Istio：灰度发布与技术实现

清疚 2023-07-01 04:23 22阅读 0赞

# 大纲 #

> 1.  典型发布类型对比
> 2.  Istio流量治理技术解析
> 3.  智能灰度发布介绍
> 4.  灰度发布功能展示

# 典型发布类型对比 #

> 1.  蓝绿发布
> 2.  灰度发布（金丝雀发布）
> 3.  A/B Test
> 
> 可参考：[K8s 应用管理之道 - 升级篇（二） https://blog.csdn.net/fly910905/article/details/99696319][K8s _ - _https_blog.csdn.net_fly910905_article_details_99696319]

## 蓝绿发布 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70][]

## 灰度发布（金丝雀发布） ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 1][]

## A/B Test ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 2][]

>  *  A/B Test主要对特定用户采样后，对收集到的反馈数据做相关对比，然后根据比对结果作出决策。
>  *  用来测试应用功能表现的方法，侧重应用的**可用性，受欢迎程度**等。

# Istio流量治理技术解析 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 3][] Istio流量管理

## 配置规则 ##

> 1.  **VirtualService** 在 Istio 服务网格中定义路由规则，控制路由如何路由到服务上。
> 2.  **DestinationRule** 是 VirtualService 路由生效后，配置应用与请求的策略集。
> 3.  **ServiceEntry** 是通常用于在 Istio 服务网格之外启用对服务的请求。
> 4.  **Gateway** 为 HTTP/TCP 流量配置负载均衡器，最常见的是在网格的边缘的操作，以启用应用程序的入口流量。

### **DestinationRule** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 4][]

### **VirtualService** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 5][]

### 基于权重的路由     ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 6][]

### 基于请求内容的路由 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 7][]

### 复杂灰度场景下的VirtualService  ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 8][]

# 智能灰度发布介绍 #

> 智能灰度发布，相当于无人值守

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 9][]

## 灰度发布流程 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 10][]

## 智能灰度发布 ##

> **目标**：细粒度控制的自动化的持续交付
> 
> **特点**：
> 
> 1.  用户细分
> 2.  流量管理
> 3.  关键指标可观测
> 4.  发布流程自动化

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 11][]

## 自适应灰度发布参数 ##

>  *  负载健康状态
>  *  请求成功率 
>  *  平均请求时延
>  *  流量权重步长
>  *  回滚门限值

## 监控指标 ##

> **RED**
> 
>  *  **(Request) Rate** \- the number of requests, per second, your services are serving.
>  *  **(Request) Errors** \- the number of failed requests per second.
>  *  **(Request) Duration** \- The amount of time each request takes expressed as a time interval
> 
>   
> **USE（ utilization， saturation， errors）**
> 
>  *  **CPUs:** sockets, cores, hardware threads (virtual CPUs)
>  *  **Memory:** capacity
>  *  **Network interfaces**
>  *  **Storage devices:** I/O, capacity
>  *  **Controllers:** storage, network cards
>  *  **Interconnects:** CPUs, memory, I/O

## flagger ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 12][] flagger

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZseTkxMDkwNQ_size_16_color_FFFFFF_t_70 13][] kubectl -n test describe canary/podinfo

### 相关链接 ###

>  *  https://support.huaweicloud.com/usermanual-cce/cce\_01\_0050.html
>  *  https://bbs.huaweicloud.com/videos/e4927c347e4a41da82feb9c8c0bf6b30
>  *  https://github.com/stefanprodan/flagger
>  *  https://github.com/magneticio/vamp2setup/blob/master/BASIC\_TUTORIAL.md
>  *  https://github.com/intuit/wasabi

[K8s _ - _https_blog.csdn.net_fly910905_article_details_99696319]: https://blog.csdn.net/fly910905/article/details/99696319
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