85 lines
2.2 KiB
Markdown
85 lines
2.2 KiB
Markdown
---
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title: "Blue-Green Deployment"
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type: concept
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tags: [devops, deployment, release-management, high-availability]
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date: 2025-03-01
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---
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## Definition
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蓝绿部署（Blue-Green Deployment）是一种零停机发布策略，维护两套相同的生产环境（蓝环境和绿环境），通过负载均衡器切换流量实现无缝部署和快速回滚。
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## Architecture
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```
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Load Balancer
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│
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┌──────────┴──────────┐
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│ │
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Blue Env Green Env
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(Production) (Staging)
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│ │
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v1.0 v1.1 (New)
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│
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Traffic ON Traffic OFF
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```
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## Deployment Flow
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```
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1. Blue (v1.0) serving all traffic
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2. Deploy to Green (v1.1)
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3. Test/Verify Green
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4. Switch LB to Green
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5. Blue becomes standby (or update to next version)
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```
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## Key Benefits
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| 优势 | 描述 |
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|------|------|
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| 零停机 | 流量切换瞬间完成 |
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| 快速回滚 | 切换回蓝色环境即可 |
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| 测试完整性 | 完整生产环境测试 |
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| 风险可控 | 新版本未暴露给全部用户 |
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## Comparison: Blue-Green vs Canary
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| 维度 | Blue-Green | Canary |
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|------|-----------|--------|
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| 流量切换 | 全量切换 | 渐进式 |
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| 回滚速度 | 秒级 | 秒级 |
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| 资源成本 | 2x | 增量 |
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| 适用场景 | 关键系统 | 持续迭代 |
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| 风险 | 全量暴露 | 逐步暴露 |
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## In ITSM Context
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在[[ITSM 2.0]]的[[Release-Management]]中，蓝绿部署是关键实践：
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```
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Release Management 2.0
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├── Blue-Green Deployment
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│ ├── 零停机发布
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│ ├── 秒级回滚
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│ └── 全量验证
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├── Canary Release
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│ ├── 渐进式发布
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│ └── 实时监控
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└── DevOps-integrated ITSM
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├── CI/CD Pipeline
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└── Automated Governance
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```
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## Related Concepts
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- [[Release-Management]] — 发布管理总框架
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- [[Canary-Release]] — 金丝雀发布
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- [[High-Availability]] — 高可用架构
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- [[Failover]] — 故障转移
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- [[Deployment-Automation]] — 部署自动化
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## Sources
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- [[understanding-complete-itsm]] — Blue-Green在现代ITSM中的应用
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