Debug `FROM scratch` containers by injecting contents of another image
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injecto
injecto dynamically transfers the contents of an image into a running container, regardless of the base image of the running container.
Imagine a scenario where you're running a
FROM scratchimage but want to exec into the container for debugging purposes. Using injecto you could inject the contents of Alpine or any other base image into the container and then have access to its shell and package manager.
Usage
injecto can be run as either a standalone binary or via Docker.
injecto![]()
docker run -it -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp joshwget/injecto![]()
Example
First, let's run a container built from a
FROM scratchimage.
joshwget/sleeperonly contains a simple Go binary that spins forever.
> docker run -d joshwget/sleeper /sleeper 79f7232e5f30
Trying to exec into this container will result in an error because the base image contains no shell.
> docker exec -it 79f7232e5f30 sh exec: \"sh\": executable file not found in $PATH
Now let's use injecto to inject Alpine.
> docker run -it -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp joshwget/injecto alpine 79f7232e5f30
If you try to exec again, you'll be in a shell!
> docker exec -it 79f7232e5f30 sh / #