Container Runtime Debugging Support Images (aka Duct Tape)

This repository defines a set of container images that package the language runtime dependencies required to enable step-by-step debugging of apps with skaffold debug. These container images are suitable for use as initContainers on a pod. When executed, each container image copies these dependencies to /dbg/<runtimeId>.

The idea is that skaffold debug will transform k8s manifests to make available any support files required to debug specific language runtimes. For example, a Kubernetes podspec would be transformed to

• create a volume to hold the debugging support files
• run one or more of these images as initContainers to populate this volume, mounted as /dbg
• mount this volume on the applicable containers as /dbg with suitably transformed command-line in the entrypoint and arguments

Current language runtimes:

• go: provides Delve
• python: provides ptvsd, a debug adapter that can be used for VS Code and more, for Python 2.7 and 3.5+
• nodejs: provides a node wrapper that propagates --inspect args to the application invokation
• netcore: provides vsdbg for .NET Core

Distribution

The latest released images, which are used by skaffold debug, are available at:

gcr.io/k8s-skaffold/skaffold-debug-support

Images from a particular release are available at:

gcr.io/k8s-skaffold/skaffold-debug-support/<release>

Images from the latest commit to HEAD are available at our staging repository:

us-central1-docker.pkg.dev/k8s-skaffold/skaffold-staging/skaffold-debug-support

You can configure Skaffold to use a specific release or the staging repository with the following:

skaffold config set --global debug-helpers-registry <repository>

Contributing

See CONTRIBUTING for how to contribute!