为 go 应用程序的 EKS 集群中的 Kube.netes pod 设置调试器

Question

I am trying to set up a debugger for my application which is running inside my Kube.netes pod in the EKS cluster.

I have one through many articles but they all talk about setting up a debugger for local env.

I am using helm charts and EKS for the Kube.netes cluster. Please help me with this problem.

I tried Dockerfile changes to install delve but CMD and ENTRYPOINT command both are failing with

exec: "go": executable file not found in $PATH

My docker file looks like

Stage 1: Compile the Golang application

FROM golang:1.18-alpine AS builder

WORKDIR /application
COPY . /application
RUN GOOS=linux GOARCH=amd64 go build -v -x -o app --ldflags '-extldflags "-static"'

Stage 2: Move only the compiled code to container

FROM alpine:latest

WORKDIR /application
COPY --from=builder /application/app /application
RUN apk add --no-cache delve
# let's start delve as the entrypoint
ENTRYPOINT ["/usr/bin/dlv", "debug", ".", "--listen=:40000", "--accept-multiclient", "--headless=true", "--api-version=2" , "exec" , "./app" ]

Answer 1

Not an expert in Go but in the second stage you are copying the files from first stage to the second one.

Those files could be the executable or source code

In the second stage you have installed the delve but when you are adding the Entry point or CMD it's showing error of this

exec: "go": executable file not found in $PATH

it's due to the second stage is alpine won't have Go installed by default and as you have not copied Go binary from the first to the second stage so showing a path error or missing error as dlv might be requiring it in background.

What you can do is install it with in first stage and move to second stage

RUN CGO_ENABLED=0 go install github.com/go-delve/delve/cmd/dlv@latest

stage 2

COPY --from=builder /go/bin/dlv /usr/bin/dlv