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Forum Discussion
Issue with old user permissions and NFS
I recently migrated my RN214 to expose NFS shares instead of SMB (no Windows PCs anymore). Turned out that there was a UID collision, user "volker" was auto-assigned UID 100 which I didn't care too m...
...even as admin user belonging to the admin group. sudo does not exist and for su - I don't know the root password - if there is any.
root is just a name, e.g. in /etc/passwd or some other authentication store. You could just as well call the account admin, and the OS itself won't care, ...
Key is the UID/GID:0 - this is what -all- U**x'es Kernel and the code care about.
There seems to be a long way ahead on your Linux learning curve. Not sure abandoning SMB in favour of NFS is a good idea therefore.
Well possible, there is -much-more around of these files and folders than U**x file and folder permissions:
Files can be secured through U**x file permissions - based on UID and GID - and through ACLs. Files with sticky bits, and files that are executable, require special security measures. What ever of these (visible and harder visible) does deny you desired action or actions.
Thanks for not being helpful at all. But perhaps you can shine your light on me to shorten the long and steep learning curve with some instructions how to change ownership of the files belonging to UID 100 to UID 1000 on the RN214 without copying over a large backup. Or alternatively how rsync -aHAX can update permissions of a NFS share when the target file belongs to a UID that does not match the user who runs rsync.
In terms of abandoning SMB: Whether or not the idea was good is indeed arguable. The truth being that after an update of my Linux PC, modification time of files copied to the NAS via cp -p or rsync -t was suddently not preserved anymore and I got fed up with this lottery messing up any reasonable incremental backup.
For details, head over to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2007055
https://community.netgear.com/discussions/readynas-use/modification-time-preservation-issue-using-smb-in-certain-configurations-with-re/2361349
and make sure to leave a juicy comment there as well.
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