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cannot write files to a mounted nfs partition

I mounted an nfs partition from a remote server to this host (thea). I wrote this line to /etc/fstab file and mounted with -a option. all things looks ok except when I tried to write file to this partition. it doesn't let me create file to this partition even with "root" permission, please help.

[root@thea titanbackup]# touch testfile
touch: cannot touch `testfile': Permission denied

[root@thea mnt]# ls -alt
total 20
dr-xr-xr-x. 28 root root 4096 Aug 21 08:48 ..
drwxr-xr-x 2 root root 6 Jun 17 14:31 titanbackup
drwxr-xr-x. 6 root root 4096 Jun 14 21:07 .
drwxr-xr-x. 2 root root 4096 Feb 11 2014 hgfs
drwxr-xr-x. 2 root root 4096 Feb 10 2014 cdrom
drwxr-xr-x. 2 root root 4096 Feb 5 2014 ExternalHD
[root@thea mnt]#

[root@thea titanbackup]# mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_OS-home on /home type ext4 (rw)
/dev/mapper/vg_OS-tmp on /tmp type ext4 (rw)
/dev/mapper/vg_Gentran-LogVol00 on /u1 type ext4 (rw)
/dev/mapper/vg_OS-usr on /usr type ext4 (rw)
/dev/mapper/vg_OS-var on /var type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
titan.minkagroup.net:/u1/backup/thea/nfsbackup on /u1/nfsbackup type nfs (rw,vers=4,addr=10.10.4.55,clientaddr=10.10.4.234)
titan.minkagroup.net:/u1/backup/thea/nfsbackup on /mnt/titanbackup type nfs (rw,vers=4,addr=10.10.4.55,clientaddr=10.10.4.234)
[root@thea titanbackup]# cat /etc/*-release
LSB_VERSION=base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Red Hat Enterprise Linux Server release 6.5 (Santiago)
Red Hat Enterprise Linux Server release 6.5 (Santiago)
[root@thea titanbackup]#

root@thea titanbackup]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Mon Feb 3 23:20:58 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=011240a7-1286-43ef-9e77-889eada1b760 / ext4 defaults 1 1
UUID=8678f3c4-d9a0-44fe-96ea-f292b022c84e /boot ext4 defaults 1 2
/dev/mapper/vg_OS-home /home ext4 defaults 1 2
/dev/mapper/vg_OS-tmp /tmp ext4 defaults 1 2
/dev/mapper/vg_Gentran-LogVol00 /u1 ext4 defaults 1 2
/dev/mapper/vg_OS-usr /usr ext4 defaults 1 2
/dev/mapper/vg_OS-var /var ext4 defaults 1 2
UUID=969cf12d-482f-4b54-a6e0-79a8600509aa swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
#titan.minkagroup.net:/u1/backup/thea/nfsbackup /u1/nfsbackup nfs _netdev 0 0
titan:/u1/backup/thea/nfsbackup /mnt/titanbackup nfs _netdev 0 0
[root@thea titanbackup]#

ASKER CERTIFIED SOLUTION

Seth Simmons

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Jason Yu

ASKER

I just added the no_root_sqush to this titan server but it's still not working, could you check?

[root@titan ~]# cat /etc/exports
/u1/backup/jupiter 10.10.4.121(rw,sync)
/u1/backup/halo halobk(rw,sync)
/u1/backup/ora9igl 10.0.4.8(rw,sync)
/u1/centos *(rw,sync)
/u1/centos/centos-6_32 *(rw,sync)
/u3/appsperi 10.10.4.23(rw,sync) 10.10.4.111(rw,sync) elysium(rw,sync) phobos(rw,sync)
/u1/centos/rhel64_5.5 *(rw,sync)
/u2/backup/luna 10.0.4.21(rw,sync)
/u2/backup/luna/oracle 10.0.4.21(rw,sync)
/u1/backup/thea 10.10.4.234(rw,sync,no_root_squash)
[root@titan ~]#
-------------------------

[root@thea titanbackup]# mount titan:/u1/backup/thea/nfsbackup /mnt/titanbackup
mount.nfs: /mnt/titanbackup is busy or already mounted
[root@thea titanbackup]# umount -f /u1/nfsbackup
umount2: Invalid argument
umount: /u1/nfsbackup: not mounted
[root@thea titanbackup]# cd ..
[root@thea mnt]# umount -f /mnt/titanbackup/
[root@thea mnt]# mount -a
[root@thea mnt]# cd titanbackup/
[root@thea titanbackup]# touch test
touch: cannot touch `test': Permission denied
[root@thea titanbackup]#

SOLUTION

Seth Simmons

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Jason Yu

ASKER

It's working now, wonderful job.

[root@thea titanbackup]# touch test
[root@thea titanbackup]# ls -alt
total 4
-rw-r--r-- 1 root root 0 Aug 21 2014 test
drwxr-xr-x 2 root root 17 Aug 21 2014 .
drwxr-xr-x. 6 root root 4096 Jun 14 21:07 ..
[root@thea titanbackup]# rm -rf test
[root@thea titanbackup]#

Jason Yu

ASKER

what is exportfs command for? and option -a -r?

Jason Yu

ASKER

thanks, I figured it out by google. have a nice night.