exportfs

What it does

How to write it

exportfs [-avfrsu] [-o OPTIONS] [CLIENT:/PATH]
exportfs -ra | -ua | -v | -s

Most used

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$ run as a normal user# run as root (or with sudo)

1. 1Apply changes of /etc/exports

   #exportfs -ra

   No restart of nfs-server needed.

2. 2Show active exports

   #exportfs -v
   /exports/data  192.168.122.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,root_squash,no_all_squash)

   All options, also the defaults.

3. 3Example exports file

   #cat /etc/exports
   /exports/data  192.168.122.0/24(rw,sync)
   /exports/home  192.168.122.0/24(rw,sync)

   Folder, then client(options) — no space before the bracket!

4. 4Export for a moment (not saved)

   #exportfs -o ro,sync 192.168.122.20:/srv/iso

   Gone after a restart.

5. 5Stop exporting one folder

   #exportfs -u 192.168.122.0/24:/exports/data

   Clients lose access.

6. 6Stop all exports

   #exportfs -ua

   For maintenance.

7. 7Files in exports.d

   #echo "/srv/iso *(ro)" > /etc/exports.d/iso.exports; exportfs -ra

   One file per share is easy to manage.

8. 8The space mistake

   #cat /etc/exports
   /exports/data 192.168.122.0/24 (rw)

   With a space, (rw) applies to everyone and the network gets read-only: a security hole.

9. 9Read-only for all, write for one host

   #echo "/exports/pub *(ro) 192.168.122.20(rw)" >> /etc/exports; exportfs -ra

   Different options per client.

10. 10Check the server service

    #systemctl status nfs-server

    exportfs works only with the server running.

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Files

/etc/exports, /etc/exports.d/*.exports

Export definitions.

/var/lib/nfs/etab

The active export table.

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