autmounts

[Richard Hubbard]

Talk about timeliness!
I don't know what prompted this post, but this
answered a couple of questions I had.  I'm usually
used to 'Ask question first, wait for answer'  This
one seems to have been backwards... Answer came first,
before I could ask a question!

feel free to continue!


--- Darin Perusich <Darin.Perusich at cognigencorp.com>
wrote:
> automounts are nfs mounted filesystems that are only
> mounted when the 
> resource is requested, and unmounted after a period
> of inactivity. it 
> can also be used for cd's, floppies, etc.
> 
> example, your home directory resides on
> nfsserver:/export/home/luser, 
> when you login on server1 it makes a request for 
> nfsserver:/export/home/luser which is mounted at
> server1:/home/luser. 
> when you logoff after about 5 minutes
> server1:/home/luser umounts 
> /home/luser.
> 
> automount's default config file is /etc/auto.master
> in linux. in solaris 
> it's slightly different but i'm not going to get
> into that. the default 
> might look like "/misc   /etc/auto.misc 
> --timeout=60". this means mount 
> everthing listed in /etc/auto.misc under /misc, with
> a timeout of 60 
> seconds.
> 
> currently linux automount does NOT support direct
> mount points, i.e. 
> mount nfsserver:/export/share1 /share1. automount
> mounts is at 
> /misc/share1, we can get around this little issue by
> using softlinks, 
> "cd / && ln -s /misc/share1".
> 
> auto.misc might look like:
> share1	nfs1:/export/share1
> share2	nfs1:/export/share2	nfs2:/export/share2
> 
> this would mount share1 as /misc/share1 and share2
> as /misc/share2. the 
> share2 mount is an example of redundancy. if nfs1
> fails to respond try 
> nfs2, etc. this of course would require redundant
> systems attached to 
> some type of external disk, dual-channel scsi array,
> SAN, cluter 
> filesystems.
> 
> Joe, this is what i would do given your config. do
> this on a test 
> machine before doing it on your webserver,
> especially if this is a 
> work/production environment. you should also
> understand how it works 
> before you implement it.
> 
> /etc/auto.master
> 	uncomment the line "/misc   /etc/auto.misc 
> --timeout=60"
> 
> /etc/auto.misc
> 	remove/comment unwanted entries. add the lines.
> 		(change IP to hostname)
> 	db	192.168.1.3:/nfs-srv/db
> 	isp	192.168.1.3:/nfs-srv/isp
> 	users	192.168.1.3:/nfs-srv/user
> 
> create softlinks
> 	cd / && ln -s /misc/db
> 	cd / && ln -s /misc/ips
> 	cd / && ln -s /misc/users
> 
> stop and start autofs (stop just to be safe)
> 	/etc/init.d/autofs stop && /etc/init.d/autofs start
> 
> did the filesystems mount as expected?
> 
> enjoy.
> 
> -- 
> Darin Perusich
> Unix Systems Administrator
> Cognigen Corp.
> darinper at cognigencorp.com
> 
> 


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