我已经在localhost:57475/metrics
上启动了Prometheus服务器:
使用以下Go代码:
package main
import (
"net/http"
"contrib.go.opencensus.io/exporter/prometheus"
log "github.com/sirupsen/logrus"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/stats/view"
)
func main() {
stop := make(chan struct{})
server := &http.Server{Addr: ":8080"}
statsMux := http.NewServeMux()
statsServer := &http.Server{Handler: statsMux,Addr: ":57475"}
if err := view.Register(ochttp.DefaultServerViews...); err != nil {
log.WithError(err).Fatal("register HTTP metrics view")
}
exporter,err := prometheus.NewExporter(prometheus.Options{
Namespace: "default",})
if err != nil {
log.WithError(err).Fatal("create Prometheus exporter")
}
view.RegisterExporter(exporter)
statsMux.Handle("/metrics",exporter)
originalHandler := http.HandlerFunc(func(w http.ResponseWriter,r *http.Request) {
w.Write([]byte("Hello,World!"))
})
och := &ochttp.Handler{
Handler: originalHandler,}
server.Handler = och
go func() {
log.Info("Starting stats server...")
if err := statsServer.ListenAndServe(); err != nil {
log.WithError(err).Fatal("listen and serve stats")
}
}()
go func() {
log.Info("Starting server...")
if err := server.ListenAndServe(); err != nil {
log.WithError(err).Fatal("listen and serve service endpoints")
}
}()
<-stop
}
我还使用以下命令(遵循https://grafana.com/docs/installation/docker/)在容器中启动了Grafana:
> docker run --detach --publish 3000:3000 --env "GF_SECURITY_ADMIN_PASSWORD=secret" grafana/grafana
2a17ad2bcc05e2955190129b981b3329cd2c5e89098e28b443337ac79ed607f2
在Grafana中,我想连接到在Mac localhost
上运行的Prometheus导出器。在https://docs.docker.com/docker-for-mac/networking/之后,我尝试使用特殊的DNS名称host.docker.internal
,因此将URL指定为http://host.docker.internal:57475/metrics
。但是,当我单击“保存并测试”时,结果为HTTP Error Not Found
:
知道为什么这不起作用吗?
更新
我没有使用特殊的DNS名称host.docker.internal
,而是尝试将服务器和Grafana组合到Docker Compose多容器应用程序中,并使用Docker桥将它们连接起来,但这还是行不通的。使用以下目录结构:
.
├── docker-compose.yml
└── server
├── Dockerfile
├── go.mod
├── go.sum
└── main.go
和以下docker-compose.yml
:
version: '3'
services:
server:
build: ./server
ports:
- "8080:8080"
- "57475:57475"
grafana:
image: grafana/grafana
ports:
- "3000:3000"
和以下Dockerfile
:
FROM golang:1.12
WORKDIR /go/src/app
COPY . .
RUN go get -d -v ./...
RUN go install -v ./...
CMD ["app"]
如果我连接到Grafana容器并卷曲server:8080
或server:57475/metrics
,则会收到响应:
useprometheus> docker exec -it --user root useprometheus_grafana_1 /bin/ash
/usr/share/grafana # apk add curl
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
(1/3) Installing nghttp2-libs (1.39.2-r0)
(2/3) Installing libcurl (7.66.0-r0)
(3/3) Installing curl (7.66.0-r0)
Executing busybox-1.30.1-r2.trigger
OK: 17 MiB in 24 packages
/usr/share/grafana # curl server:8080
Hello,World!/usr/share/grafana # curl server:57475/metrics
# HELP default_opencensus_io_http_server_latency Latency distribution of HTTP requests
# TYPE default_opencensus_io_http_server_latency histogram
default_opencensus_io_http_server_latency_bucket{le="1"} 1
default_opencensus_io_http_server_latency_bucket{le="2"} 1
default_opencensus_io_http_server_latency_bucket{le="3"} 1
default_opencensus_io_http_server_latency_bucket{le="4"} 1
但是,如果我尝试在Grafana管理员中添加相同的URL,则会出现相同的错误:
换句话说,尽管我可以从Grafana容器中curl
来使用此端点,但是我不能将其用作Grafana仪表板中的数据源URL,这使我认为这是Grafana所特有的。知道为什么这行不通吗?