Deploying Applications on AKS

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Florin Angelescu

Azure Cloud Architect

Deploy applications

Deploy Deny

Deploy Deny

  • You don't deploy containers directly.
  • You describe the desired state of your application.
  • Kubernetes handles the rest.
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Deploy applications

 

Deployment

 

  • You define through the manifest:

    • How many instances
    • Which image to use
    • How they should behave

  • Kubernetes keeps reality aligned with that definition.

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From image to pods

 

Deployment

 

 

  • Applications deployed to AKS are packaged as container images.
  • Typically stored in Azure Container Registry.
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From image to pods

Deployment

Deployment

  • AKS pulls the specified image.
  • Schedules pods onto available nodes in the cluster.
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From image to pods

 

Deployment

 

  • Pod = one running instance of your application.

  • Multiple replicas are defined:

    • Kubernetes creates multiple pods
    • Potentially across different nodes
    • Improves availability and resilience
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Deployments and replicas

 

Deployment

 

  • Kubernetes deployment is responsible for managing pods over time.
  • Ensures the correct number of replicas are running.
  • Replaces pods automatically if they fail.
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Deployments and replicas

 

Deployment

 

  • A pod crashes or a node becomes unavailable.
  • Kubernetes detects the issue.
  • Recreates the pod elsewhere in the cluster.
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Exposing applications

Replicas

  • Pods are internal to the cluster and can change over time.
  • To make applications reachable, Kubernetes uses services.
  • A service provides a stable endpoint that routes traffic to healthy pods.
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Exposing applications

Replicas

  • Internal services:
    • For cluster-only communication
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Exposing applications

Replicas

  • Load-balanced services (external):
    • Expose applications externally
    • Using Azure infrastructure
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Verifying application state

 

Replicas

 

  • Kubernetes provides status information for:

    • Deployments
    • Pods
    • Services

  • Helps confirm:

    • Workloads are healthy
    • Still starting up
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Recap

Kubernetes

Deploying applications on AKS is about declaring intent, not managing containers manually.

You define what should run, and Kubernetes handles how it runs - scheduling pods, restarting failures, and routing traffic.

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Let's practice!

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