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| author |   NeilBrown <neilb@suse.de> | 2022-03-21 16:20:43 +1100 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2022-05-17 15:30:03 -0400 |
| commit | 5e12f172db9536df4720a50e8aa70c5e212c2037 (patch) | |
| tree | 779c748772663c11f85c935878a5569a8291efd2 /Documentation/admin-guide | |
| parent | NFS: Improve warning message when locks are lost. (diff) | |
| download | linux-dev-5e12f172db9536df4720a50e8aa70c5e212c2037.tar.xz linux-dev-5e12f172db9536df4720a50e8aa70c5e212c2037.zip | |
NFS: update documentation for the nfs4_unique_id parameter
The documentation for nfs4_unique_id is out-of-date. In particular it
claim that when nfs4_unique_id is set, the host name is not used. since
Commit 55b592933b7d ("NFSv4: Fix nfs4_init_uniform_client_string for net
namespaces") both the unique_id AND the host name are used.
Update the documentation to match the code.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/nfs/nfs-client.rst | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/Documentation/admin-guide/nfs/nfs-client.rst b/Documentation/admin-guide/nfs/nfs-client.rst index 6adb6457bc69..36760685dd34 100644 --- a/Documentation/admin-guide/nfs/nfs-client.rst +++ b/Documentation/admin-guide/nfs/nfs-client.rst @@ -36,10 +36,9 @@ administrative requirements that require particular behavior that does not work well as part of an nfs_client_id4 string. The nfs.nfs4_unique_id boot parameter specifies a unique string that can be -used instead of a system's node name when an NFS client identifies itself to -a server. Thus, if the system's node name is not unique, or it changes, its -nfs.nfs4_unique_id stays the same, preventing collision with other clients -or loss of state during NFS reboot recovery or transparent state migration. +used together with a system's node name when an NFS client identifies itself to +a server. Thus, if the system's node name is not unique, its +nfs.nfs4_unique_id can help prevent collisions with other clients. The nfs.nfs4_unique_id string is typically a UUID, though it can contain anything that is believed to be unique across all NFS clients. An @@ -53,8 +52,12 @@ outstanding NFSv4 state has expired, to prevent loss of NFSv4 state. This string can be stored in an NFS client's grub.conf, or it can be provided via a net boot facility such as PXE. It may also be specified as an nfs.ko -module parameter. Specifying a uniquifier string is not support for NFS -clients running in containers. +module parameter. + +This uniquifier string will be the same for all NFS clients running in +containers unless it is overridden by a value written to +/sys/fs/nfs/net/nfs_client/identifier which will be local to the network +namespace of the process which writes. The DNS resolver |