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Cluster Add-on: DNS

Kubernetes offers a DNS cluster add-on that provides DNS A and SRV records for Kubernetes services. The heavy lifting is done by SkyDNS, an etcd backed DNS server that supports dynamic updates from the Kubernetes API.

laptop

Allow add-ons to query the API server

gcloud compute firewall-rules create default-allow-local-api \
  --allow tcp:8080 \
  --source-ranges 10.200.0.0/16

node0

gcloud compute ssh node0

Download the SkyDNS replication controller configuration:

wget https://kuar.io/skydns-rc.yaml

Edit the SkyDNS rc config:

vim skydns-rc.yaml

- -kube_master_url=http://node0.c.PROJECT_NAME.internal:8080

Create the SkyDNS replication controller:

/opt/bin/kubectl create -f skydns-rc.yaml

Next create the SkyDNS service:

/opt/bin/kubectl create -f https://kuar.io/skydns-svc.yaml

Validate

/opt/bin/kubectl get rc --all-namespaces

Test DNS lookups

wget https://kuar.io/busybox.yaml

cat busybox.yaml

/opt/bin/kubectl create -f busybox.yaml

/opt/bin/kubectl get pods busybox

/opt/bin/kubectl exec busybox -- nslookup kubernetes