75 lines
2.2 KiB
Markdown
75 lines
2.2 KiB
Markdown
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openfeign依据consul中的服务找到对应的pod的ip：port。蓝绿怎么做？
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```mermaid
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flowchart TD
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subgraph Client Side
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A[Spring Boot App with OpenFeign] -->|Call my-service| B[Spring Cloud LoadBalancer]
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end
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subgraph Consul
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B -->|Query my-service instances| C[Consul Service Discovery]
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C -->|Return instances with tags/meta| D[Instance List with version info]
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end
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subgraph K8s Cluster
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D -->|Filter version=blue/green| E[Service Selector / LoadBalancer]
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subgraph Blue Deployment
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E --> F[Pod Blue 1]
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E --> G[Pod Blue 2]
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end
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subgraph Green Deployment
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E --> H[Pod Green 1]
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E --> I[Pod Green 2]
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end
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end
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%% Optional: Gateway / Ingress for traffic control
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subgraph Gateway/Ingress Layer
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J[Ingress / Service Mesh] -.-> E
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J -->|Route 90% blue, 10% green| F
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J -->|Route 90% blue, 10% green| H
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end
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```
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❓ 蓝系统weight 0，绿系统100%，但蓝系统的kafka还在消费，topic被蓝系统消费掉了，会不会产生问题？
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没有问题。如果蓝绿规划为同一消费者组，并且消费是密等的，被谁消费掉无所谓。
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💡 最佳实践：
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1. 蓝绿切换时，不仅切换 HTTP 流量，还要 优雅下线旧版本 Kafka 消费器
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2. 消费逻辑保持幂等，避免蓝绿切换引发重复处理
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redis: 共享 Redis + 蓝绿系统写入隔离
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mysql:
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```mermaid
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flowchart TD
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subgraph Client Side
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A[HTTP Request] -->|flow 0 percent| B[Blue System (old version)]
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A -->|flow 100 percent| C[Green System (new version)]
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end
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subgraph MySQL Cluster
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D[(MySQL Primary / Cluster)]
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end
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%% Blue system behavior
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B -->|finish old transactions| D
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B -->|use old schema fields| D
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%% Green system behavior
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C -->|handle new requests| D
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C -->|use new schema fields| D
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%% Notes
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subgraph Notes
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N1[Blue system flow 0 but finishes old transactions to ensure data consistency]
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N2[Blue/Green share MySQL, schema must be backward compatible]
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N3[Write operations should be idempotent to avoid conflicts]
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end
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```
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