尽管部署成功，但使用 GitHub Actions 部署到 Azure 应用服务的 Flask 应用程序仍无法访问

Question

我正在尝试使用 GitHub Actions 将一个简单的 Flask 应用程序部署到 Azure 应用服务。部署似乎成功了，从应用程序日志中可以看到Gunicorn在端口80上成功启动，没有任何错误：

这是来自 Azure 应用服务的应用程序日志

[2024-06-30 14:52:34 +0000] [80] [INFO] Starting gunicorn 22.0.0
[2024-06-30 14:52:34 +0000] [80] [INFO] Listening at: http://0.0.0.0:80 (80)
[2024-06-30 14:52:34 +0000] [80] [INFO] Using worker: sync
[2024-06-30 14:52:34 +0000] [81] [INFO] Booting worker with pid: 81
[2024-06-30 14:52:34 +0000] [82] [INFO] Booting worker with pid: 82
[2024-06-30 14:52:34 +0000] [83] [INFO] Booting worker with pid: 83
[2024-06-30 14:52:34 +0000] [84] [INFO] Booting worker with pid: 84

但是，当我尝试通过 Web 浏览器访问已部署的 Flask 应用程序时，收到“应用程序错误”错误。为了排除故障，我检查了 Azure 应用服务日志并确认 Gunicorn 正在端口 80 上运行。 我登录 ssh 并尝试重新运行 Gunicorn cmd，但我观察到 Gunicorn 已经在端口 80 上运行 SSH 日志

GitHub 操作工作流程

name: Build and deploy Python app to Azure Web App

env:
  AZURE_WEBAPP_NAME: pythonshashi  # set this to your application's name
  PYTHON_VERSION: '3.12'               # set this to the Python version to use

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python version
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Create and start virtual environment
        run: |
          python -m venv venv
          source venv/bin/activate

      - name: Set up dependency caching for faster installs
        uses: actions/cache@v3
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install dependencies
        run: pip install -r requirements.txt

      # Optional: Add a step to run tests here (PyTest, Django test suites, etc.)

      - name: Upload artifact for deployment jobs
        uses: actions/upload-artifact@v4
        with:
          name: python-app
          path: |
            .
            !venv/
  deploy:
    runs-on: ubuntu-latest
    needs: build
    environment:
      name: 'production'
      url: ${{ steps.deploy-to-webapp.outputs.webapp-url }}

    steps:
      - name: Download artifact from build job
        uses: actions/download-artifact@v4
        with:
          name: python-app
          path: .

      - name: 'Deploy to Azure Web App'
        id: deploy-to-webapp
        uses: azure/webapps-deploy@85270a1854658d167ab239bce43949edb336fa7c
        with:
          app-name: ${{ env.AZURE_WEBAPP_NAME }}
          publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}

应用程序.py

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello, World! This is my Flask application running with Gunicorn on port 80."


@app.route('/about')
def about():
    return "This is the about page."

if __name__ == '__main__':
    app.run(debug=True)

为了在部署后运行此应用程序，我添加了一个startup.sh 文件，还在应用服务配置>启动中链接此文件

启动.sh

#!/bin/bash

python3 -m pip install --upgrade pip
pip install -r requirements.txt


# Start Gunicorn server with your Flask application
gunicorn -b 0.0.0.0:80 -w 4 --timeout 600 app:app

我尝试调试它并了解到，如果我从应用服务中删除了启动配置，并且在部署后，通过 SSH 我手动运行startup.sh并且网页开始工作。

Answer 1

您遇到的错误与您的

startup.sh

文件中的配置有关。

我根据提供的代码创建了一个项目，并通过 GitHub actions 成功将其部署到 azure 应用程序服务。

当我尝试你的

startup.sh

文件时，我遇到了同样的错误， 我已将

startup.sh

更改为以下

python  -m  pip  install  --upgrade  pip
pip  install  -r  requirements.txt
gunicorn  -b  0.0.0.0:${WEBSITES_PORT:-8000} -w  4  --timeout  600  app:app

设置虚拟环境

python -m venv venv
venv\Scripts\activate

这是我的.yml 文件：

name: Build and deploy Python app to Azure Web App - sflask
on:
push:
branches:
- main
workflow_dispatch:
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Set up Python version
uses: actions/setup-python@v1
with:
python-version: '3.12'
- name: Create and start virtual environment
run: |
python -m venv venv
source venv/bin/activate
- name: Install dependencies
run: pip install -r requirements.txt
- name: Zip artifact for deployment
run: zip release.zip ./* -r
- name: Upload artifact for deployment jobs
uses: actions/upload-artifact@v3
with:
name: python-app
path: |
release.zip
!venv/
deploy:
runs-on: ubuntu-latest
needs: build
environment:
name: 'Production'
url: ${{ steps.deploy-to-webapp.outputs.webapp-url }}
steps:
- name: Download artifact from build job
uses: actions/download-artifact@v3
with:
name: python-app
- name: Unzip artifact for deployment
run: unzip release.zip
- name: 'Deploy to Azure Web App'
uses: azure/webapps-deploy@v2
id: deploy-to-webapp
with:
app-name: 'sflask'
slot-name: 'Production'
publish-profile: ${{ secrets.AZUREAPPSERVICE_PUBLISHPROFILE_28F2816178DA40D480C0843A3F17B173 }}

在将应用程序部署到 Azure 应用服务之前，请确保在项目的根目录中运行此命令。

pip freeze > requirements.txt

我已通过 Github 成功部署了该应用程序。

这是部署后的输出：

我不知道这是否是App服务的正常行为。

在 Flask 应用程序中，指定启动命令很重要。如果您决定包含启动命令，可以将其写入项目中的

startup.sh

文件中，也可以直接在 Azure 应用服务设置的启动命令中进行配置。”