Join Scott Simpson for an in-depth discussion in this video Diagnosing file access issues, part of LFCS: Storage Management (Ubuntu).
- [Instructor] Tracking down problems that users…or services are having,…can often come down to permissions issues.…Sometimes permission issues are easy to identify.…If you get a log message or other error…that points you in the right direction.…Otherwise you'll need to do some detective work…and figure it out.…A good place to start is with the file ACL tool, get F-A-C-L…or getfacl, which will list both the permissions…and access control lists for a file or folder…which may tell you what you need to know…to solve a permissions problem.…From there you can work to figure out whether a user…or a program is being prevented access…through explicit permissions…or through group membership.…
And if everything looks good,…be sure to check the permission structure…of the path to wherever you're looking.…Remember that listing a folder needs execute permissions.…Remember too, if you move a disk full of data…from one machine to another,…you might encounter strange permission problems.…Permissions are stored and calculated…with the ID number of groups and users, not the name.…
Join instructor Scott Simpson, as he shows how to manage and optimize file storage on Ubuntu Linux. First, learn how to create, modify, and mount partitions and filesystems, and manage swap space. Scott then combines these basics into more sophisticated solutions using volume management, and shows how to secure Linux storage and configure disk quotas and backup policies.
- Creating and modifying partitions
- Creating, modifying, and mounting filesystems
- Mounting encrypted partitions
- Creating redundant storage with RAID
- Working with physical volumes, volume groups, and logical volumes
- Securing filesystems with ACLs
- Backing up data