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CloudNative/Kubernetes/Istio/基础知识.md Normal file
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#### 原生service方案
负载均衡，缺乏熔断、限流、灰度
#### service mesh（istio）
pod中运行一个从container叫做istio-proxy
a、从其他container发送的流量会被pod中的iptables拦截给istio-proxy进程
b、istio进程，解析http的请求，获取Header的host字段
c、istio-proxy了解到host应该转发给那些pod，直接把流量转发给随机目标pod
#### 原生service方案
源pod -> service(ip) -> 目标pod
#### service mesh（istio）
源pod -> 解析service ip -> iptables redirect流量拦截 -> istio proxy -> pod
#### istio怎么到pod中
1、修改deployment yaml，把istio-proxy container、init container配置进去
通过istio-injector命令行修改yaml
2、istio通过webhook自动修改yaml