The first step towards treating NFS filesystems as network resources is
to invent a naming scheme so that every filesystem has a unique name on
which it can be mounted. If we don't sort this out now, we could find
two or more hosts with a filesystem called /usr/local
, both of
which we might like to mount since they contain different software.
A simple but extremely useful naming scheme is the following. (2) If you don't like this scheme you can invent your own, but the remainder of the text will encourage you to use this one. If you follow this scheme, exactly as described here, you will never have any problems with mount points. We shall describe the scheme in detail below. Here are some points to digest:
Each filesystem is given a directory name composed of three parts:
/site/host/contents
The first directory (which only exists to create a suitable mountpoint) is the name of your local site. If you are a physics department at a university (with a separate setup) you could call this `physics'. It could be your company name or whatever. The second piece is the name of the host to which the disk space is physically attached. The final piece is the name of the filesystem. Here are some typical examples:
/physics/einstein/local # /usr/local for einstein@physics /physics/newton/u1 # user partition 1 for newton@physics
On the machines which are home to the `local' partition, it is better to
make a link to /usr/local
than call the filesystem
/usr/local
directly. This is because it makes the procedure of
organizing the entire network much clearer.
It is worth noting that, when you ask cfengine to mount such a resource,
it will automatically make the mount directory and can easily be asked
to make a link to /usr/local
, so this small amount of extra work
is really no work at all.
The whole naming convention is compactly summarized by defining a mount point variable. See section mountpattern. With the present scheme, this can be defined as
mountpattern = ( /$(site)/$(host) )
so that it evaluates to the name of the host executing the file
regardless of who that may be. This variable is used together with the
homepattern
pattern variable, which is used to distinguish
between home directories and binary resources. See section HomePattern. You
can think of this as being part of the naming convention. In this text,
we use the convention u1 u2 u3...
for home disks. You could
equally well use home1 home2...
etc. As long as the name is
unique, it doesn't matter.
The full list of named resources should now be listed in the
mountables
list, which is simply a list of all the resources
available for mounting on the network. See section mountables.
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