Kubernetes Cookbook - Second Edition

DNS for pod

Kubernetes assigns the domain name for the pod as <IP address>.<Namespace name>.pod.cluster.local. Because it uses the pod's IP address, FQDN is not guaranteed to be present permanently, but it is nice to have in case an application needs FQDN. 

Let's deploy apache2 (httpd) on chap8-domain1 and chap8-domain2, as follows:

$ kubectl run my-apache --image=httpd --namespace chap8-domain1deployment "my-apache" created$ kubectl run my-apache --image=httpd --namespace chap8-domain2deployment "my-apache" created

Type kubectl get pod -o wide to capture an IP address for those pods:

$ kubectl get pods -o wide --namespace=chap8-domain1NAME                         READY     STATUS    RESTARTS   AGE       IP           NODEmy-apache-55fb679f49-qw58f   1/1       Running   0          27s        172.17.0.4 minikube ...