fix bug image of example-log-receiver can not run

Signed-off-by: wanjunlei <[email protected]>

Author: wanjunlei

docs/user-guides/forwarding-logs-via-http/Dockerfile

@@ -1,6 +1,16 @@
-FROM golang:1.14-stretch
+# Build the manager binary
+FROM golang:1.14 as builder
 
+WORKDIR /
 COPY main.go /go/src/main.go
-RUN go build /go/src/main.go
+RUN CGO_ENABLED=0 go build /go/src/main.go
+
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:nonroot
+WORKDIR /
+COPY --from=builder /main .
+USER nonroot:nonroot
+
+ENTRYPOINT ["/main"]
 
-CMD ["/main"]

docs/user-guides/forwarding-logs-via-http/README.md

@@ -7,7 +7,7 @@ This tutorial guides you on how to filter error logs and send them out via HTTP.
 First, deploy HTTP sample server for receiving logs (see main.go).
 
 ```shell
-kubectl create deploy log-receiver --image=kubespheredev/example-log-receiver --port=8080
+kubectl create deploy log-receiver --image=kubespheredev/example-log-receiver
 kubectl expose deploy log-receiver --port=8080 --target-port=8080
 ```  
 Second, setup the logging pipeline. It deploys a log generator and logging agents (fluent bit). The logging agent will forward all error logs containing `ERRO` to the sample server above.