Part 6: Test the Cluster
We’ll run the following tests:
- Create
nginxdeployment - Port-forward to
nginxpod - Check
nginxpod’s logs - Expose
nginx NodePort Service - Expose
nginx LoadBalancer Serviceon port 8080 - Test pod-to-pod connectivity
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| ~ # 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}/ |
Running In Production With Scissors 
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