集成SkyWalking实现调用链追踪

1. SkyWalking架构图

Receiver是SkyWalking的入口，支持gRPC和HTTP协议。
SkyWalking内部有分析和查询两个部分
存储方面SkyWalking支持Elasticsearch和MySql，H2等数据库

2. 代码集成SkyWalking

• 包引用：SkyAPM.Agent.AspNetCore/SkyAPM.Transport.Grpc/SkyAPM.Transport.Grpc.Protocol
• 应用程序根目录放置skyapm.json文件
• 程序环境变量中添加如下代码，

“ASPNETCORE_HOSTINGSTARTUPASSEMBLIES”: “SkyAPM.Agent.AspNetCore”

• 部署文件添加环境变量,服务地址

skywalking_hostingStartup=SkyAPM.Agent.AspNetCore
skywalking_servers=172.16.190.168:11800

• deployment.yaml中定义环境变量,读取上述环境标量的值

skyapm.json

{"SkyWalking": {"ServiceName": "ordering-api","Namespace": "","HeaderVersions": ["sw6"],"Sampling": {"SamplePer3Secs": -1,"Percentage": -1.0},"Logging": {"Level": "Information","FilePath": "logs\\skyapm-{Date}.log"},"Transport": {"Interval": 3000,"ProtocolVersion": "v6","QueueSize": 30000,"BatchSize": 3000,"gRPC": {"Servers": "localhost:11800","Timeout": 10000,"ConnectTimeout": 10000,"ReportTimeout": 600000}}}
}

默认情况下SkyWalking使用的是本地内存数据库,重启会丢失数据，线上环境建议使用Elasticsearch存储