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Full Discussion: NIS question
Top Forums UNIX for Dummies Questions & Answers NIS question Post 29319 by RTM on Thursday 3rd of October 2002 10:56:38 AM
Old 10-03-2002
In how you asked the question - no, it can not be done. Not without cluster-style software that would be able to automatically use the other array. The other problem (which could be solved with cluster-style software) is the NIS Master not being there. If you are looking for an automated solution, some type of cluster software is needed.

One way to do it without cluster-style software - bring up the IP address of the NIS master on the slave and set the slave to become the master with the array attached to it (either a second array or the original via second path). If it's a different array, then data will need to be updated nightly. Writing scripts to do all this can be done, it just isn't as accurate as cluster style software. Getting all the software/scripts to work properly and not bring up the slave as a master by mistake in the middle of the day (when there is nothing wrong with the master) may be a nightmare you don't want.

Another way to do this without cluster-style software - your original (NFS) home directories mounted over /export/home/user. If the NFS mount can't happen, you could then use a default /export/home/user which would be local. This would work but would be a royal pain as far as administration.

(Single user mode)
# ls -a /export/home/myuser
.profile README.nofiles

(Multi-user with NFS working)
#ls -a /export/home/myuser
.dt .profile myfiles.txt

If NFS isn't working then the user would have minimal files in their home directory. The real problem is when the NFS mounts start working (folks could 'lose' files - files would be there, just not accessable - but if your looking for a D/R solution to just get folks working, it could be done this way).


These are just ideas - none of which I have seen work or implemented - I've always been lucky enough to put the fear of loss data into the right people to make them buy the correct software for the redundancy they say they require. That is always the best way to go if this is truely a mission critical server.
 

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LEARN ABOUT X11R4

nfsmount.conf

NFSMOUNT.CONF(5)						File Formats Manual						  NFSMOUNT.CONF(5)

NAME

       nfsmount.conf - Configuration file for NFS mounts

SYNOPSIS

       Configuration file for NFS mounts that allows options to be set globally, per server or per mount point.

DESCRIPTION

       The  configuration  file  is  made  up  of multiple sections followed by variables associated with that section.  A section is defined by a
       string enclosed by [ and ] branches.  Variables are assignment statements that assign values to particular variables using the =  operator,
       as in Proto=Tcp.  Sections are broken up into three basic categories: Global options, Server options and Mount Point options.

       [ NFSMount_Global_Options ] - This statically named section defines all of the global mount options that can be applied to every NFS mount.

       [  Server  "Server_Name"  ]  -  This  section  defines  all the mount options that should be used on mounts to a particular NFS server. The
	      "Server_Name" strings needs to be surrounded by '"' and be an exact match of the server name used in the mount command.

       [ MountPoint "Mount_Point" ] - This section defines all the  mount  options  that  should  be  used  on	a  particular  mount  point.   The
	      "Mount_Point" string needs to be surrounded by '"' and be an exact match of the mount point used in the mount command.

EXAMPLES

       These are some example lines of how sections and variables are defined in the configuration file.

       [ NFSMount_Global_Options ]
	   Proto=Tcp

	      The TCP protocol will be used on every NFS mount.

       [ Server "nfsserver.foo.com" ]
	   rsize=32k
	   wsize=32k

	      A 33k (32768 bytes) block size will be used as the read and write size on all mounts to the 'nfsserver.foo.com' server.

	[ MountPoint "/export/home" ]
	   Background=True

	      All mounts to the '/export/home' export will be performed in the background (i.e. done asynchronously).

FILES

       /etc/nfsmount.conf
		 Default NFS mount configuration file

SEE ALSO

       nfs(5), mount(8),

								    9 Mar 2008							  NFSMOUNT.CONF(5)
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