Azure App ServiceでLinux Webアプリを公開する方法｜VM運用と比べて分かるPaaSの使いどころ

この記事のポイント

・App ServiceはOS管理不要でLinux Webアプリを公開できる
・az webapp createコマンドで数分以内にアプリが起動する
・GitHub ActionsでCI/CDパイプラインを即座に構成できる
・VM比でインフラ管理工数を大幅に削減できる

# create resource group in Japan East region
az group create   --name rg-appservice-demo   --location japaneast

{
  "id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/rg-appservice-demo",
  "location": "japaneast",
  "name": "rg-appservice-demo",
  "properties": {
    "provisioningState": "Succeeded"
  }
}

# create app service plan for linux (B1 SKU)
az appservice plan create   --name asp-demo   --resource-group rg-appservice-demo   --sku B1   --is-linux   --location japaneast

# create linux web app with Python 3.11 runtime
az webapp create   --resource-group rg-appservice-demo   --plan asp-demo   --name mylinuxwebapp-20260717   --runtime "PYTHON:3.11"

# tail app logs in real time
az webapp log tail   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717

# zip app directory (exclude .pyc and cache files)
cd /path/to/myapp
zip -r app.zip . -x "*.pyc" -x "__pycache__/*" -x ".git/*"

# deploy zip package to App Service
az webapp deployment source config-zip   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717   --src app.zip

# get publish profile and save to file
az webapp deployment list-publishing-profiles   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717   --xml   --output tsv > publish_profile.xml

name: Deploy to Azure App Service

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
      - name: Install dependencies
        run: pip install -r requirements.txt
      - name: Deploy to Azure Web App
        uses: azure/webapps-deploy@v3
        with:
          app-name: 'mylinuxwebapp-20260717'
          publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
          package: '.'

# scale up: change SKU from B1 to S1
az appservice plan update   --name asp-demo   --resource-group rg-appservice-demo   --sku S1

# create autoscale setting (min 1, max 5 instances)
az monitor autoscale create   --resource-group rg-appservice-demo   --resource asp-demo   --resource-type Microsoft.Web/serverfarms   --name autoscale-asp-demo   --min-count 1   --max-count 5   --count 2

# add scale-out rule: add 1 instance when CPU > 70% for 5 minutes
az monitor autoscale rule create   --resource-group rg-appservice-demo   --autoscale-name autoscale-asp-demo   --condition "Percentage CPU > 70 avg 5m"   --scale out 1

# check application logs for startup errors
az webapp log tail   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717

# set startup command for Python web app (gunicorn example)
az webapp config set   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717   --startup-file "gunicorn --bind=0.0.0.0 --timeout 600 app:app"

# restart app to force new deployment to take effect
az webapp restart   --resource-group rg-appservice-demo   --name mylinuxwebapp-20260717