1452461 – NFSv2 is supported at RHEL 7 nfs server end after making changes in /etc/sysconfig/nfs to RPCNFSDARGS="-V 2". Not supported @ RHEL 7 client end.

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Bug 1452461 - NFSv2 is supported at RHEL 7 nfs server end after making changes in /etc/sysconfig/nfs to RPCNFSDARGS="-V 2". Not supported @ RHEL 7 client end.

Summary: NFSv2 is supported at RHEL 7 nfs server end after making changes in /etc/sysc...

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	nfs-utils
Sub Component:
Version:	7.0
Hardware:	x86_64
OS:	Linux
Priority:	high
Severity:	medium
Target Milestone:	rc
Target Release:	---
Assignee:	Steve Dickson
QA Contact:	Yongcheng Yang
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2017-05-19 05:37 UTC by Ashima Rawat
Modified:	2021-06-10 12:20 UTC (History)
CC List:	8 users (show)
Fixed In Version:	nfs-utils-1.3.0-0.53.el7
Doc Type:	If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed:	2018-04-10 18:21:01 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2018:0981	0	None	None	None	2018-04-10 18:22:27 UTC

Description Ashima Rawat 2017-05-19 05:37:50 UTC

Description of problem:

NFSv2 is supported at RHEL7 nfs server end after making changes in /etc/sysconfig/nfs to RPCNFSDARGS="-V 2". Not supported @ RHEL 7 client end.


Version-Release number of selected component (if applicable):
NFS Server: RHEL 7
NFS Client: RHEL 7
NFS Client: RHEL 6.5


How reproducible:

RHEL 7.3 NFS Server:

# cat /etc/redhat-release 
Red Hat Enterprise Linux Workstation release 7.3 (Maipo)

# exportfs -rav
exporting *:/test1

# grep -i RPCNFSDARGS /etc/sysconfig/nfs
RPCNFSDARGS="-V 2"

[2] Restartthe nfs-config.service:

# systemctl restart nfs-config.service

[3] Restart the nfs-server.service 

# systemctl restart nfs-server.service

# rpcinfo -l localhost 100003 2
   program vers  tp_family/name/class    address		  service
    100003  2    inet6/tcp/cots_ord      ::1.8.1                  nfs          
    100003  2    inet6/udp/clts          ::1.8.1                  nfs 

# systemctl restart nfs-server.service

# rpcinfo -p | grep -w nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs


NFS Client:
RHEL 7.2

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.2 (Maipo)

# mount -t nfs -o,vers=2 10.76.1.221:/test1 /mnt
mount.nfs: Protocol not supported <-----not supported

RHEL 6.5: mount operation is successful.

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.5 (Santiago)

# mount -t nfs -o,vers=2 x.x.x.x:/test1 /mnt

# grep -i vers=2 /proc/mounts
x.x.x.x:/test1 /mnt nfs rw,relatime,vers=2,rsize=8192,wsize=8192,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=x.x.x.x,mountvers=1,mountport=20048,mountproto=udp,local_lock=none,addr=x.x.x.x 0 0

Please make the required changes in man page of nfs along with the RHEL 7 documentation:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Storage_Administration_Guide/ch-nfs.html

Comment 6 J. Bruce Fields 2017-10-11 16:06:47 UTC

Proposed upstream man page patch:

http://lkml.kernel.org/r/20171011160243.GG25913@fieldses.org

Comment 8 Steve Dickson 2017-10-12 16:54:45 UTC

Needed upstream commmit

commit 25b8f8b9691f10651d900f1ee17f8606853ec544
Author: J. Bruce Fields <bfields>
Date:   Thu Oct 12 10:18:31 2017 -0400

    exports(5): minor exports man page typo

commit dcb5b1a7aba7c54c796cd892f2f9071b63ee80e1
Author: J. Bruce Fields <bfields>
Date:   Thu Oct 12 10:12:58 2017 -0400

    nfs(5): update some version information

Comment 21 Yongcheng Yang 2017-12-15 09:18:26 UTC

(In reply to Steve Dickson from comment #8)

Verified above 2 commits have been merged now.

[root@ ~]# rpm -q nfs-utils
nfs-utils-1.3.0-0.52.el7.x86_64
[root@ ~]# 
[root@ ~]# man exports | col -b | grep "the pNFS extension"
       pnfs   This  option  enables  the use of the pNFS extension if the protocol level is NFSv4.1 or higher, and the filesystem supports pNFS exports.
[root@ ~]# 
[root@ ~]# man nfs | col -b | grep -C 1 "Depending on kernel configuration"
       NFS  is  an Internet Standard protocol created by Sun Microsystems in 1984. NFS was developed to allow file sharing between systems residing on a
       local area network.  Depending on kernel configuration, the Linux NFS client may support NFS versions 2, 3, 4.0, 4.1, or 4.2.

[root@ ~]# man nfs | col -b | grep -C 1 "the client tries version"
       nfsvers=n      The  NFS  protocol version number used to contact the server's NFS service.  If the server does not support the requested version,
                      the mount request fails.  If this option is not specified, the client tries version 4.2 first, then negotiates down until it finds
                      a version supported by the server.
[root@ ~]# man nfs | col -b | grep -C 1 "for NFS version 4.0 and newer"
   Options for NFS version 4 only
       Use these options, along with the options in the first subsection above, for NFS version 4.0 and newer.

[root@ ~]# man nfs | col -b | grep -C 1 "client-established"

                      NFS protocol versions 4.1 and 4.2 use the client-established TCP connection for callback requests, so do not require the server to
                      connect to the client.  This option is therefore only affect NFS version 4.0 mounts.
[root@ ~]# man nfs | col -b | grep -C 1 "CONFIG_NFS_V2"

       The Linux client's support for protocol versions depend on whether the kernel was built with options CONFIG_NFS_V2, CONFIG_NFS_V3, CONFIG_NFS_V4,
       CONFIG_NFS_V4_1, and CONFIG_NFS_V4_2.
[root@ ~]# man nfs | col -b | grep -C 1 "version 4.0"
   Options for NFS version 4 only
       Use these options, along with the options in the first subsection above, for NFS version 4.0 and newer.

--
                      Specifies a single IPv4 address (in dotted-quad form), or a non-link-local IPv6 address, that the NFS client advertises  to  allow
                      servers  to  perform  NFS  version 4.0 callback requests against files on this mount point. If  the  server is unable to establish
                      callback connections to clients, performance may degrade, or accesses to files may temporarily hang.
--
                      NFS protocol versions 4.1 and 4.2 use the client-established TCP connection for callback requests, so do not require the server to
                      connect to the client.  This option is therefore only affect NFS version 4.0 mounts.

--
       RFC 2203 for the RPCSEC GSS API protocol specification.
       RFC 7530 for the NFS version 4.0 specification.
       RFC 5661 for the NFS version 4.1 specification.
[root@ ~]#

Comment 25 Yongcheng Yang 2018-01-10 08:40:26 UTC

Moving to VERIFIED according to comment #21 (plus following log)

[root@~ ]# rpm -q nfs-utils
nfs-utils-1.3.0-0.53.el7.x86_64
[root@~ ]# man nfs | col -b | grep -A2 nfsvers=n
       nfsvers=n      The  NFS protocol version number used to contact the server's NFS service.  If the server does not support the requested version, the
                      mount request fails.  If this option is not specified, the client tries version 4.1 first, then negotiates down until it finds a ver‐
                      sion supported by the server.
[root@ibm-x3550m4-02 ~]#

Comment 28 errata-xmlrpc 2018-04-10 18:21:01 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0981

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