azure

name	azure
description	Azure — Container Apps, AKS, ACR, Azure SQL, Cosmos DB, managed identity.

Azure Deployment

Core Principle: Managed Identity Over Credentials

Azure's Managed Identity eliminates the need to store credentials — always use it over connection strings with passwords where possible.

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Recommended Stack

Azure DNS → Azure Front Door / App Gateway → Container Apps → Azure SQL / Cosmos DB
                                                           → Azure Cache for Redis
                                                           → Blob Storage (assets)

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Azure Container Registry (ACR)

# Login
az acr login --name myregistry

# Build and push
docker build -t myregistry.azurecr.io/myapp:$GIT_SHA .
docker push myregistry.azurecr.io/myapp:$GIT_SHA

# Enable auto-purge of untagged images
az acr config retention update \
  --registry myregistry \
  --status enabled \
  --days 30 \
  --type UntaggedManifests

Azure Container Apps — Recommended Entry Point

# Create environment
az containerapp env create \
  --name myapp-env \
  --resource-group myapp-rg \
  --location eastus

# Deploy app
az containerapp create \
  --name myapp \
  --resource-group myapp-rg \
  --environment myapp-env \
  --image myregistry.azurecr.io/myapp:$GIT_SHA \
  --registry-server myregistry.azurecr.io \
  --target-port 8000 \
  --ingress external \
  --min-replicas 0 \
  --max-replicas 10 \
  --cpu 0.5 \
  --memory 1Gi \
  --env-vars APP_ENV=production \
  --secrets "db-password=secretref:myapp-db-password"

# Update to new image
az containerapp update \
  --name myapp \
  --resource-group myapp-rg \
  --image myregistry.azurecr.io/myapp:$NEW_SHA

Key Vault — Secrets Management

# Create Key Vault
az keyvault create \
  --name myapp-kv \
  --resource-group myapp-rg \
  --location eastus

# Store secret
az keyvault secret set \
  --vault-name myapp-kv \
  --name db-password \
  --value "supersecret"

# Grant Container App access via Managed Identity
az keyvault set-policy \
  --name myapp-kv \
  --object-id <MANAGED_IDENTITY_OBJECT_ID> \
  --secret-permissions get list

Managed Identity

# Enable system-assigned identity on Container App
az containerapp identity assign \
  --name myapp \
  --resource-group myapp-rg \
  --system-assigned

# Grant ACR pull access
az role assignment create \
  --assignee <PRINCIPAL_ID> \
  --role AcrPull \
  --scope /subscriptions/SUB/resourceGroups/RG/providers/Microsoft.ContainerRegistry/registries/myregistry

Rule: Never use ACR admin credentials — use Managed Identity for AKS/Container Apps pulling from ACR.

GitHub Actions Integration

- name: Login to Azure
  uses: azure/login@v2
  with:
    client-id: ${{ secrets.AZURE_CLIENT_ID }}
    tenant-id: ${{ secrets.AZURE_TENANT_ID }}
    subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}

- name: Deploy to Container Apps
  run: |
    az containerapp update \
      --name myapp \
      --resource-group myapp-rg \
      --image myregistry.azurecr.io/myapp:${{ github.sha }}

Use Federated Identity (OIDC) instead of client secrets for GitHub Actions — no secret rotation needed.

Cost Optimization

• Container Apps scale to zero — no idle cost for dev/staging
• Use Spot instances for non-critical workloads (up to 90% discount)
• Use Azure SQL serverless tier for dev databases — pauses when idle
• Set Budget alerts in Cost Management at 80% and 100% of monthly budget
• Use Azure Reservations for 1-3 year commitments on predictable compute (up to 72% off)
• Enable Azure Advisor — it actively recommends cost-saving actions

Useful Commands

# Stream Container App logs
az containerapp logs show --name myapp --resource-group myapp-rg --follow

# List revisions
az containerapp revision list --name myapp --resource-group myapp-rg

# Rollback
az containerapp revision activate \
  --revision myapp--previous-revision-name \
  --name myapp --resource-group myapp-rg
az containerapp ingress traffic set \
  --name myapp --resource-group myapp-rg \
  --revision-weight myapp--previous-revision-name=100

# Check costs
az consumption usage list --start-date 2024-01-01 --end-date 2024-01-31