如何将 docker 容器目录复制到 Google Compute Engine 实例

Question

I'm new to Google Cloud and Docker and I can't for the life of me figure out how to copy directories from the Docker container (pushed to the Container Registry) to the Google Compute Engine instance. I think I need to mount the volume but I don't really know how. In the docker container the main directory is /app which has my files. Basically I want to do this to see the docker container's files in Google Cloud.

I assumed that if i did: docker pull [HOSTNAME]/[PROJECT-ID]/[IMAGE]:[TAG] inside the cloud shell that the files would show up somewhere in the cloud shell ie in var/lib/docker but when I cd to var/lib/docker and type in: ls I get

ls: cannot open directory '.': Permission denied

Just to add I've tried following the "Connecting to Cloud Storage buckets" tutorial https://cloud.google.com/compute/docs/disks/gcs-buckets But realised that this is for single files. Is it possible to copy over the whole root directory of the Docker image using gsutil? Do I need to use something else instead, like persistent disks?

Answer 1

You need to have docker installed in order to run your images and of course be able to copy anything from inside the image to your host filesystem.

Use docker cp CONTAINER:SRC_PATH DEST_PATH to copy files.

Have a look at the official Docker Documentation on how to use this command. Simillar topic was also discussed here on StackOverflow and has a very good answer.