Adventures in Freebernetes Tutorial: Build Your Own Bare-VM k3s Cluster

Part 6: Test the Cluster

We’ll run the following tests:

Create nginx deployment
Port-forward to nginx pod
Check nginx pod’s logs
Expose nginx NodePort Service
Expose nginx LoadBalancer Service on port 8080
Test pod-to-pod connectivity

	~ # kubectl create deployment nginx –image=nginx
	deployment.apps/nginx created
	~ # kubectl get pods
	NAME READY STATUS RESTARTS AGE
	nginx-6799fc88d8-wt9qr 1/1 Running 0 53m
	~ # POD=$(kubectl get pods -l app=nginx -ojsonpath="{.items[0].metadata.name}")
	~ # PID="$(kubectl port-forward $POD 8080:80 >/dev/null 2>&1 & echo $!)"
	~ # curl http://localhost:8080/
	<!DOCTYPE html>
	<html>
	<head>
	<title>Welcome to nginx!</title>
	<style>
	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>
	~ # kill "$PID"
	~ # kubectl logs $POD
	/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
	/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
	/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
	10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
	10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
	/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
	/docker-entrypoint.sh: Configuration complete; ready for start up
	127.0.0.1 – – [26/Dec/2020:05:36:22 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.73.0" "-"
	~ # kubectl expose deployment nginx –port 80 –type NodePort
	service/nginx exposed
	~ # kubectl get svc
	NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
	kubernetes ClusterIP 10.2.0.1 <none> 443/TCP 4h14m
	nginx NodePort 10.2.37.161 <none> 80:30234/TCP 11s
	~ # CLUSTERIP="$(kubectl get svc nginx -ojsonpath='{.spec.clusterIP}')"
	~ # curl -I http://${CLUSTERIP}/
	HTTP/1.1 200 OK
	Server: nginx/1.19.6
	Date: Sat, 26 Dec 2020 07:20:34 GMT
	Content-Type: text/html
	Content-Length: 612
	Last-Modified: Tue, 15 Dec 2020 13:59:38 GMT
	Connection: keep-alive
	ETag: "5fd8c14a-264"
	Accept-Ranges: bytes

	~ # kubectl delete svc nginx
	service "nginx" deleted
	~ # kubectl expose deployment nginx –port 8080 –target-port 80 –type LoadBalancer
	service/nginx exposed
	~ # kubectl get svc
	NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
	kubernetes ClusterIP 10.2.0.1 <none> 443/TCP 6h26m
	nginx LoadBalancer 10.2.196.18 10.0.10.21 8080:32282/TCP 11s
	~ # LBIP="$(kubectl get svc nginx -ojsonpath='{.status.loadBalancer.ingress[0].ip}')"
	~ # curl -I http://${LBIP}:8080/
	HTTP/1.1 200 OK
	Server: nginx/1.19.6
	Date: Sat, 26 Dec 2020 07:51:23 GMT
	Content-Type: text/html
	Content-Length: 612
	Last-Modified: Tue, 15 Dec 2020 13:59:38 GMT
	Connection: keep-alive
	ETag: "5fd8c14a-264"
	Accept-Ranges: bytes

	~ # PODIP="$(kubectl get pod "$POD" -ojsonpath='{.status.podIP}')"
	~ # kubectl run -it busybox –image busybox –rm=true –restart=Never — wget -q -S -O /dev/null http://${PODIP}/
	HTTP/1.1 200 OK
	Server: nginx/1.19.6
	Date: Sat, 26 Dec 2020 08:20:54 GMT
	Content-Type: text/html
	Content-Length: 612
	Last-Modified: Tue, 15 Dec 2020 13:59:38 GMT
	Connection: close
	ETag: "5fd8c14a-264"
	Accept-Ranges: bytes

	pod "busybox" deleted
	~ #

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	# Create deployment
	kubectl create deployment nginx –image=nginx
	kubectl get pods
	# Port-forward to pod
	POD=$(kubectl get pods -l app=nginx -ojsonpath="{.items[0].metadata.name}")
	PID="$(kubectl port-forward $POD 8080:80 >/dev/null 2>&1 & echo $!)"
	curl http://localhost:8080/
	kill "$PID"
	# Check pod logs
	kubectl logs $POD
	# Create NodePort service
	kubectl expose deployment nginx –port 80 –type NodePort
	kubectl get svc
	CLUSTERIP="$(kubectl get svc nginx -ojsonpath='{.spec.clusterIP}')"
	curl -I http://${CLUSTERIP}/
	kubectl delete svc nginx
	# Create LoadBalancer Service
	kubectl expose deployment nginx –port 8080 –target-port 80 –type LoadBalancer
	kubectl get svc
	LBIP="$(kubectl get svc nginx -ojsonpath='{.status.loadBalancer.ingress[0].ip}')"
	curl -I http://${LBIP}:8080/
	kubectl delete svc nginx
	# Test pod-to-pod connectivity
	PODIP="$(kubectl get pod "$POD" -ojsonpath='{.status.podIP}')"
	kubectl run -it busybox –image busybox –rm=true –restart=Never — wget -q -S -O /dev/null http://${PODIP}/

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