Generated apiserver certificate and key. : docker version is greater than the most recently validated version. # kubeadm init -feature-gates CoreDNS=true Use the following command to install CoreDNS as default DNS service while installing a fresh Kubernetes cluster. In order to install CoreDNS instead of kube-dns for a fresh Kubernetes cluster, we need to use the feature-gates flag and set it to CoreDNS=true. Installing CoreDNS in fresh Kubernetes cluster A restart of the CoreDNS pod is required for the changes to take effect. We can modify the default behavior by modifying this configmap. proxy: Any queries that are not within the cluster domain of Kubernetes will be forwarded to predefined resolvers (/etc/nf).prometheus: Metrics of CoreDNS are available at in Prometheus format. Upstream is used for resolving services that point to external hosts (External Services). The pods insecure option is provided for backward compatibility with kube-dns. We can modify and choose the desired values through the kubeadm -service-dns-domain and -service-cidr flags. The Kubernetes plugin has its options Cluster Domain and Service CIDR defined as cluster.local and 10.96.0.0/12 respectively by default through kubeadm. kubernetes: CoreDNS will reply to DNS queries based on IP of the services and pods of Kubernetes.health: Health of CoreDNS is reported to.This configuration is based on the following plugins of CoreDNS: The Corefile part is the configuration of CoreDNS. SelfLink: /api/v1/namespaces/kube-system/configmaps/coredns # kubectl -n kube-system get configmap coredns -oyaml
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