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    NFS-Utils-2.3.4

Introduction to NFS Utilities

The NFS Utilities package contains          the userspace server and client tools necessary to use the kernel's          NFS abilities. NFS is a protocol that allows sharing file systems          over the network.

This package is known to build and work properly using an LFS-8.4          platform.

Package Information

NFS Utilities Dependencies

Required

libtirpc-1.1.4, rpcsvc-proto-1.4        

Optional

LVM2-2.03.02 (libdevmapper for NFSv4 support),          libnfsidmap          (for NFSv4 support), libnsl-1.2.0 (for NIS client support), SQLite-3.28.0, MIT Kerberos          V5-1.17 or libgssapi,          and librpcsecgss          (for GSS and RPC security support) and libcap-2.27          with PAM        

Required (runtime)

rpcbind-1.2.5        

User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/nfs-utils        

Kernel          Configuration

Enable the following options in the kernel configuration (choose          client and/or server support as appropriate) and recompile the          kernel if necessary:

File systems  --->
  [*] Network File Systems  --->         [CONFIG_NETWORK_FILESYSTEMS]
    <*/M> NFS client support             [CONFIG_NFS_FS]
    <*/M> NFS server support             [CONFIG_NFSD]

       

Select the appropriate sub-options that appear when the above          options are selected.

[Note]          

Note

In BLFS we assume that nfs v3 will be used. If the server offers nfs v4 (for linux,            CONFIG_NFSD_V4) then auto-negotiation for v3 will fail and you            will need to add nfsver=3 to the            mount options. This also applies if that option is enabled in the            client's kernel, for            example in a distro trying to mount from a BLFS v3 server.

Even if neither end of the connection supports nfs v4, adding            nfsver=3 is still beneficial because            it prevents an error message "NFS: bad mount option value            specified: minorversion=1" being logged on every mount.

Installation          of NFS Utilities

Before you compile the program, ensure that the nobody user and nogroup group have been created as done in the          current LFS book. You can add them by running the following          commands as the root user:

groupadd -g 99 nogroup &&
useradd -c "Unprivileged Nobody" -d /dev/null -g nogroup \
    -s /bin/false -u 99 nobody

       

[Note]          

Note

The classic uid and gid values are 65534 which is also -2 when            interpreted as a signed 16-bit number. These values impact other            files on some filesystems that do not have support for sparse            files. The nobody and            nogroup values are relatively            arbitrary. The impact on a server is nil if the exports file is configured correctly. If it is            misconfigured, an ls            -l or ps listing will show a uid or            gid number of 65534 instead of a name. The client uses            nobody only as the user running            rpc.statd.

Install NFS Utilities by running          the following commands:

./configure --prefix=/usr          \
            --sysconfdir=/etc      \
            --sbindir=/sbin        \
            --disable-nfsv4        \
            --disable-gss &&
make

       

This package does not come with a working test suite."

Now, as the root user:

make install                      &&
mv -v /sbin/start-statd /usr/sbin &&
chmod u+w,go+r /sbin/mount.nfs    &&
chown nobody.nogroup /var/lib/nfs

     

Command Explanations

--disable-nfsv4: This          allows the package to be built when libnfsidmap has not been          installed.

--disable-gss: Disables          support for RPCSEC GSS (RPC Security).

chown nobody.nogroup          /var/lib/nfs: The rpc.statd program uses the          ownership of this directory to set it's UID and GID. This command          sets those to unprivileged entries.

Configuring NFS Utilities

Server Configuration

/etc/exports contains the exported            directories on NFS servers. Refer to the exports.5 manual page for the syntax of this            file. Also refer to the "NFS HowTo" available at http://nfs.sourceforge.net/nfs-howto/            for information on how to configure the servers and clients in a            secure manner. For example, for sharing the /home directory over the local network, the            following line may be added:

cat >> /etc/exports << EOF/home 192.168.0.0/24(rw,subtree_check,anonuid=99,anongid=99)
EOF

         

[Note]            

Note

Be sure to replace the directory, network address. and prefix              above to match your network. The only space in the line above              should be between the directory and the network address.

Boot Script                  

Install the /etc/rc.d/init.d/nfs-server init              script included in the blfs-bootscripts-20190524 package to              start the server at boot.

make install-nfs-server

           

Now create the /etc/sysconfig/nfs-server configuration file:

cat > /etc/sysconfig/nfs-server << "EOF"PORT="2049"
PROCESSES="8"
KILLDELAY="10"EOF

           

[Note]              

Note

The above parameters may be optionally placed in /etc/sysconfig/rc.site.

Client Configuration

/etc/fstab contains the directories            that are to be mounted on the client. Alternately the partitions            can be mounted by using the mount command with the proper            options. To mount the /home and            /usr partitions, add the following            to the /etc/fstab:

<server-name>:/home  /home nfs   rw,_netdev 0 0<server-name>:/usr   /usr  nfs   ro,_netdev 0 0

         

The options which can be used are specified in man 5 nfs. If both the client            and server are running recent versions of linux, most of the            options will be negotiated (but see the Note above on nfsver=3).            You can specify either rw or            ro, _netdev if the filesystem is to be automatically            mounted at boot, or noauto (and            perhaps user) for other filesystems.

If the fileserver is not running a recent version of linux, you            may need to specifiy other options.

If you are using systemd, you may need to enable autofs v4 in            your kernel, and add the option comment=systemd.automount. Some machines need            this, because systemd tries to mount the external fs's before the            network is up, others do not need it. An alternative is for            root to run mount -a.

Boot Script                  

[Note]              

Note

The following boot script is not required if the                nfs-server script is installed.

Install the /etc/rc.d/init.d/nfs-client init              script included in the blfs-bootscripts-20190524 package to              start the client services at boot.

make install-nfs-client

           

To automatically mount nfs              filesystems, clients will also need to install the netfs bootscript as described in Configuring for Network              Filesystems.

Contents

Installed Programs:              exportfs, mountstats, mount.nfs,              mount.nfs4 (link to mount.nfs), nfsiostat, nfsstat, osd_login,              rpc.mountd, rpc.nfsd, rpc.statd, rpcdebug, showmount,              sm-notify, start-statd, umount.nfs (link to mount.nfs), and              umount.nfs4 (link to mount.nfs)            

Installed Libraries:              None            

Installed Directories:              /var/lib/nfs            

Short Descriptions

exportfs                  

maintains a list of NFS exported file systems.

mountstats                  

displays NFS client per-mount statistics.

mount.nfs                  

is used to mount a network share using NFS

mount.nfs4                  

is used to mount a network share using NFSv4

nfsiostat                  

reports input/output statistics for network filesystems.

nfsstat                  

displays statistics kept about NFS client and server                    activity.

osd_login                  

is a script that is a part of the autologin feature                    mandated by the pnfs-objects standard.

rpc.mountd                  

implements the NFS mount protocol on an NFS server.

rpc.nfsd                  

implements the user level part of the NFS service on the                    server.

rpc.statd                  

is used by the NFS file locking service. Run on both                    sides, client as well as server, when you want file                    locking enabled.

rpcdebug                  

sets or clears the kernel's NFS client and server debug                    flags.

showmount                  

displays mount information for an NFS server.

sm-notify                  

is used to send Network Status Monitor reboot messages.

start-statd                  

is a script called by nfsmount when mounting a filesystem                    with locking enabled, if statd does not appear to be                    running. It can be customised with whatever flags are                    appropriate for the site.

umount.nfs                  

is used to unmount a network share using NFS

umount.nfs4                  

is used to unmount a network share using NFSv4

Last updated on 2019-05-12 07:09:13 -0500


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