KubeSail: Get your free Kubernetes Cluster
If you’re looking for free Kubernetes Cluster to play around then KubeSail is right choice,its hosted Kubernetes provider and offers free managed namespace.With KubeSail you can deploy and host applications easily. In this post,we take look at how to deploy applications on to KubeSail cluster.
Image – KubeSail Logo
Once you have created your account on KubeSail,follow the below steps to deploy your applications.
Quick Snapshot
Step #1 : Get Kubectl configuration
From the account setup tab,get the kubectl configuration.To recap on what is kubectl,this is command line interface through which we can interact with Kubernetes API.
Image – KubeSail Account Page
Copy the contents of kubectl configuration and paste to your ~/.kube/config so that we can use kubectl to access our cluster.
If you’re looking for quickstart on basic understanding of Kubernetes concepts, please refer earlier posts for understanding on Kubernetes & how to create,deploy & rollout updates to the cluster.
Step #2 : Create deployment
Before creating deployment run kubectl get deployment to check if there are any deployments.
Image – Run kubectl get deployment to check if there are any deployments
Now that we have cluster ready,we can use kubectl create command to create new deployment. I already have deployment.yaml ready with the simple web app – nginx as container image.
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1
spec:
replicas: 1
template:
metadata:
labels:
app: webapp1
spec:
containers:
- name: webapp1
image: nginxinc/nginx-unprivileged
ports:
- containerPort: 8080
Image – Simple web app (nginx as container image) deployment.yaml
Image – Use kubectl create command to create deployment
Re-run kubectl get deployment to check if deployment has succeeded.
Congrats! We have just deployed first application on KubeSail by creating a deployment. Following is what the command has done for us:
- Searched for a suitable node where an instance of the application could be run (we have only 1 available node)
- Scheduled the webapp1(ngnix) application to run on that Node
- Configured the cluster to reschedule the instance on a new Node when needed
You can also run kubectl describe deployment to get more details of the deployment.
Image – Run kubectl describe deployment to view more details
Once the application instances are created, a Kubernetes Deployment Controller continuously monitors those instances. If the Node hosting an instance goes down or deleted, the Deployment controller replaces it.
Image – kubectl get pods will list the pods and its status
Some of the useful kubectl commands are below.
- kubectl get– list resources
- kubectl describe– show detailed information about a resource
- kubectl logs– print the logs from a container in a pod
- kubectl exec– execute a command on a container in a pod
From the KubeSail console too, you can view the deployments and its status.
Image – KubeSail Deployments
Step #3 : Expose ngnix app outside of the cluster
To expose the app on to the outside world, either we can create new service or from KubeSail Deployment page.For now,we are going to expose it from KubeSail Deployment page,click on ‘Ports’ to proceed.
Image – Expose app to outside world
Choose one of the option to get app exposed.
Image – Hurray! App exposed to outside world
Image – Nginx Landing Page
Congrats! We have just exposed our nginx application to outer world.
You can upgrade or downgrade your KubeSail cluster any time from your dashboard.Please check out Pricing page for more details.
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Additional Resources
- Kubernetes Official documentation
- Take Udemy course on Develop and Operate Microservices on Kubernetes
- Download FREE eBook on Kubernetes
