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Update to Kubernetes 1.12.0 and add CoreDNS support

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Kelsey Hightower
2018-09-30 19:35:05 +00:00
parent b974042d95
commit bf2850974e
10 changed files with 118 additions and 106 deletions
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27
docs/12-dns-addon.md
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@@ -1,22 +1,24 @@
# Deploying the DNS Cluster Add-on
In this lab you will deploy the [DNS add-on](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/) which provides DNS based service discovery to applications running inside the Kubernetes cluster.
In this lab you will deploy the [DNS add-on](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/) which provides DNS based service discovery, backed by [CoreDNS](https://coredns.io/), to applications running inside the Kubernetes cluster.
## The DNS Cluster Add-on
Deploy the `kube-dns` cluster add-on:
Deploy the `coredns` cluster add-on:
```
kubectl create -f https://storage.googleapis.com/kubernetes-the-hard-way/kube-dns.yaml
kubectl apply -f https://storage.googleapis.com/kubernetes-the-hard-way/coredns.yaml
```
> output
```
service "kube-dns" created
serviceaccount "kube-dns" created
configmap "kube-dns" created
deployment.extensions "kube-dns" created
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.extensions/coredns created
service/kube-dns created
```
List the pods created by the `kube-dns` deployment:
@@ -28,8 +30,9 @@ kubectl get pods -l k8s-app=kube-dns -n kube-system
> output
```
NAME READY STATUS RESTARTS AGE
kube-dns-3097350089-gq015 3/3 Running 0 20s
NAME READY STATUS RESTARTS AGE
coredns-699f8ddd77-94qv9 1/1 Running 0 20s
coredns-699f8ddd77-gtcgb 1/1 Running 0 20s
```
## Verification
@@ -37,7 +40,7 @@ kube-dns-3097350089-gq015 3/3 Running 0 20s
Create a `busybox` deployment:
```
kubectl run busybox --image=busybox --command -- sleep 3600
kubectl run busybox --image=busybox:1.28 --command -- sleep 3600
```
List the pod created by the `busybox` deployment:
@@ -49,8 +52,8 @@ kubectl get pods -l run=busybox
> output
```
NAME READY STATUS RESTARTS AGE
busybox-2125412808-mt2vb 1/1 Running 0 15s
NAME READY STATUS RESTARTS AGE
busybox-bd8fb7cbd-vflm9 1/1 Running 0 10s
```
Retrieve the full name of the `busybox` pod: