NFS Utilities

Download Source:	http://www.kernel.org/pub/linux/utils/nfs/nfs-utils-1.2.8.tar.bz2

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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.

Project Homepage: Unknown

Dependencies

Required

• Portmap

Optional for NFSv4 Support

• Pkg-config
• libevent
• libnfsidmap
• keyutils

Optional for GSS (RPC Security) Support

• Pkg-config
• libgssapi
• librpcsecgss
• MIT krb5
• SPKM-3 for Additional SPKM-3 Support

Creating the nobody/nogroup User/Group

groupadd -g 65533 nogroup &&
groupadd -g 65534 nobody &&
useradd -c "Nobody" -d /dev/null \
        -u 65534 -g nobody -s /bin/false nobody

Non-Multilib

Compile the package:

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

Install the package

make install &&
install -dv -m755 /var/lib/nfs/rpc_pipefs

Multilib

This package does not install any libraries so only one installation is needed.

64Bit

Compile the package:

CC="gcc ${BUILD64}" PKG_CONFIG_PATH="${PKG_CONFIG_PATH64}" USE_ARCH=64 \
./configure --prefix=/usr --sysconfdir=/etc \
    --disable-nfsv4 --disable-gss &&
make

Note

If you choose to enable NFSv4, drop both --disable flags, and append --with-gssglue. To work around some documented behaviour in libtool that will cause your build to subtly fail, prepend GSSGLUE_CFLAGS="-Wl,-lgssglue" to the start of your configure line.

Install the package

make install &&
install -dv -m755 /var/lib/nfs/rpc_pipefs

Configuring

Note if you install the nfs-server bootscript you dont need to install the nfs-client bootscript.

Note

This is a note about NFSv4 & Kerberos.

Make sure that your clocks are in sync. If the time differers by more then 5 minutes, you will not authenticate even with the correct password / key.

You must also have a working DNS & Reverse DNS Zones. If your FQDN for your host resolves to 127.0.0.1 Kerberos will not work properly either.

If you're using nfs4 you should also have host/<fqdn of client>@<REALMNAME.COM> in your /etc/krb5.keytab as well as nfs/<fqdn of client>@<REALMNAME.COM>.

Client

NFSv4

Make sure that you have your Kerberos KDC setup then add a client key, then export it to a temporary keytab Each client gets its own keytab for nfs:

kadmin.local -q "addprinc -randkey <fqdn of client>@<REALMNAME.COM>"
kadmin.local -q "ktadd -e aes256-cts-hmac-sha1-96:normal -k temp.keytab nfs/<fqdn of client>@<REALMNAME.COM>"

Now securely move temp.keytab to /etc/krb5.keytab on the client. Then make sure you change the permissions on the file on the target computer:

chmod 600 /etc/krb5.keytab

If you already have a krb5.keytab on the target computer you can merge the two together with the ktutil command.

Keyutils for NFSv4

Configure /etc/request-key.conf using:

cat >> /etc/request-key.conf << "EOF"
create	id_resolver	*	*	/usr/sbin/nfsidmap -t 600 %k %d
EOF

This will allow NFSv4's ID Mapping service to run.

Bootscript

Install the init script from the bootscripts package:

make install-nfs-client

Create the default configuration file with the following command:

cat > /etc/sysconfig/nfs-client << "EOF"
# Begin /etc/sysconfig/nfs-client

# Change the following line to NFS4=yes if you wish to use nfs4.
NFS4=no

# End /etc/sysconfig/nfs-client
EOF

/etc/fstab

Below are 2 example entries in /etc/fstab for a nfs mounted /home and /usr.

<server-name>:/home  /home nfs   rw,_netdev,rsize=8192,wsize=8192 0 0
<server-name>:/usr   /usr  nfs   ro,_netdev,rsize=8192            0 0

<server-name> in the above example is an ip address or a hostname.

Example equivilent NFSv4 entries with the /home mount using Krb5 for security:

<server-name>:/home  /home nfs4  rw,_netdev,sec=krb5,hard,intr    0 0
<server-name>:/usr   /usr  nfs4  ro,_netdev,sec=sys,hard,intr     0 0

Server

NFSv4

Make sure that you have your Kerberos KDC setup then add a client key, then export it to a temporary keytab:

kadmin.local -q "addprinc -randkey <fqdn of client>@<REALMNAME.COM>"
kadmin.local -q "ktadd -e aes256-cts-hmac-sha1-96:normal -k temp.keytab nfs/<fqdn of client>@<REALMNAME.COM>"

Now securely move temp.keytab to /etc/krb5.keytab on the client. Then make sure you change the permissions on the file on the target computer:

chmod 600 /etc/krb5.keytab

If you already have a krb5.keytab on the target computer you can merge the two together with the ktutil command.

Bootscript

Install the init script from the bootscripts package:

make install-nfs-server

Create the default configuration file with the following command:

cat > /etc/sysconfig/nfs-server << "EOF"
# Begin /etc/sysconfig/nfs-server

# Change the following line to NFS4=yes if you wish to use nfs4.
NFS4=no

PORT="2049"
PROCESSES="8"
QUOTAS="no"
KILLDELAY="10"

# End /etc/sysconfig/nfs-server
EOF

Server Configuration

/etc/exports contains the exported directories on NFS servers. The "NFS HowTo", http://nfs.sourceforge.net/nfs-howto/. contains information on how to configure the servers and clients. For example, for sharing the /home directory over the local network, the following line may be added:

/home 192.168.0.0/255.255.255.0(rw,subtree_check,anonuid=99,anongid=99)