Specifying access restrictions in /etc/exports

How to specify access restrictions

You specify access restrictions by using a text editor to modify the /etc/exports file. Access restrictions take effect only after you subsequently use the exportfs command.

Specifying the same restrictions for all hosts

For all hosts to mount read-write

To enable all hosts to mount the resource read-write, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource without any options. Example /vol/vol0/home Result All hosts can mount the /vol/vol0/home directory as read-write.

For all hosts to mount a resource read-only

To enable all hosts to mount the resource read-only, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource with the `ro` option. Example /vol/vol0/home -ro Result All hosts can mount the /vol/vol0/home directory as read-only.

Specifying different restrictions for different hosts

For specified hosts to mount read-write

To allow only certain hosts to mount the resource read-write and to prevent other hosts from mounting the resource, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource with the `rw` option. Example /vol/vol0/home -rw=host1:host2 Result Host1 and host2 can mount the /vol/vol0/home directory as read-write. Other hosts cannot mount the /vol/vol0/home directory.

For specified hosts to mount read-only

To allow certain hosts to mount the resource read-only and prevent other hosts from mounting the resource, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource with the `ro` option. Example /vol/vol0/home -ro=host1:host2 Result Host1 and host2 can mount the /vol/vol0/home directory as read-only. Other hosts cannot mount the /vol/vol0/home directory.

For specified hosts to mount read-write and all others to mount read-only

To enable certain hosts to mount a resource read-write and all other hosts to mount the resource read-only, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource with the `ro` and `rw` options. Example /vol/vol0/home -ro,rw=host1:host2 Result Host1 and host2 can mount the /vol/vol0/home directory as read-write. All other hosts can mount the /vol/vol0/home directory as read-only.

For specified hosts to mount read-write and specified hosts to mount read-only

To allow certain hosts to mount a resource read-write and certain other hosts to mount the resource read-only, complete the following step.

Step	Action
1	In the /etc/exports file, enter the path name of the resource with the `rw` and `rw` options. Example /vol/vol0/home -ro=host2,rw=host1 Result Host1 can mount the /vol/vol0/home directory as read-write. Host2 can mount the /vol/vol0/home directory as read-only. Other hosts cannot mount the /vol/vol0/home directory.

Step

Action

In the /etc/exports file, enter the path name of the resource with the rw and rw options.

Example

/vol/vol0/home -ro=host2,rw=host1

Result

Host1 can mount the /vol/vol0/home directory as read-write. Host2 can mount the /vol/vol0/home directory as read-only. Other hosts cannot mount the /vol/vol0/home directory.