X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fexportfs%2Fexports.man;h=2b316f546bd95187622a4697d750f3410850adf4;hp=62239441f6f8485e027b7ea33abd1401e40e56db;hb=442c362b033ff30be49e162db8a57d8e375a6f1f;hpb=d38ea02d0e4bcdc4e0114567028596f7bcba45b9 diff --git a/utils/exportfs/exports.man b/utils/exportfs/exports.man index 6223944..2b316f5 100644 --- a/utils/exportfs/exports.man +++ b/utils/exportfs/exports.man @@ -1,5 +1,4 @@ -.TH EXPORTS 5 "28 October 1999" -.UC 5 +.TH EXPORTS 5 "4 March 2005" "Linux" "Linux File Formats Manual" .SH NAME exports \- NFS file systems being exported (for Kernel based NFS) .SH SYNOPSIS @@ -79,6 +78,11 @@ may work by accident when reverse DNS lookups fail. '''.B \-\-public\-root '''option. Multiple specifications of a public root will be ignored. .PP +.SS RPCSEC_GSS security +To restrict access to an export using rpcsec_gss security, use the special +string "gss/krb5" as the client. It is not possible to simultaneously require +rpcsec_gss and to make requirements on the IP address of the client. +.PP .SS General Options .IR exportfs understands the following export options: @@ -166,7 +170,7 @@ The option can be explicitly disabled with .TP .IR no_subtree_check This option disables subtree checking, which has mild security -implications, but can improve reliability is some circumstances. +implications, but can improve reliability in some circumstances. If a subdirectory of a filesystem is exported, but the whole filesystem isn't then whenever a NFS request arrives, the server must @@ -185,7 +189,7 @@ subtree checking is also used to make sure that files inside directories to which only root has access can only be accessed if the filesystem is exported with .I no_root_squash -(see below), even the file itself allows more general access. +(see below), even if the file itself allows more general access. As a general guide, a home directory filesystem, which is normally exported at the root and may see lots of file renames, should be @@ -218,6 +222,21 @@ be explicitly requested with either of the synonymous .IR auth_nlm , or .IR secure_locks . +.TP +.IR no_acl +On some specially patched kernels, and when exporting filesystems that +support ACLs, this option tells nfsd not to reveal ACLs to clients, so +they will see only a subset of actual permissions on the given file +system. This option is safe for filesystems used by NFSv2 clients and +old NFSv3 clients that perform access decisions locally. Current +NFSv3 clients use the ACCESS RPC to perform all access decisions on +the server. Note that the +.I no_acl +option only has effect on kernels specially patched to support it, and +when exporting filesystems with ACL support. The default is to export +with ACL support (i.e. by default, +.I no_acl +is off). '''.TP '''.I noaccess @@ -256,6 +275,28 @@ If a path is given (e.g. then the nominted path must be a mountpoint for the exportpoint to be exported. +.TP +.IR fsid= num +This option forces the filesystem identification portion of the file +handle and file attributes used on the wire to be +.I num +instead of a number derived from the major and minor number of the +block device on which the filesystem is mounted. Any 32 bit number +can be used, but it must be unique amongst all the exported filesystems. + +This can be useful for NFS failover, to ensure that both servers of +the failover pair use the same NFS file handles for the shared filesystem +thus avoiding stale file handles after failover. + +Some Linux filesystems are not mounted on a block device; exporting +these via NFS requires the use of the +.I fsid +option (although that may still not be enough). + +The value 0 has a special meaning when use with NFSv4. NFSv4 has a +concept of a root of the overall exported filesystem. The export point +exported with fsid=0 will be used as this root. + .SS User ID Mapping .PP .I nfsd @@ -460,6 +501,12 @@ don't use a reserved port for NFS. '''entry. .SH FILES /etc/exports +.SH SEE ALSO +.BR exportfs (8), +.BR netgroup (5), +.BR mountd (8), +.BR nfsd (8), +.BR showmount (8). '''.SH DIAGNOSTICS '''An error parsing the file is reported using syslogd(8) as level NOTICE from '''a DAEMON whenever nfsd(8) or mountd(8) is started up. Any unknown