Red Hat Enterprise Virtualisation and NFS

[A_Tomczak]

Hi,

i have a little problem. I try to create a NFS Datastore for ISO´s in my Redhat EV Cluster. In the Redhat Depolmentguide:

( http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/Red_Hat_Enterprise_Virtualization_for_Servers/2.1/html/RHEV_for_Servers_Installatio... )

i can read this:

• Determine the NFS share directory. For example, if you intend to share /RHEV/Images, enter the following line into the /etc/exports file.

                                /RHEV/Images       *(rw,no_root_squash)
  

  Restart the NFS service.

• The NFS export directory must be configured for read write access and must be owned by vdsm:kvm. If these users do not exist on your external NFS server use the following commands, assuming that /RHEV/Images is the NFS share.

     chown -R 36:36 /RHEV/Images

     chmod g+s /exports/* -R

     chmod u+s /exports/* -R

How can i configure a Netapp FAS System to satisfy this requirements?

[evilensky]

I think you are looking at the NFS server setup in RHEL...are you planning to use a RHEL server for NFS serving, or are you serving NFS from your filer?

[rkaramchedu1 · Accepted solution]

You can prevent root squashing to occur for this mount point and as root, can make the changes.

Something like below

On the NetApp

732sql@simtap1> exportfs -p rw,anon=0 /vol/RHEV
732sql@simtap1> exportfs
     /vol/RHEV       -sec=sys,rw,anon=0

On the client

sh-3.2# mount  172.16.56.153:/vol/RHEV /RHEV/
sh-3.2# df -h
Filesystem                Size   Used  Avail Capacity  Mounted on
172.16.56.153:/vol/RHEV  2.0Gi  113Mi  1.9Gi     6%    /RHEV
sh-3.2# cd /RHEV/
sh-3.2# mkdir Images
sh-3.2# chown -R 36:36 Images 
sh-3.2# chmod u+s Images
sh-3.2# chmod g+s Images
sh-3.2# ls -ltr
total 208835
drwxrwxrwx  5 root  wheel       4096 Mar 13 22:51 .snapshot
drwsr-sr-x  2 36    36          4096 Apr 25 08:38 Images

[bjon]

Hi,

The short answer is that you can not change the ownership from the NetApp FAS controller.  Here is how you satisfy the requirement: before you mount the NFS from RHEV-M the first time, mount the NFS export manually.  Then change the ownership (chown 36.36 /path/to/export), then unmount the export.  RHEV-M can now mount/unmount the export as necessary.  You will only have to mount it manually once.

I have this and more documented in a joint RHEV/NetApp document here: http://www.netapp.com/us/library/technical-reports/tr-3914.html

Jon (jb)