Understanding Containers in Azure

Containers package an application and all its dependencies into a single, lightweight unit that runs consistently across environments. Azure offers several services to build, deploy, and manage containerized applications.

Why Use Containers?

• Consistent behavior across development, testing, and production environments
• Faster startup times compared to full virtual machines
• Efficient use of resources, since containers share the host operating system kernel
• Easier to scale individual pieces of an application independently

Key Azure Container Services

• Azure Container Instances (ACI) — run containers directly without managing any underlying VMs or orchestration
• Azure Kubernetes Service (AKS) — a managed Kubernetes service for orchestrating containers at scale
• Azure Container Apps — a serverless platform for running microservices and containerized apps without managing infrastructure
• Azure Container Registry (ACR) — a private registry for storing and managing container images

Basic Example: Running a Container with ACI

az container create \
  --resource-group myResourceGroup \
  --name mycontainer \
  --image mcr.microsoft.com/azuredocs/aci-helloworld \
  --dns-name-label myapp \
  --ports 80

Choosing the Right Container Service

• Use ACI for simple, short-lived, or single-container workloads
• Use AKS when you need full control over orchestration, scaling, and networking at scale
• Use Azure Container Apps for microservices that need scaling and event-driven triggers without managing Kubernetes directly