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How to Deploy a Docker Container to Kubernetes

Once you have a Docker container, it is really simple to deploy it to Kubernetes.

Generate a Deployment YAML

kubectl provides a fantastic way to help generate deployment yamls.

kubectl create deployment <app_name> --image=<some/image> --dry-run=client -o yaml > <deployment_file_name>.yaml
Code language: Bash (bash)

Perform the Deployment

Now that we have a deployment yaml, we can simply run:

kubectl apply -f <deployment_file_name>.yaml
Code language: Bash (bash)

What next?

Next you might want to add a Service so that the deployment is available to the world.

Open up the deployment yaml file generated and add the following:

--- apiVersion: v1 kind: Service metadata: name: lb-service labels: app: lb-service spec: type: LoadBalancer ports: - port: 80 targetPort: 5000 selector: app: <app_name>
Code language: YAML (yaml)

Note that the above Service uses a LoadBalancer type, listens for requests on port 80, forwards them onto port 5000 to the app specified in the selector label.

We called this <app_name> above, which you should swap out with whatever appname you chose before. This is specified by the label used in the original yaml.

See also  How to Install App Mesh on AWS EKS
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