This is in continuation on Kubernetes article series.In the earlier posts, we have seen how to create & deploy simple cluster.Now in this post,we are going to look at recently launched offering from Microsoft Azure.
Azure Container Service (AKS) is managed Kubernetes offering from Azure.As a hosted Kubernetes service, Azure handles all heavy lifting of all the complexity, operational overhead of managing a Kubernetes cluster for you.
As a managed Kubernetes service, AKS provides:
- Automated Kubernetes version upgrades and patching
- Easy cluster scaling
- Self-healing hosted control plane (masters)
- Cost savings – pay only for running agent pool nodes
In short, AKS would provide a container hosting environment by using open-source tools and technologies. To this end, standard Kubernetes API standard endpoints are exposed and you can leverage any software that is capable of talking to a Kubernetes cluster.Like for example,kubectl
Now we can see how to create simple cluster using AKS.
Running Kubernetes on Microsoft Azure
- Running Kubernetes on Microsoft Azure
- Step#1.Launch Azure Cloud Shell
- Step#2.Enable AKS Preview
- Step#3.Resource group creation
- Step#4.Kubernetes cluster creation
- Step#5.Connect to Kubernetes cluster
- Step#6. Deploy new application on the cluster
- Step#7. Create service
- Step#8. Clean up
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Step#1.Launch Azure Cloud Shell
Once you login to Azure Portal,on the upper right corner,there is an option to Azure Cloud Shell.Azure Cloud Shell is a free Bash shell has the Azure CLI preinstalled and configured to use with your account.
Step#2.Enable AKS Preview
From the Azure Shell,enable AKS preview by the below command.
az provider register -n Microsoft.ContainerService
On the registrationState field you can see that its ‘Registering’,you can check the status of the registration by following command.
az provider show -n Microsoft.ContainerService
Once registration is complete, we are now ready to create a Kubernetes cluster with AKS.
Step#3.Resource group creation
Before we create the cluster & nodes,we would need to create Azure resource group which is nothing but a logical group in which Azure resources are deployed and managed.
Create new resource using below command.
az group create --name k8SResourceGroup --location westus2
Before proceeding to the next step,check the provisioningState on the ouput.It should be “Succeeded”
Step#4.Kubernetes cluster creation
Creates a sample cluster named myK8sCluster with one node.
az aks create --resource-group k8SResourceGroup --name myK8sCluster --node-count 1 --generate-ssh-keys
Above command would take sometime to create the cluster, once the command completes and returns JSON-formatted information about the cluster.
Step#5.Connect to Kubernetes cluster
For us to connect, manage Kubernetes cluster, we are going to use kubectl, the Kubernetes command-line client.Azure cloud shell has already built-in kubectl so we don’t have to install them separately.
To configure kubectl to connect to our Kubernetes cluster, run the following command. This step downloads credentials and configures the Kubernetes CLI to use them.
az aks get-credentials --resource-group k8SResourceGroup --name myK8sCluster
To verify kubectl configuration, check the version of kubectl
Step#6. Deploy new application on the cluster
Now we are going to create new Kubernetes manifest file that defines a desired state for the cluster, including what container images should be running etc.,
Create file named Deployment.yml,you can use vi editor to create this file.
apiVersion: apps/v1beta1 kind: Deployment metadata: name: nginx-deployment spec: replicas: 1 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:latest ports: - containerPort: 80
Use the kubectl create command to deploy the application.
In this example:
- A Deployment named nginx-deployment is created, indicated by the metadata: name field.
- The Deployment creates 1 replicated Pods, indicated by the replicas field.
- The Pod template’s specification, or template: spec field, indicates that the Pods run one container, nginx, which runs the nginx Docker Hub latest image (you can also specify the version ex.1.7.9.)
- The Deployment opens port 80 for use by the Pods.
Now that deployment is created,lets check the deployment information using kubectl get deployment command :
When you inspect the Deployments in your cluster, the following fields are displayed:
NAMElists the names of the Deployments in the cluster.
DESIREDdisplays the desired number of replicas of the application, which you define when you create the Deployment. This is the desired state.
CURRENTdisplays how many replicas are currently running.
UP-TO-DATEdisplays the number of replicas that have been updated to achieve the desired state.
AVAILABLEdisplays how many replicas of the application are available to your users.
AGEdisplays the amount of time that the application has been running.
Describe the deployment using kubectl describe deployment command to check the details on the deployment.
Step#7. Create service
Service is an abstraction which defines a logical set of
Pods and a policy by which to access them (micro-service). The set of
Pods targeted by a
Service is determined by a
Kubernetes has powerful networking capabilities that control how applications communicate. These networking configurations can also be controlled via YAML.The Service selects all applications with the label ngnix. As multiple replicas, or instances, are deployed, they will be automatically load balanced based on this common label. The Service makes the application available via a NodePort.
Create new file named svc.yml to define load balancers & apps.
apiVersion: v1 kind: Service metadata: name: nginx-svc labels: app: nginx spec: type: LoadBalancer ports: - port: 80 selector: app: nginx
Use kubectl create command to create new service based on the svc.yaml file created in the previous step.
Once the External-IP is available,we can browse the ngnix page.
Step#8. Clean up
Finally now its time to clean up the resources what we have created:
kubectl delete service my-nginx
kubectl delete deployment my-nginx
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