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When using docker cp to move files from my local machine /tmp/data.txt to the container, it fails with the error:

lstat /tmp/data.txt: no such file or directory

The file exists and I can run stat /tmp/data.txt and cat /tmp/data.txt without any issues.

Even if I create another file in /tmp like data2.txt I get the exact same error.

But if I create a file outside /tmp like in ~/documents and copy it with docker cp it works fine.

I checked out the documentation for docker cp and it mentions:

It is not possible to copy certain system files such as resources under /proc, /sys, /dev, tmpfs, and mounts created by the user in the container

but doesn't mention /tmp as such a directory.

I'm running on Debian 10, but a friend of mine who is on Ubuntu 20.04 can do it just fine.

We're both using the same version of docker (19.03.11).

What could be the cause?

Daniel
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1 Answers1

3

I figured out the solution.

I had install docker as a snap. I uninstalled it (sudo snap remove docker) and installed it using the official Docker guidelines for installing on Debian.

After this, it worked just fine.

I think it might've been due to snap packages having limited access to system resources - but I don't know for sure.

Daniel
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