Learn how to create Subdomains using Namespaces on DigitalOcean. Our DigitalOcean Support team is here to help you with your questions and concerns.

Create Subdomains using Namespaces on DigitalOcean

Did you know that setting up a subdomain using a namespace on DigitalOcean Kubernetes helps manage and deploy our applications?

Today, we are going to take a look at how to create a Kubernetes cluster, set up a namespace, deploy our application, configure ingress, and update DNS settings.

Set Up Kubernetes Cluster on DigitalOcean

1. First, log in to the DigitalOcean account.
2. Then, go to the Kubernetes section and create a new cluster. At this point, we can choose our cluster configuration, including the region and node size.
3. Next, we have to make sure we have kubectl installed on the local machine. We can use the kubectl tool to interact with Kubernetes clusters.

   # Install kubectl on Ubuntu
   sudo apt-get update
   sudo apt-get install -y kubectlCopy Code
4. Then, download the Kubernetes configuration file from the DigitalOcean control panel and set up kubectl to use it.

   # Save the configuration file and set the KUBECONFIG environment variable
   export KUBECONFIG=$HOME/.kube/configCopy Code

Create a Namespace

Now, we can create a new namespace in our Kubernetes cluster with kubectl:

kubectl create namespace mynamespaceCopy Code

Deploy Application

Now, we have to deploy our application to the newly created namespace. We can use a deployment YAML file to specify the namespace.

apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp
namespace: mynamespace
spec:
replicas: 2
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: myapp:latest
ports:
- containerPort: 80
Copy Code

Then, apply the deployment as seen here:

kubectl apply -f deployment.yamlCopy Code

Configure Ingress to Use Subdomain

1. Next, install an ingress controller in the cluster to manage external access to our services. DigitalOcean offers an easy way to install the NGINX ingress controller.

   kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/cloud/deploy.yamlCopy Code
2. Then, create an ingress resource to route traffic to our application using the subdomain.

   
   apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:
   name: myapp-ingress
   namespace: mynamespace
   annotations:
   nginx.ingress.kubernetes.io/rewrite-target: /
   spec:
   rules:
   - host: sub.example.com
   http:
   paths:
   - path: /
   pathType: Prefix
   backend:
   service:
   name: myapp-service
   port:
   number: 80
   Copy Code
3. Now, apply the ingress as seen here:

   kubectl apply -f ingress.yamlCopy Code

Update DNS Settings

1. In the DigitalOcean control panel, go to the Networking section and select the domain.
2. Then, add a new CNAME record for the subdomain, pointing to the DigitalOcean Kubernetes Load Balancer IP address.

   Type: CNAME
   Name: sub
   Value: <Load Balancer IP>
   TTL: 3600
   Copy Code

Benefits of Using Namespace and Subdomain

• Namespaces offer isolation for different environments or different applications.
• Using subdomains helps in organizing and routing traffic to different applications or parts of an application.
• This approach scales well with additional services or applications, each with its own namespace and subdomain.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In brief, our Support Experts demonstrated how to create Subdomains using Namespaces on DigitalOcean.