Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Make the command work with multiple pods too #9454

Merged
merged 2 commits into from
Jul 20, 2018
Merged

Make the command work with multiple pods too #9454

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
945eb38
Make the command work with multiple pods too
mastrolinux Jul 10, 2018
1c0060d
Remove dollar sign to respect style guidelines
mastrolinux Jul 19, 2018
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 14 additions & 12 deletions content/en/docs/tasks/administer-cluster/dns-debugging-resolution.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,10 @@ Create a file named busybox.yaml with the following contents:
Then create a pod using this file and verify its status:

```shell
$ kubectl create -f https://k8s.io/examples/admin/dns/busybox.yaml
kubectl create -f https://k8s.io/examples/admin/dns/busybox.yaml
pod "busybox" created

$ kubectl get pods busybox
kubectl get pods busybox
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 0 <some-time>
```
Expand All @@ -39,7 +39,7 @@ Once that pod is running, you can exec `nslookup` in that environment.
If you see something like the following, DNS is working correctly.

```shell
$ kubectl exec -ti busybox -- nslookup kubernetes.default
kubectl exec -ti busybox -- nslookup kubernetes.default
Server: 10.0.0.10
Address 1: 10.0.0.10

Expand All @@ -56,7 +56,7 @@ Take a look inside the resolv.conf file.
[Known issues](#known-issues) below for more information)

```shell
$ kubectl exec busybox cat /etc/resolv.conf
kubectl exec busybox cat /etc/resolv.conf
```

Verify that the search path and name server are set up like the following
Expand All @@ -72,7 +72,7 @@ Errors such as the following indicate a problem with the kube-dns add-on or
associated Services:

```
$ kubectl exec -ti busybox -- nslookup kubernetes.default
kubectl exec -ti busybox -- nslookup kubernetes.default
Server: 10.0.0.10
Address 1: 10.0.0.10
Expand All @@ -82,7 +82,7 @@ nslookup: can't resolve 'kubernetes.default'
or

```
$ kubectl exec -ti busybox -- nslookup kubernetes.default
kubectl exec -ti busybox -- nslookup kubernetes.default
Server: 10.0.0.10
Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local
Expand All @@ -94,7 +94,7 @@ nslookup: can't resolve 'kubernetes.default'
Use the `kubectl get pods` command to verify that the DNS pod is running.

```shell
$ kubectl get pods --namespace=kube-system -l k8s-app=kube-dns
kubectl get pods --namespace=kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
...
kube-dns-v19-ezo1y 3/3 Running 0 1h
Expand All @@ -110,9 +110,11 @@ have to deploy it manually.
Use `kubectl logs` command to see logs for the DNS daemons.

```shell
$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c kubedns
$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c dnsmasq
$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c sidecar
kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c kubedns

kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c dnsmasq

kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c sidecar
```

See if there is any suspicious log. Letter '`W`', '`E`', '`F`' at the beginning
Expand All @@ -126,7 +128,7 @@ to report unexpected errors.
Verify that the DNS service is up by using the `kubectl get service` command.

```shell
$ kubectl get svc --namespace=kube-system
kubectl get svc --namespace=kube-system
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
...
kube-dns 10.0.0.10 <none> 53/UDP,53/TCP 1h
Expand All @@ -144,7 +146,7 @@ You can verify that DNS endpoints are exposed by using the `kubectl get endpoint
command.

```shell
$ kubectl get ep kube-dns --namespace=kube-system
kubectl get ep kube-dns --namespace=kube-system
NAME ENDPOINTS AGE
kube-dns 10.180.3.17:53,10.180.3.17:53 1h
```
Expand Down