Copying files from a Docker container onto local machine


This past week, I’ve spent time wiping away my ignorance of containers. To do this, I started in my usual way:

  1. Buy a bunch of books. Probably too many.
  2. Work through books, doing exercises as I go.

The first book I’m running through is Using Docker: Developing and Deploying Software with Containers by Adrian Mouat. I’m posting this bit now to hopefully help others.

When working through the exercise to backup the redis database in Chapter 3, I ran the command to backup the database:

docker run --rm --volumes-from myredis -v $PWD/backup:/backup debian cp /data/dump.rdb /backup/

This then emits the error message:

C:\Program Files\Docker\Docker\Resources\bin\docker.exe: Error response from daemon: Drive has not been shared.
 See 'C:\Program Files\Docker\Docker\Resources\bin\docker.exe run --help'.

This is happening because I never shared the C-Drive with Docker. To do this, right click on the Docker icon sitting in your toolbar and select Settings… . Then, select Shared Drives and check the drive(s) on your system which you want to be able to use. DockerSettingsSharedDrive

Upon clicking Apply, enter your credentials. The command should now work.

One other note: I found that the command did not work right in cmd.exe or some bash shells. It did work just fine from a powershell window. So, that’s another note…

 

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