Remote debug Istio controlplane with delve in VSCODE

• Clone the istio repo
• Update the docker filewith ‘devle’ following the istio wiki
• Build image with debug enabled following the mentioned wiki as well. The github action can help if there is no container runtime in local to build.
• Update the image to the istiod deployment and update the ‘readOnlyRootFilesystem’ to ‘false’
• Build tunnel with ‘port-forward’ between local and the istiod pod at port 40000
• Configure the ‘.vscode/launch.json’ like below in the local istio repo if the image is built with github action. May need to add ‘substitutePath’ if necessary.

• Insert the ‘breakpoints’ in the code and launch the ‘debugging’

Reference:

• https://github.com/istio/istio/wiki/Remote-Debugging#attach-godelve-to-istiod-pod
• https://github.com/golang/vscode-go/blob/master/docs/debugging.md#launchjson-attributes