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08-smoke-test.md

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Smoke Test

In this lab you will complete a series of tasks to ensure your Kubernetes cluster is functioning correctly.

Check CoreDNS Nodes

CoreDNS pods should be running now

kubectl get pods -n kube-system -o wide | grep coredns

output

coredns-64897985d-5wvq7                    1/1     Running   0             52m     10.142.0.193   worker-2       <none>           <none>
coredns-64897985d-lqj8r                    1/1     Running   0             52m     10.142.0.128   controller-2   <none>           <none>

Core DNS Verification

Create a busybox deployment:

kubectl run busybox --image=busybox:1.28 --command -- sleep 3600

List the pod created by the busybox deployment:

kubectl get pods -l run=busybox

output

NAME                      READY   STATUS    RESTARTS   AGE
busybox-bd8fb7cbd-vflm9   1/1     Running   0          10s

Execute a DNS lookup for the kubernetes service inside the busybox pod:

kubectl exec -ti busybox -- nslookup kubernetes

output

Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

Deployments

In this section you will verify the ability to create and manage Deployments.

Create a deployment for the nginx web server:

kubectl create deployment nginx --image=nginx

List the pod created by the nginx deployment:

kubectl get pods -l app=nginx

output

NAME                    READY   STATUS    RESTARTS   AGE
nginx-dbddb74b8-6lxg2   1/1     Running   0          10s

Services

In this section you will verify the ability to access applications remotely using port forwarding.

Create a service to expose deployment nginx on node ports.

kubectl expose deploy nginx --type=NodePort --port 80

PORT_NUMBER=$(kubectl get svc -l app=nginx -o jsonpath="{.items[0].spec.ports[0].nodePort}")

Test to view NGINX page

curl http://worker-1:$PORT_NUMBER
curl http://worker-2:$PORT_NUMBER

output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Logs

In this section you will verify the ability to retrieve container logs.

Retrieve the full name of the nginx pod:

POD_NAME=$(kubectl get pods -l app=nginx -o jsonpath="{.items[0].metadata.name}")

Print the nginx pod logs:

kubectl logs $POD_NAME

output

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2022/03/22 20:01:06 [notice] 1#1: using the "epoll" event method
2022/03/22 20:01:06 [notice] 1#1: nginx/1.21.6
2022/03/22 20:01:06 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
2022/03/22 20:01:06 [notice] 1#1: OS: Linux 5.4.0-104-generic
2022/03/22 20:01:06 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2022/03/22 20:01:06 [notice] 1#1: start worker processes
2022/03/22 20:01:06 [notice] 1#1: start worker process 31
172.22.5.21 - - [22/Mar/2022:20:01:43 +0000] "GET / HTTP/1.1" 200 615 "-" "curl/7.68.0" "-"
10.142.0.192 - - [22/Mar/2022:20:01:45 +0000] "GET / HTTP/1.1" 200 615 "-" "curl/7.68.0" "-"

Exec

In this section you will verify the ability to execute commands in a container.

Print the nginx version by executing the nginx -v command in the nginx container:

kubectl exec -ti $POD_NAME -- nginx -v

output

nginx version: nginx/1.21.6

Clean Up

kubectl delete deployment nginx --force
kubectl delete pod busybox --force

Next: Optional - MetalLB Loadbalancer