gograpple

gograpple that go program and delve into the high seas ... or in other words: delve debugger injection for your golang code running in k8 pods

requirements

• helm
• kubectl
• docker

quick start

brew install foomo/gograpple/gograpple
OR
go install github.com/foomo/gograpple@latest

start patch debugging in interactive mode

gograpple interactive

when you configure your patch correctly a file will be saved in your cwd and the debug session will start immmediatelly

configuration

patch (default)

field	default value	description
source_path		absolute path to the main.go (entrypoint)
cluster		cluster context to use
namespace		kubernetes namespace
deployment		kubernetes deployment
container		pod container to use
listen_addr	127.0.0.1:2345	address to listen on for delve server
image	alpine:latest	image to use as base when building the patch
delve_continue	false	continue the debugged process on start
launch_vscode	false	launch vscode with debug config

example config explained

if we use the following gograppe-patch example:

source_path: /home/runz0rd/dev/backend/cmd/search/search.go
cluster: gke_my-awesome-webshop-stage_europe-west1_default
namespace: stage-a
deployment: search-service-default
container: search
listen_addr: 127.0.0.1:2345
source_path: alpine:latest
delve_continue: false
launch_vscode: true

the following will happen:

• your application at specified source_path will be built with base image image into a patch image
• that patch image will be pushed into the same repo as the image thats originally deployed, for example my-image-repo.com/backend/search-service:some-tag will be my-image-repo.com/backend/search-service-patch:latest
• the deployment you specified in namespace and cluster will be patched to allow running a delve server on it with your application
• delve server will be started in your container and port-forwarded to be on listen_addr
• if configured delve_continue will be applied on dlv startup and launch_vscode will simplify the debug session for vscode users

common issues

stuck with patched deployment

in case your deployment is styck in patched state, use

gograpple rollback [namespace] [deployment]

vscode

The debug session doesnt start until the entrypoint is triggered more than once.

Review and remove any extra breakpoints you may have enabled, that you dont need (Run and Debug > Breakpoints panel). Vscode seems to like them saved across projects.