Ammasso 1100 Uživatelská příručka stáhnout pdf (Strana 62)

7.8.1 Configure a Root File System

The idea behind a diskless node is to use the distribution that has been installed on a remote

server via NFS. We used a two step process to create the root file system for a client on the

server.

1. Copy all files from the distribution installed on a disk into a directory on the server.

NFSROOT=/NFSroot/clients/OS/client1. The directory

/NFSroot/clients/OS/client1 is the distribution root directory. In addition,

create a directory /NFSroot/clients/OS/client1/initrd since we make

use of this in the ramdisk with pivot_root.

2. Prepare the copied distribution directory for network booting.

a. Replace the entry for / in ${NFSROOT}/etc/fstab with

none / tmpfs defaults 0 0

This will prevent an fsck.ext2

b. Ensure that all NFS mounts in ${NFSROOT}/etc/fstab have the

nolock option turned on.

c. Disable networking (we set this up in the ramdisk over AMSO1100)

/usr/sbin/chroot ${NFSROOT} /sbin/chkconfig \

--del network

d. Create the following symbolic links since /etc will be read-only

ln -sf /proc/mounts ${NFSROOT}/etc/mtab

ln -sf /var/resolv.conf \

${NFSROOT}/etc/resolv.conf

More info on creating NFS root filesystems can be obtained at:

http://www.tldp.org/HOWTO/NFS-Root-Client-mini-HOWTO/

7.8.2 Configure the NFS Server

The NFS server should export the distribution directory. Add a line like this to your

/etc/exports on the NFS server:

/NFSroot/clients/OS/client1 \

10.40.48.0/255.255.0.0(ro,no_root_squash)

Run /usr/sbin/exportfs -ra after you have added the line and restart the NFS

daemon. This directory should not be mounted in read-write mode since you need to set

no_root_squash.

More info on configuring an NFS server can be found at the following web site:

http://www.tldp.org/HOWTO/NFS-HOWTO/

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Ammasso 1100 Uživatelská příručka Strana 62