Mount /usr on different partition

Question

I want to mount /usr directory on different partition and keep the same owner on all files and subdirectories in /usr directory.

I want to mention that this issue is for linux ec2 machine where I can't enter to the single-user runlevel.

Is it possible?

user9517 · Accepted Answer · 2014-05-22 13:06:32Z

6

Yes, this is almost certainly possible.

Mount the new partition somewhere in your filesystem.
- mount /path/to/device /mnt
Copy the contents of your current /usr to the new partition.
- rsync -a /usr /mnt
Unmount the new partition.
- umount /mnt
Update your /etc/fstab to reflect the changes.
- /path/to/device /usr defaults 0 0
Mount the new partition.
- mount /usr

answered May 22, 2014 at 12:19

user9517

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I've already done this but all the files and directories are owned by the root user and some services cannot access certain files in /usr
– ibedelovski
May 22, 2014 at 12:50
On a CentOS system I have to hand there are only a handful of directories and files in /usr that aren't owned by uid/gid 0 and the rsync command copies the ownership/permissions on these correctly.
– user9517
May 22, 2014 at 12:59
1

Be careful with this because that don't seem to be working e.g on Ubuntu (see link). Also it's probably a good idea to use -H option to copy hard links as there are some in /usr directory and rsync -a doesn't include hard links. See problems on Ubuntu here: askubuntu.com/questions/1167612/…
– Nux
Aug 22, 2019 at 11:03

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