We are going to be adding a host alias for example.com in this example by adding the following to the coredns configmap:
Code Block |
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hosts custom.hosts example.com {
1.2.3.4 example.com
fallthrough
} |
Start by editing the coredns configmap:
Code Block | ||||
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| ||||
kubectl -n kube-system edit configmap/coredns |
Code Block |
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apiVersion: v1
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
hosts custom.hosts |
Code Block |
apiVersion: v1 kind: ConfigMap metadata: name: coredns-custom namespace: kube-system data: example.server: | # All custom server files must have a ".server" file extension. # Change example.com to the domain you wish to forward. example.com { # Change 1.2.13.1.1 to your customer DNS resolver.4 example.com fallthrough forward . 1.1.1.1 } } |
Create the ConfigMap by entering:
kubectl apply -f <filename>.yaml
Verify the customizations have been applied by entering:
...
Force CoreDNS to reload the ConfigMap by entering:
kubectl delete pod --namespace kube-system -l k8s-app=kube-dns
References
Reference | URL | Configuring|||
---|---|---|---|---|
** Add a Custom Host to Kubernetes | https:// | docshjrocha. | oraclemedium.com/ | en-us/iaas/Content/ContEng/Tasks/contengconfiguringdnsserver.htmadd-a-custom-host-to-kubernetes-a06472cedccb |
Customizing DNS Service | https://kubernetes.io/docs/tasks/administer-cluster/dns-custom-nameservers/ | |||
Debugging DNS Resolution | https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/ | |||
Custom DNS Entries For Kubernetes | https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/ |
...