When encountering the “mkdir permission denied” error while using Docker, it typically means that the user trying to create a directory does not have the necessary permissions. There are a few things you can do to fix this situation.
1. Specify a different user
By default, Docker runs containers as the root user. However, this can cause permission issues if the host directory you are trying to access has different ownership or permissions. You can specify a different user for the container to avoid this problem. Here’s an example:
docker run -u [USER_ID]:[GROUP_ID] [IMAGE_NAME]
2. Mount a volume with correct permissions
Another approach is to mount a volume from the host system into the container, ensuring that the correct permissions are set. Here’s an example:
docker run -v /host/directory:/container/directory [IMAGE_NAME]
3. Fix permissions in Dockerfile
If you have control over the Dockerfile, you can set the correct permissions during the build process. Here’s an example of using the chmod command to modify permissions:
RUN mkdir /path/to/directory
RUN chmod [PERMISSIONS] /path/to/directory
4. Set appropriate SELinux context
If you are using SELinux on your host system, it may be preventing the container from creating directories. You can set the appropriate SELinux context to allow this action. Here’s an example:
chcon -Rt svirt_sandbox_file_t /path/to/directory
By following one of these approaches, you should be able to resolve the “mkdir permission denied” error in Docker. Remember to adjust the commands and paths according to your specific setup.