APM Go 代理未向 APM 服务器发送数据

Question

我有一个 Elastic APM-Server 启动并运行，它已成功建立与 Elasticsearch 的连接。然后我安装了一个 Elastic APM Go 代理：go get -u go.elastic.co/apm它返回以下内容：finding go.elastic.co/apm v1.8.0finding github.com/stretchr/testify v1.4.0finding github.com/prometheus/procfs v0.0.3finding github.com/google/go-cmp v0.3.1finding github.com/armon/go-radix v1.0.0finding github.com/santhosh-tekuri/jsonschema v1.2.4finding github.com/cucumber/godog v0.8.1finding golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2efinding go.elastic.co/fastjson v1.0.0finding github.com/google/go-cmp v0.5.1finding github.com/prometheus/procfs v0.1.3finding golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6efinding golang.org/x/sys latestfinding github.com/elastic/go-sysinfo v1.1.1finding golang.org/x/sync latestfinding golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98efinding github.com/stretchr/testify v1.6.1finding go.elastic.co/fastjson v1.1.0finding github.com/cucumber/godog v0.10.0finding github.com/stretchr/objx v0.3.0finding github.com/elastic/go-sysinfo v1.4.0finding gopkg.in/yaml.v2 v2.2.2finding github.com/joeshaw/multierror v0.0.0-20140124173710-69b34d4ec901finding golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543finding github.com/prometheus/procfs v0.0.0-20190425082905-87a4384529e0finding github.com/elastic/go-windows v1.0.0finding golang.org/x/sys v0.0.0-20191025021431-6c3a3bfe00ae然后我设置ELASTIC_APM_SERVER_URLand ELASTIC_APM_SERVICE_NAME：export ELASTIC_APM_SERVER_URL=http://my-apm-server-urlexport ELASTIC_APM_SERVICE_NAME=agent-name但是，我没有看到代理在 APM 仪表板中注册。它不会向 APM 服务器发送任何数据。如何确保代理正在运行？如何检查代理日志以了解为什么它无法连接到 APM 服务器？

Answer 1

既然您没有在上面提到它：您是否检测了 Go 应用程序？Elastic APM Go“代理”是一个用于检测应用程序源代码的包。它不是一个独立的进程，而是在您的应用程序中运行。

因此，首先（如果您还没有）检测您的应用程序。请参阅https://www.elastic.co/guide/en/apm/agent/go/current/getting-started.html#instrumenting-source

这是一个使用Echo和apmechov4检测模块的示例 Web 服务器：

package main

import (

        "fmt"

        "net/http"

        echo "github.com/labstack/echo/v4"

        "go.elastic.co/apm/module/apmechov4"

)

func main() {

        e := echo.New()

        e.Use(apmechov4.Middleware())

        e.GET("/hello/:name", func(c echo.Context) error {

                fmt.Println(c.Param("name"))

                return nil

        })

        http.ListenAndServe(":8080", e)

}

如果您运行它并向 发送一些请求http://localhost:8080/hello/world，您应该很快就会在 Kibana 的 APM 应用程序中看到请求。

如果您在 Kibana 中仍然看不到任何内容，可以按照https://www.elastic.co/guide/en/apm/agent/go/current/troubleshooting.html#agent-logging启用日志记录。如果代理能够成功地将数据发送到服务器，您可以看到以下内容：

$ ELASTIC_APM_LOG_FILE=stderr ELASTIC_APM_LOG_LEVEL=debug go run main.go

{"level":"debug","time":"2020-08-19T13:33:28+08:00","message":"sent request with 3 transactions, 0 spans, 0 errors, 0 metricsets"}

{"level":"debug","time":"2020-08-19T13:33:46+08:00","message":"gathering metrics"}

{"level":"debug","time":"2020-08-19T13:33:56+08:00","message":"sent request with 0 transactions, 0 spans, 0 errors, 3 metricsets"}

另一方面，如果服务器无法访问，您会看到如下内容：

{"level":"error","time":"2020-08-19T13:38:01+08:00","message":"config request failed: sending config request failed: Get \"http://localhost:8200/config/v1/agents?service.name=main\": dial tcp 127.0.0.1:8200: connect: connection refused"}