I'm using Docker Desktop on Windows 10. For the purposes of development, I want to expose a local folder to a container. When running the container in Docker, I do this by specifying the volume flag (-v).
How do I achieve the same when running the container in Kubernetes?
You should use hostpath Volume type in your pod`s spec to mount a file or directory from the host node’s filesystem, where hostPath.path field should be of following format to accept Windows like paths:
Please check this github issue explaining peculiarities of Kubernetes Volumes on Windows. I assume also that you have enabled Shared Drives feature in your Docker for Windows installation.
Using k8s 1.21.5 the following type of path worked for me:
/run/desktop/mnt/host/c/PATH/TO/FILE
Digging through this github issue helped me resolve which path to use: https://github.com/kubernetes/kubernetes/issues/59876
The explanation is on the github link above.
The folder mount for
/run/desktop/mnt/host/cdoes not exist on the distro you installed in WSL2 - on that WSL2 distro, the mount point to your C:\ drive is the more obvious/mnt/c.Realize that Kubernetes and Docker are not installed in your installed WSL2 distro. Instead, Docker Desktop for Windows creates its own WSL2 VM called
docker-desktopand installs Docker and Kubernetes on that VM. Then Docker Desktop for Windows installs thedockerandkubectlCLIs on your WSL2 distro (and also on your Windows machine) and configures them all to point to the Docker and Kubernetes instances it created on thedocker-desktopVM. This docker-desktop VM is hosting Docker and Kubernetes and also contains the/run/desktop/mnt/host/cmount point to your Windows C:\ drive and that can be used by your containers to persist data.You can remote into the
docker-desktopVM and see the/run/desktop/mnt/host/cmount point and folder structure by following the instructions (and discussion) at https://stackoverflow.com/a/62117039/11057678:docker run -it --rm --privileged --pid=host justincormack/nsenter1