Need Help with NFS file permissions

[Mark Phillips]

Todd,

Thanks for your comments. I was not very clear on how I am making the
backups.

Linux boxes - The machine with the usb drive attached is running rsnapshot
(ssh & rsync) to backup all the Linux boxes to the usb drive. The rsnapshot
script is run by cron at appropriate times. Restoring from the backups will
most likely be via ssh/cp or maybe an rsync if I need to move a lot of
files.

MacOS - the one laptop will access the usb drive over NFS using some native
MacOS backup application. I could have used Samba, but it is slower than
NFS, so I thought I would give NFS a try. I have to buy some software for
the Mac box to read/write ext4, but it is not very expensive. Restores will
be via NFS mount on the Mac box. I am a little out of my depth with the Mac
box (Macbook Pro).

Do you think I should switch to Samba for the MacOS backup?

Thanks!

Mark

On Fri, Dec 26, 2014 at 1:45 PM, Todd Millecam <tyggna at gmail.com> wrote:

> NFS exports might not be the technology you want to use.  If it's
> possible, I'd setup an rsync script, because that will let you preserve
> user permissions, directory structure, time stamp, and let you resume
> partial backups, and it's much easier to set it up on a timer via a cron
> script--it takes about 20 minutes to learn how to use and script with so
> it's really a good time investment.  I was in a shop that did NFS exports
> for a while only to find the backups weren't always viable and only had
> about a 70% success rate for a usable nightly backup.  When we switched
> over to rsync, we would only get one bad backup every two months.
> NFS just backs things up based on the Unix User ID in /etc/passwds (or
> whatever PAM authentication module you're using, so you'd really need to
> setup NIS in your house for this to work properly) on the host machine.  If
> the user doesn't exist, it will preserve the user id and permissions by
> default, but if that user/group doesn't exist on the server hosting the
> backup, then you won't have read-write permissions to restore it.
>
> On Fri, Dec 26, 2014 at 12:52 PM, Mark Phillips <
> mark at phillipsmarketing.biz> wrote:
>
>> I am setting up a usb drive to act as a NAS for backing up a couple of
>> computers (Linux and Mac) on my network. I have it running, but I want to
>> make sure I have the correct settings.
>>
>> I read quite a few Debian and Ubuntu howtos about NFS, but they sometimes
>> offered conflicting information. For the backups, I want to preserve the
>> file permissions, time stamp, etc.
>>
>> In /etc/exports I have
>>
>> /media/backup
>> 192.xxx.xxx.0/24(rw,sync,root_squash,no_subtree_check,fsid=0,insecure)
>>
>> The insecure is for Macs to access on ports other than 1024....at least
>> that is what one article said. It does not mean the connection is
>> insecure....
>>
>> /etc/fstab for the usb drive
>>
>> UUID=6997d1c2-5ed7-4f32-9d5e-564cadd7bc6c /media/backup ext4
>> rw,nodev,noexec,noatime,nodiratime,sync,data=ordered 0  0
>>
>> Thanks!
>>
>> Mark
>>
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>
>
>
> --
> Todd Millecam
>
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