NFS Share Does Not Allow "root" To Write Files "Read-Only Filesystem. Permission denied." While Other Users Can Write Into The Share (Doc ID 1639351.1)

Last updated on APRIL 23, 2020

Applies to:

Symptoms

No write access to NFS share for "root" even though the mount is "rw":

[root@nfsclient ~]# 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)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
10.x.x.45:/exports on /mnt type nfs (rw,addr=10.x.x.45)

[root@nfsclient ~]# cd /mnt/
[root@nfsclient mnt]# ls
test_file
[root@nfsclient mnt]# touch test_file
touch: cannot touch 'test_file': Read-only file system
[root@nfsclient mnt]# cp test_file test_file1
cp: cannot create regular file 'test_file1': Permission denied

Non-root users on the NFS client have R/W access.

Changes

Check NFS exported options on NFS Server:

Note the root_squash mount option. This option is set by default and must be disabled if not wanted.

Cause

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