Update app.py
Some checks failed
continuous-integration/drone/push Build encountered an error

This commit is contained in:
2025-12-17 08:51:11 +08:00
commit 2bf72e1feb
5 changed files with 301 additions and 0 deletions

70
.drone.yml Normal file
View File

@@ -0,0 +1,70 @@
kind: pipeline
type: docker
name: build-by-tag
node:
name: pve
trigger:
event:
- tag
ref:
- refs/tags/v*
steps:
- name: build-and-push
image: docker:dind
volumes:
- name: dockersock
path: /var/run/docker.sock
environment:
REGISTRY: harbor.seahi.me
IMAGE_NAME: stu/versions-for-swarm
HARBOR_USERNAME:
from_secret: harbor_username
HARBOR_PASSWORD:
from_secret: harbor_password
commands:
# 登录 Harbor
- echo $HARBOR_PASSWORD | docker login $REGISTRY -u $HARBOR_USERNAME --password-stdin
# 从 Git Tag 获取版本号
- export VERSION=${DRONE_TAG}
- echo "📦 构建版本: $VERSION"
# 判断是否为 buggy 版本
- |
if echo "$VERSION" | grep -q "buggy"; then
BUGGY_FLAG="--build-arg BUGGY=true"
echo "⚠️ 检测到 buggy 版本,启用故障模式"
else
BUGGY_FLAG=""
fi
# 构建镜像
- docker build
--build-arg APP_VERSION=$VERSION
$BUGGY_FLAG
-t $REGISTRY/$IMAGE_NAME:$VERSION
.
# 如果是 v2.1,同时标记为 latest
- |
if [ "$VERSION" = "v2.1" ]; then
docker tag $REGISTRY/$IMAGE_NAME:$VERSION $REGISTRY/$IMAGE_NAME:latest
docker push $REGISTRY/$IMAGE_NAME:latest
echo "🏷️ 已标记为 latest"
fi
# 推送镜像
- docker push $REGISTRY/$IMAGE_NAME:$VERSION
# 清理
- docker system prune -f
- echo "✅ 版本 $VERSION 构建并推送成功!"
volumes:
- name: dockersock
host:
path: /var/run/docker.sock

30
Dockerfile Normal file
View File

@@ -0,0 +1,30 @@
FROM python:3.9-alpine
# 构建参数
ARG APP_VERSION=v1.0
ARG BUGGY=false
# 设置时区
RUN apk add --no-cache tzdata && \
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
echo "Asia/Shanghai" > /etc/timezone && \
apk del tzdata
ENV TZ=Asia/Shanghai \
APP_VERSION=${APP_VERSION} \
BUGGY=${BUGGY}
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY app.py .
EXPOSE 80
# 添加健康检查v2.0+ 特性)
HEALTHCHECK --interval=10s --timeout=3s --start-period=5s --retries=3 \
CMD wget --no-verbose --tries=1 --spider http://localhost/health || exit 1
CMD ["python", "app.py"]

