Troubleshooting FROM scratch

Troubleshooting FROM scratch

Missing tools

Many containers only contain a single binary

No shell, no tools

Solution

Dump root partition content into container

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Demo: Troubleshooting FROM scratch

Container with image FROM scratch:

docker run -d --name traefik traefik:v1.7

Create local rootfs:

mkdir rootfs
docker create --name alpine alpine
docker cp alpine:/ rootfs

Copy into container:

rm rootfs/etc/hosts rootfs/etc/hostname rootfs/etc/resolv.conf
cd rootfs && docker cp . traefik:/ && cd ..

Enter container:

docker exec -it traefik /bin/sh