How to Configure DNS for A Cluster? A Step-By-Step Guide
The following are the steps for configuring DNS for a Kubernetes Cluster:
Step 1 : Choose DNS Solution
- Select the DNS solution like CoreDNS or kube-DNS on considering its comptability with the kuberentes version and the specific reqirements.
Step 2: Install DNS Add-on
- Deploy the chosen DNS add-on to the kubernetes cluster using appropriate deployment method such as YAML manifests or package managers like Helm.
Step 3: Customize Configuration
- Try to modify the configuration file of the DNS server as per the requirements that suits for the cluster’s requirements. It involves in adjusting the DNS policies, specifying the custom DNS providers or configuring additional plugins.
Step 4: Update CoreDNS/Corefile
- If the using the DNS server is CoreDNS then update the corefile for defining the DNS zones, plugins, and upstream resolvers as per needed. Make ensure that the desired changes are reflected on DNS behaviour for the cluster.
Step 5: Verify Configuration
- Now, test the configurations by resolving its domain names from within the cluster and ensuring that the DNS querires are properly routed to the DNS service.
Step 6: Monitor and Maintain
- By regularly maintaining the DNS performances, we can resolve any issues promptly. Maintaince of DNS configurations by updating it respective to the cluster evolves is recommended practice.
Kubernetes – Service DNS
An open-source container orchestration system called Kubernetes is primarily employed for the automated deployment, scaling, and management of software. Another name for Kubernetes is K8s. Initially created by Google, Kubernetes is currently maintained by the Cloud Native Computing Foundation. Although it now supports both containers and CRI-O in addition to the Docker runtime with which it was first intended to communicate.
Automating the operational chores of container management is Kubernetes’ primary goal. It has built-in commands for application deployment and rolling out necessary modifications to the application. Companies like Google, Spotify, and Capital One are now using it.
Table of Content
- What is DNS?
- What is Kubernetes Services DNS?
- Namespaces of Services
- DNS Records
- What Is CoreDNS?
- Difference Between Kube-DNS And CoreDNS
- Confguration Files: Corefile
- DNS For Services And Pods
- Kubernetes Service DNS
- Types of DNS Services
- Pods
- Features of DNS services
- DNS search Domain List Limits
- Customizing DNS Service
- Using CoreDNS for Service Discovery
- How to Configure DNS for A Cluster? A Step-By-Step Guide
- Pod’s DNS Policy
- Trouble Shooting Issues of Kubernetes DNS
- Best Practices of Kubernetes External DNS