37
README.md Normal file
View File

@@ -0,0 +1,37 @@
# Docker Swarm 版本管理演示项目
> 🎓 专为 Docker Swarm 滚动更新与回滚教学设计的多版本应用
[![Build Status](https://drone.seahi.me/api/badges/Teaching/versions-for-swarm/status.svg)](https://drone.seahi.me/Teaching/versions-for-swarm)
## 📋 项目简介
这是一个用于演示 Docker Swarm 滚动更新、回滚和版本管理的教学项目。通过**视觉化的版本差异**(不同颜色主题),学生可以直观地观察到:
- ✅ 滚动更新过程中的零停机部署
- ✅ 多副本逐步替换的过程
- ✅ 故障版本的自动/手动回滚
- ✅ CI/CD 自动构建多版本镜像
## 🎨 版本说明
| 版本 | 主题颜色 | 特性 | 用途 |
|------|---------|------|------|
| **v1.0** | 🔵 蓝色 | 基础功能 | 初始部署演示 |
| **v2.0** | 🟢 绿色 | 新增健康检查、API接口 | 正常升级演示 |
| **v2.1** | 🟢 绿色 | 性能优化、Bug修复 | 稳定版本 |
| **v3.0-buggy** | 🔴 红色 | ⚠️ 50%概率返回500错误 | 回滚场景演示 |
## 🚀 快速开始
### 1⃣ 部署初始版本 (v1.0)
```bash
docker service create \
--replicas 3 \
--name demo-app \
--publish 9000:80 \
--env STUDENT_ID=00 \
--update-delay 10s \
--update-parallelism 1 \
harbor.seahi.me/stu/versions-for-swarm:v1.0

139
app.py Normal file
View File

@@ -0,0 +1,139 @@
from flask import Flask, jsonify
import socket
import os
from datetime import datetime
import random
app = Flask(__name__)
# 从环境变量读取版本号
VERSION = os.getenv('APP_VERSION', 'v1.0')
BUGGY = os.getenv('BUGGY', 'false').lower() == 'true'
# 版本主题配置
THEMES = {
'v1.0': {'color': '#4A90E2', 'name': '蓝色经典版', 'features': '基础功能'},
'v2.0': {'color': '#50C878', 'name': '绿色升级版', 'features': '新增健康检查、API接口'},
'v2.1': {'color': '#50C878', 'name': '绿色稳定版', 'features': '性能优化、Bug修复'},
'v3.0-buggy': {'color': '#E74C3C', 'name': '红色测试版', 'features': '⚠️ 此版本存在已知问题'}
}
@app.route('/')
def hello():
# 模拟 v3.0-buggy 的问题
if BUGGY and random.random() < 0.5:
return "💥 服务异常:数据库连接失败", 500
theme = THEMES.get(VERSION, THEMES['v1.0'])
return f"""
<!DOCTYPE html>
<html>
<head>
<title>Docker Swarm 滚动更新演示</title>
<meta charset="utf-8">
<meta http-equiv="refresh" content="3">
<style>
body {{
font-family: Arial;
max-width: 700px;
margin: 50px auto;
padding: 30px;
background: linear-gradient(135deg, {theme['color']}22 0%, {theme['color']}44 100%);
}}
.header {{
background: {theme['color']};
color: white;
padding: 20px;
border-radius: 10px 10px 0 0;
text-align: center;
}}
.info {{
background: white;
padding: 20px;
border-radius: 0 0 10px 10px;
box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}}
.highlight {{
color: {theme['color']};
font-weight: bold;
font-size: 1.2em;
}}
.version-badge {{
display: inline-block;
background: {theme['color']};
color: white;
padding: 5px 15px;
border-radius: 20px;
font-size: 0.9em;
margin-top: 10px;
}}
table {{
width: 100%;
border-collapse: collapse;
margin-top: 15px;
}}
td {{
padding: 10px;
border-bottom: 1px solid #eee;
}}
td:first-child {{
color: #666;
width: 40%;
}}
.auto-refresh {{
color: #999;
font-size: 0.85em;
text-align: center;
margin-top: 15px;
}}
</style>
</head>
<body>
<div class="header">
<h1>🚀 {theme['name']}</h1>
<div class="version-badge">版本 {VERSION}</div>
</div>
<div class="info">
<table>
<tr>
<td>📦 容器主机名</td>
<td class="highlight">{socket.gethostname()}</td>
</tr>
<tr>
<td>🎓 学号服务</td>
<td class="highlight">s{os.getenv('STUDENT_ID', '00')}</td>
</tr>
<tr>
<td>⏰ 当前时间</td>
<td class="highlight">{datetime.now().strftime('%Y-%m-%d %H:%M:%S')}</td>
</tr>
<tr>
<td>✨ 版本特性</td>
<td class="highlight">{theme['features']}</td>
</tr>
</table>
<div class="auto-refresh">🔄 页面每3秒自动刷新观察容器变化</div>
</div>
</body>
</html>
"""
@app.route('/api/version')
def version():
return jsonify({
'version': VERSION,
'hostname': socket.gethostname(),
'student_id': os.getenv('STUDENT_ID', '00'),
'timestamp': datetime.now().isoformat(),
'buggy': BUGGY
})
@app.route('/health')
def health():
if BUGGY and random.random() < 0.3:
return {'status': 'unhealthy'}, 503
return {'status': 'healthy', 'version': VERSION}, 200
if __name__ == '__main__':
app.run(host='0.0.0.0', port=80)

25
build.sh Normal file
View File

@@ -0,0 +1,25 @@
#!/bin/bash
REGISTRY="harbor.seahi.me/stu"
IMAGE_NAME="whoami-for-swarm"
# 构建 v1.0
docker build --build-arg APP_VERSION=v1.0 \
-t ${REGISTRY}/${IMAGE_NAME}:v1.0 .
docker push ${REGISTRY}/${IMAGE_NAME}:v1.0
# 构建 v2.0
docker build --build-arg APP_VERSION=v2.0 \
-t ${REGISTRY}/${IMAGE_NAME}:v2.0 .
docker push ${REGISTRY}/${IMAGE_NAME}:v2.0
# 构建 v2.1
docker build --build-arg APP_VERSION=v2.1 \
-t ${REGISTRY}/${IMAGE_NAME}:v2.1 .
docker push ${REGISTRY}/${IMAGE_NAME}:v2.1
# 构建 v3.0-buggy有问题的版本
docker build --build-arg APP_VERSION=v3.0-buggy --build-arg BUGGY=true \
-t ${REGISTRY}/${IMAGE_NAME}:v3.0-buggy .
docker push ${REGISTRY}/${IMAGE_NAME}:v3.0-buggy
echo "✅ 所有版本构建完成!"