Reexport NFS directories without the need to restart NFSD

Post by **cah** » Mon Sep 23, 2019 4:58 pm

I had a need to add a new subnet to an exported directory on the NFS server. The server has some exported directories and I don't want to restart nfs to potentially affect other currently mounted directories to NFS clients.

The way to do it is to use '"exportfs -arv".

1. Check current exported file systems on laxm1311. 10.0.23.0/24 is not included for /usr/sap/trans (/export/trans)

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laxm1311:/%exportfs
/export/sapmnt  10.0.24.0/24
/export/sapmnt  10.0.26.0/24
/export/trans   10.0.22.0/24
/export/trans   10.0.24.0/24
/export/trans   10.0.26.0/24
/export/oraarch2
                10.0.24.0/24
/export/trans_cofiles
                10.0.24.0/24
/export/trans_data
                10.0.24.0/24

2. Run exportfs -arv command to add the new subnet (10.0.23.0/24)

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laxm1311:/%exportfs -arv
exporting 10.0.24.0/24:/export/trans_data
exporting 10.0.24.0/24:/export/trans_cofiles
exporting 10.0.24.0/24:/export/oraarch2
exporting 10.0.22.0/24:/export/trans
exporting 10.0.23.0/24:/export/trans
exporting 10.0.24.0/24:/export/trans
exporting 10.0.26.0/24:/export/trans
exporting 10.0.24.0/24:/export/sapmnt
exporting 10.0.26.0/24:/export/sapmnt

3. Check exported file systems on laxm1311 again. New subnet appears.

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laxm1311:/%exportfs     
/export/sapmnt  10.0.24.0/24
/export/sapmnt  10.0.26.0/24
/export/trans   10.0.22.0/24
/export/trans   10.0.23.0/24
/export/trans   10.0.24.0/24
/export/trans   10.0.26.0/24
/export/oraarch2
                10.0.24.0/24
/export/trans_cofiles
                10.0.24.0/24
/export/trans_data
                10.0.24.0/24

All without restarting NFSD.

I then mounted /usr/sap/trans on laxm1261 (10.0.23.36) successfully.

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laxm1261:/ %mount -v /usr/sap/trans
mount.nfs4: timeout set for Mon Sep 23 13:39:43 2019
mount.nfs4: trying text-based options 'intr,vers=4.1,addr=10.0.24.50,clientaddr=10.0.23.36'
mount.nfs4: mount(2): Protocol not supported
mount.nfs4: trying text-based options 'intr,vers=4.0,addr=10.0.24.50,clientaddr=10.0.23.36'

laxm1261:/ %df -hP
Filesystem                           Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-LogVol00           59G  8.4G   48G  15% /
devtmpfs                              48G     0   48G   0% /dev
tmpfs                                 48G  492K   48G   1% /dev/shm
tmpfs                                 48G   70M   48G   1% /run
tmpfs                                 48G     0   48G   0% /sys/fs/cgroup
tmpfs                                 48G   16K   48G   1% /tmp
/dev/mapper/vg_data-lvdb3            100G   89G   12G  89% /db3
/dev/sda1                            477M  260M  188M  59% /boot
/dev/mapper/vg_data-lvdb6             30G   25G  5.9G  81% /db6
/dev/mapper/vg_data-lvdb7            100G   94G  7.0G  94% /db7
/dev/mapper/vg_data-lvcachejrn       180G   52G  129G  29% /cachejrn
/dev/mapper/vg_data-lvdb1            160G  151G  9.1G  95% /db1
/dev/mapper/vg_data-lvcachesys        40G   23G   18G  56% /cachesys
/dev/mapper/vg_data-lvdb2            600G  482G  119G  81% /db2
/dev/mapper/vg_data-lvdb4            240G  197G   44G  82% /db4
/dev/mapper/vg_data-lvdb5            1.2T  1.2T   78G  94% /db5
/dev/mapper/vg_data-lvjrnbackup       40G   35M   40G   1% /jrnbackup
/dev/mapper/vg_data-lvidx_share       13G  2.8G   11G  22% /idx_share
/dev/mapper/vg_data-lvcachealtjrn    5.0G   33M  5.0G   1% /cachealtjrn
/dev/mapper/vg_data-lvdba            2.0G   33M  2.0G   2% /dba
/dev/mapper/vg_data-lvedi             30G   88M   30G   1% /edi
/dev/mapper/rootvg-LogVol02           12G  3.7G  7.2G  34% /var
laxm1151:/                            99G  105M   94G   1% /var/crash
laxm1bnas50:/vol/sapdms1/sapdevdms1  6.7T  5.8T  870G  88% /sapdevdms1
tmpfs                                9.5G     0  9.5G   0% /run/user/4005
tmpfs                                9.5G     0  9.5G   0% /run/user/2003
tmpfs                                9.5G     0  9.5G   0% /run/user/3004
tmpfs                                9.5G     0  9.5G   0% /run/user/4002
tmpfs                                9.5G     0  9.5G   0% /run/user/1000
laxm1311:/export/trans               935G  268G  620G  31% /usr/sap/trans