使用 Azure DevOps 部署后出现 Python 应用程序问题

Question

在使用 Azure DevOps 管道将 Python 应用程序部署到 Azure 应用服务时遇到问题。

尝试了 Docker 映像和 zip 部署，但导致了相同的错误。

应用程序服务计划是Linux。部署成功，但我在浏览器中收到网关超时“504.0 Gateway Timeout”。

网关错误：

Python 应用程序在本地运行良好，我可以使用 VS Code 发布到 Azure 应用服务。

通过添加 WEBSITES_PORT 键更新了应用程序设置，并尝试使用 8000、8080 和 5000 端口号，但没有成功。

来自日志流的日志：

这是 docker 文件：

Answer 1

根据到目前为止的描述，当我的应用程序容器无法运行/启动时，我只能重现类似的问题。可能有许多不同的错误导致容器启动失败，而管道运行可能会成功，因为它只是设置配置但没有等待容器启动。

您可以利用应用程序高级工具检查容器日志并找出实际错误。

这是我根据本文档中的简单演示更新的示例，以及我的 YAML 管道定义，供您参考。

更新了 Dockerfile

# Pull a pre-built alpine docker image with nginx and python3 installed
FROM tiangolo/uwsgi-nginx:python3.8-alpine-2020-12-19

# Set the port on which the app runs; make both values the same.
#
# IMPORTANT: When deploying to Azure App Service, go to the App Service on the Azure 
# portal, navigate to the Applications Settings blade, and create a setting named
# WEBSITES_PORT with a value that matches the port here (the Azure default is 80).
# You can also create a setting through the App Service Extension in VS Code.
ENV LISTEN_PORT=5000
EXPOSE 5000

# Indicate where uwsgi.ini lives
ENV UWSGI_INI uwsgi.ini

# Tell nginx where static files live. Typically, developers place static files for
# multiple apps in a shared folder, but for the purposes here we can use the one
# app's folder. Note that when multiple apps share a folder, you should create subfolders
# with the same name as the app underneath "static" so there aren't any collisions
# when all those static files are collected together.
ENV STATIC_URL /hello_app/static

# Set the folder where uwsgi looks for the app
WORKDIR /hello_app

# Copy the app contents to the image
COPY . /hello_app

# If you have additional requirements beyond Flask (which is included in the
# base image), generate a requirements.txt file with pip freeze and uncomment
# the next three lines.
COPY requirements.txt /
RUN pip install --no-cache-dir -U pip
RUN pip install --no-cache-dir -r /requirements.txt

azure-pipelines.yml

trigger:
- none

pool:
  vmImage: ubuntu-latest

variables:
  # ACR
  dockerRegistryServiceConnection: 'ACRSvcCnnWIF'
  imageRepository: 'containerapp/python/flask'
  containerRegistry: 'azacrxxxxxx.azurecr.io'
  dockerfilePath: '$(Build.SourcesDirectory)/Dockerfile'
  tag: $(Build.BuildId)

  # Azure Web App for container
  ARMSvcCnn: ARMSvcCnnWIFAutoSub1
  webAppName: azwebapp-xxxxxx-python-container

stages:
- stage: CI_BuildPushACRImage
  jobs:
  - job: BuildPushACRImage
    displayName: Build
    steps:
    - task: Docker@2
      displayName: Build and push an image to Azure Container Registry
      inputs:
        command: buildAndPush
        repository: $(imageRepository)
        dockerfile: $(dockerfilePath)
        containerRegistry: $(dockerRegistryServiceConnection)
        tags: |
          $(tag)

- stage: CD_DeployAzureWebAppContainer
  dependsOn: CI_BuildPushACRImage
  jobs:
  - deployment: DeployAzureWebAppContainer
    environment: E-AzureWebAppContainer
    strategy:
      runOnce:
        deploy:
          steps:
          - task: AzureWebAppContainer@1
            inputs:
              azureSubscription: '$(ARMSvcCnn)'
              appName: '$(webAppName)'
              containers: '$(containerRegistry)/$(imageRepository):$(tag)'
              appSettings: >
                -DOCKER_REGISTRY_SERVER_PASSWORD $(DOCKER_REGISTRY_SERVER_PASSWORD)
                -DOCKER_REGISTRY_SERVER_USERNAME $(DOCKER_REGISTRY_SERVER_USERNAME)
                -DOCKER_REGISTRY_SERVER_URL https://$(containerRegistry)
                -WEBSITES_PORT 5000