselves and be found by others without.
Load Balance DNS Responses with the CoreDNS external Plugin
Load Balance DNS Responses with the CoreDNS external Plugin — practical guide covering coredns setup, configuration, and troubleshooting with real-world...
Host Authoritative DNS Zones with the CoreDNS file Plugin
Host Authoritative DNS Zones with the CoreDNS file Plugin — practical guide covering coredns setup, configuration, and troubleshooting with real-world e...
Filter DNS Queries with the CoreDNS firewall Plugin
CoreDNS can drop DNS queries that match a specified blocklist, preventing them from reaching upstream servers and stopping clients from receiving potent.
Configure CoreDNS to Forward Queries to Upstream Resolvers
CoreDNS can be a surprisingly powerful network proxy, not just a DNS server. Let's say you have a cluster running CoreDNS, and it's handling all your in.
Get Started with CoreDNS: Install, Configure, and Run
CoreDNS is your new DNS resolver, and it's probably already running somewhere in your cluster. Here's a quick look at CoreDNS in action, resolving a DNS.
Monitor CoreDNS with a Grafana Dashboard
CoreDNS is actually a surprisingly flexible DNS server, but most people only ever use it to resolve names, missing its ability to act as a powerful obse.
Serve DNS over gRPC with CoreDNS
CoreDNS can serve DNS queries over gRPC, a high-performance, language-agnostic RPC framework. Here's a basic setup to get CoreDNS serving DNS over gRPC
Deploy CoreDNS in High Availability on Kubernetes
CoreDNS, when deployed for high availability on Kubernetes, doesn't inherently round-robin between instances; it relies on a sophisticated health check .
Configure CoreDNS Health and Readiness Probes for Kubernetes
CoreDNS health and readiness probes are how Kubernetes knows if your DNS service is actually working, not just if the process is running.
Deploy CoreDNS with Helm on Kubernetes
Deploy CoreDNS with Helm on Kubernetes — practical guide covering coredns setup, configuration, and troubleshooting with real-world examples.
Override DNS Records with the CoreDNS hosts Plugin
The CoreDNS hosts plugin lets you inject custom DNS records into your cluster's DNS resolution, effectively bypassing upstream DNS servers for specific .
Configure CoreDNS for Istio DNS Proxying
CoreDNS is actually a pluggable DNS server, meaning it's not a monolithic black box but a series of independent plugins that can be enabled or disabled .
Configure Kubernetes Cluster DNS with CoreDNS
CoreDNS is your cluster's phone book, but it's surprisingly complex because it's designed to be pluggable and extensible.
How the CoreDNS kubernetes Plugin Resolves Service DNS
CoreDNS, when acting as the Kubernetes DNS service, doesn't just look up A records; it's actively querying the Kubernetes API for information about Serv.
Replace kube-dns with CoreDNS in Kubernetes
CoreDNS is not just a drop-in replacement for kube-dns; it's a more flexible and extensible DNS server that can handle complex routing scenarios and cus.
Enable Debug Logging in CoreDNS to Trace DNS Queries
CoreDNS isn't actually a DNS server; it's a plugin-based server that can act as a DNS server by loading the right plugins.
Scrape CoreDNS Metrics with Prometheus
CoreDNS is a DNS server that's become the de facto standard in Kubernetes environments. While it's incredibly flexible and extensible, its performance a.
Migrate from kube-dns to CoreDNS Without Disrupting DNS
Migrate from kube-dns to CoreDNS Without Disrupting DNS — practical guide covering coredns setup, configuration, and troubleshooting with real-world exa...
Set Up Multi-Cluster DNS with CoreDNS
CoreDNS is a DNS server that can be extended with plugins, making it incredibly flexible for complex networking scenarios like multi-cluster DNS.
Fix Kubernetes DNS Latency by Tuning ndots and Search Domains
The Kubernetes DNS resolver is failing to get answers from CoreDNS quickly enough, causing pods to time out when trying to reach other services.
Tune CoreDNS Performance to Handle High Query Volume
CoreDNS can handle massive query volumes, but its default configuration is often tuned for general use, not peak performance.
How the CoreDNS Plugin Chain Works
The most surprising thing about CoreDNS's plugin chain is that it's not a chain at all, but a series of conditional transformations applied to a DNS req.
CoreDNS Production Best Practices: Scaling and Reliability
CoreDNS can drop DNS requests under heavy load if its worker goroutines become saturated, leading to increased latency and failed lookups.
Reload CoreDNS Config Automatically Without Restart
Reload CoreDNS Config Automatically Without Restart — practical guide covering coredns setup, configuration, and troubleshooting with real-world examples.
Rewrite DNS Queries and Responses with the CoreDNS rewrite Plugin
The CoreDNS rewrite plugin is less about changing what DNS records mean and more about changing how DNS queries and responses are expressed to fit diffe.
Configure Zone Transfers with the CoreDNS secondary Plugin
A DNS zone transfer isn't just copying records; it's a synchronized dance where a secondary nameserver asks the primary for the entire song sheet, and t.
Harden CoreDNS Against DNS Amplification and Spoofing
CoreDNS doesn't inherently protect against DNS amplification and spoofing attacks; it's a feature you have to explicitly configure.
Integrate CoreDNS with a Service Mesh for Name Resolution
CoreDNS is now the default DNS server in Kubernetes, and integrating it with a service mesh like Istio or Linkerd is a common task.
Set Up Split-Horizon DNS with CoreDNS for Internal and External Views
CoreDNS can be configured to serve different DNS records to clients based on their network origin, a technique called split-horizon DNS.
Configure CoreDNS Stub Domains for Custom Name Resolution
CoreDNS can be configured to act as a recursive DNS resolver, forwarding queries for specific domains to different DNS servers, effectively creating cus.
Set Up DNS-over-TLS with CoreDNS
CoreDNS is acting as a transparent proxy for DNS queries, and you're seeing SERVFAIL responses for some or all of your clients.
Troubleshoot Kubernetes DNS Resolution Failures with CoreDNS
CoreDNS failed to resolve external hostnames because it couldn't reach the upstream DNS servers it was configured to use.
Configure Upstream DNS Resolvers in CoreDNS
CoreDNS doesn't just blindly forward your DNS queries; it needs to know who to ask. This is where upstream DNS resolvers come in, and configuring them c.
CoreDNS vs BIND: Which DNS Server for Kubernetes
CoreDNS is a DNS server that's often used in Kubernetes, but BIND is another popular DNS server. Let's see how they handle a common DNS query
CoreDNS vs Unbound: Choose the Right Recursive Resolver
CoreDNS and Unbound are both excellent recursive DNS resolvers, but they solve slightly different problems and have different architectural philosophies.
Restrict DNS Query Access with the CoreDNS ACL Plugin
Restrict DNS Query Access with the CoreDNS ACL Plugin — practical guide covering coredns setup, configuration, and troubleshooting with real-world examp...