168.1.67'
nfs_root = '/mnt/feisty'
root = '/dev/nfs'
EOF
21. Start up the Ubuntu Feisty domain using xm:
# xm create ubuntu_feisty_nfs_domU.cfg ??“c
What Just Happened?
In this section we set up a directory to be exported via NFS from a remote server.
We then installed Ubuntu Feisty Fawn into this directory using debootstrap. The
configuration file for the domain specified the various parameters necessary for
Xen to recognize that the guest domain will be using NFS for boot up. This enables
you to consolidate some of your storage requirements. However, keep in mind the
following when using NFS:
The restrictions on the exported directories must be set very carefully to
ensure that access is only provided to the right servers.
NFS is quite fast, but it still has to deal with the overhead of creating and
closing network connections and transferring data over the network. If speed
is of paramount importance to your Xen domains, NFS is not the way to go.
??? ???
Chapter 6
[ 93 ]
There are a couple of different versions of NFS??”NFS v3 and NFS v4. You
will need to examine their features carefully to determine which one will be a
better fit for your needs.
The following links provide more information on NFS:
NFS how to: http://nfs.sourceforge.net/nfs-howto/
Understanding NFS: http://www.onlamp.com/lpt/a/1548
Logical Volume Management
LVM is a partitioning scheme designed to be more flexible than normal physical disk
partitioning. It allows changes in the size of individual volumes without a reboot,
and, in most cases, while the file system on the volume is being actively used.
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