In this demo, we would like to deploy an image using Kubernetes and configure a service to access the application image.
- Go to settings → Kubernetes
- Check the option 'Enable Kubernetes'
- Click 'Apply & Restart'
Pods are configured in the yaml file. The image used is nginx. Create Deployment by running the following command:
$ kubectl apply -f ./run-my-nginx.yaml
deployment.apps/my-nginx created
After a few moments, the Deployments should be ready. You can check running Deployments by executing the command:
$ kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
my-nginx 2/2 2 2 23m
In this Deployment, we have specified 2 replicas in run-my-nginx.yaml. You can check running Pods too by running:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
my-nginx-5b56ccd65f-4sv4j 1/1 Running 0 9m26s
my-nginx-5b56ccd65f-nhrvb 1/1 Running 0 9m26s
As mentioned in the documentation, Kubernetes supports two ways of exposing a Service onto an external IP address: NodePorts and LoadBalancers. In this case, we use LoadBalancers. Run the following command to expose it:
$ kubectl expose deployment/my-nginx --port=80 --target-port=80 --type=LoadBalancer
service/my-nginx exposed
This specification will create a Service which targets TCP port 80 (target-port) on any Pod on the specified Deployment, and expose it on an abstracted Service port (port).
The Service created and configured can be checked with the following command:
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 50m
my-nginx LoadBalancer 10.97.81.204 localhost 80:30906/TCP 3m47s
After having connected the configured service, the nginx server can now be reached from any node by doing curl, which cannot be done without a configured service.
$ curl localhost:80
<!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>
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