👀 Views: 98 💬 Answers: 1 📅 Created: 2025-07-11

docker linux permissions bash

I'm upgrading from an older version and I'm attempting to set up I've encountered a strange issue with I'm working with a frustrating `permission denied` behavior when trying to use the `docker cp` command to copy files from a container to my local filesystem on an Ubuntu 22.04 setup... Here’s the command I’m running: ```bash docker cp my_container:/path/to/file.txt /local/path/file.txt ``` However, I get the following behavior message: ``` behavior: failed to copy: behavior response from daemon: behavior mounting '/var/lib/docker/containers/.../mounts/shm' to rootfs at '/mnt/shm': mount /var/lib/docker/containers/.../mounts/shm:/mnt/shm: permission denied ``` I've checked that I have sufficient permissions on the local destination directory, and I even tried running the command with `sudo`, but I still receive the same behavior. The Docker container is running as the `root` user, and I verified that I can access the file directly from within the container without issues. I also confirmed that the Docker service is running properly with `systemctl status docker` and there are no apparent issues. To troubleshoot, I attempted copying the file to a different directory with more relaxed permissions: ```bash docker cp my_container:/path/to/file.txt /tmp/file.txt ``` This didn't work either, and I received the same permission behavior. I also checked the Docker daemon logs for any additional insights: ```bash journalctl -u docker.service --since "10 minutes ago" ``` I found several relevant entries, but nothing that points to a clear solution. Is there a specific configuration or environment variable I might be missing, or is there something about Docker's handling of file permissions in this context that I need to change? Any help would be greatly appreciated! This is happening in both development and production on Ubuntu 22.04. Thanks for taking the time to read this! Any examples would be super helpful.