redhat and rc.d issues ...

[dsr-mzpnVDyJpH4k7aNtvndDlA at public.gmane.org (Dan Ritter)]

On Mon, Jun 28, 2010 at 10:49:37AM -0400, theBlueSage wrote:
> Hi folks,
> 
> For my startup/init process (/etc/rc.d/rc3.d/), I have S60NFS followed
> by S85httpd and S85tomcat. If for some reason the NFS mounts
> from /etc/fstab fail, and tomcat and httpd startup without access to the
> NFS mounted file system, then tomcat can get into a mess as my default
> program running in tomcat requires indexes that are in the NFS
> partitions.
> 
> Is there any way that I can tell the startup process to _not_start httpd
> and tomcat if the nfs mounts fail, or is this the kind of thing that
> should be handled at program level?
> 
> I see in the net/free BSD versions on rc.d that there are
> "PROVIDE/REQUIRE" type switched that can be added to scripts
> in /etc/init.d that make sure certain processes are started before
> others, but I dont see any linux (or more specifically redhat)
> references to such options ...

Well, the obvious thing to do is to have tomcat and httpd
scripts check for the existence of a particular file on the NFS
mountpoint.

if [ ! -f /mount/filesystem/knownfile ]; then
	echo "can't find knownfile; is NFS mounted? \n"
	date | mail -s "NFS mount problem on $HOST" alerts-QZmI/2vgwZVWk0Htik3J/w at public.gmane.org
	exit 99
fi

or similar.

If NFS is critical, you will also want to monitor it regularly.

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