erosita-forum

Hi,

I'm using the eSASS Docker container following Section 3.2 of https://erosita.mpe.mpg.de/edr/DataAnal ... _container

Say I have my data stored in /mnt/user/data/, where I have various eROSITA event lists stored. Then to run the container I enter:
docker run --volume /path/to/caldb:/home/idies/caldb --volume /mnt/usr/data:/data -it --rm erosita/esass-minimal:latest /bin/bash

Great, within the container I can see the files are present in /data/ and it appears the eSASS tasks are recognized. The problem arises when I try to run them from within /data/, e.g. by running
flaregti fm00_700201_020_EventList_c001.fits

I am faced with the error: "flaregti/flaregti_mod: **STOP** Cannot open event file"

If I try "touch fm00_700201_020_EventList_c001.fits" I get a "Permission denied". And I can't run "sudo touch fm00_700201_020_EventList_c001.fits", because I don't know the password for idies. The same problem happens if I try to create and write to a new file within /data, Permission Denied.

Apologies if this is a basic Docker question, I am unfamiliar with the platform before this. Thanks in advance!

Dear Joheen

I suspect your problem comes from the internal path you have chosen:

--volume /mnt/usr/data:/data

By doing this, you mount your data folder at the root of the docker file system, and you can write at this level (the docker run a Linux system).

I suggest to change the second "volume" option to point to a (sub)folder in the docker user (idies) home folder /home/idies/
So something like:
--volume /mnt/usr/data: /home/idies/data

This should allow you to read, create and modify files in the mounted folder.

Regards
Alain on behalf of the eSASS team

Thank you for the suggestion! It made me realize that the error was even simpler than thisy. The permissions on /mnt/usr/data were set to "drwxrwxr-x", while I didn't realize I needed the "other" permission set to "rwx". Once I changed this I am able to modify and create files within the container, whether in /home/idies/data or even just /data.

Thanks,
Joheen