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--- networking:nfs [2018/05/04 09:08]
gcooper
+++ networking:nfs [2022/04/13 14:20] (current)
gcooper
@@ Line 3: / Line 3: @@
   * NFS is a network file sharing protocol like SMB/CIFS
   * NFS allows multiple users to mount the same filesystem over a network
-  * NFS works well with the Citrix XenServer hypervisor
+  * NFS works well with the Citrix Hypervisor (XenServer) and XCP-ng hypervisors
-  * NFS is simpler to manage than iSCSI
+  * NFS is simpler to manage than iSCSI (block storage)
-    * May use bonding
+    * May use bonding for higher availability
   * iSCSI may offer better performance
-    * May use MPIO
+    * May use MPIO for higher availability
 https://www.slashroot.in/how-do-linux-nfs-performance-tuning-and-optimization
@@ Line 14: / Line 14: @@
 https://help.ubuntu.com/community/HighlyAvailableNFS
+===== Ubuntu =====
+<file>
+apt -y install nfs-common
+</file>
+===== Troubleshooting =====
+**NFSv4**: https://www.suse.com/support/kb/doc/?id=000017244
+<note tip>If you are having **root squash** problems, you might be able to specify ''vers=3'' as a client mount option to get around the issue.</note>
+<note warning>NFSv4 handles UID maping differently than NFSv3.  In NFS v4 with ''idmapd'', the same ''username@domainname'' must be recognized by both sides, or it will be mapped to ''nobody'' (regardless of root squash).</note>
+<file>
+mount    # show client mount details
+umount /path/mountpoint
+mount -a
+tail -30 /var/log/syslog
+nfsidmap[nnnnn]: nss_getpwnam: name 'root@somedomain.tld' does not map into domain 'localdomain'
+</file>
+<file>
+ps aux | grep idmapd
+vim /etc/idmapd.conf
+Domain = somedomain.tld
+nfsidmap -cv   # clear cache
+</file>

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