On 21 Sep 2010, at 21:12, Mathew Hennessy wrote:
> Hi,
> Is there a way to guarantee changes to relevant fstab NFS mount flags
> when made in a body mount? So far, I have to umount the dirs and delete
> them from fstab on the client for a cf-agent run to repopulate fstab
> with the changed flags.
In cfengine 2 I use a shellcommand to remount the filesystem if the current
entries in mtab don't match the desired properties. I'm not using cfengine's
mount stuff in cfengine 2, but doing it manually. Here's a subset of what I do:
control:
any::
actionsequence = ( editfiles shellcommands )
fstab = ( A(source,"software-${datacentre}:/vol/software_copy/general")
A(mntpnt,"/vol/software")
A(fstype,"nfs")
A(mode,"ro")
A(options,"vers=3,tcp,rsize=32768,wsize=32768,timeo=600,hard,intr") )
fstab_line = ( "${fstab[source]} ${fstab[mntpnt]} ${fstab[fstype]}
${fstab[options]},${fstab[mode]} 0 0" )
editfiles:
linux::
{ /etc/mtab
BeginGroupIfLineMatching "${fstab[source]} ${fstab[mntpnt]} nfs .*"
DefineInGroup "correct_fs_mounted"
BeginGroupIfLineMatching "${fstab[source]} ${fstab[mntpnt]} nfs
${fstab[mode]},.*"
DefineInGroup "correct_readorwrite"
EndGroup
EndGroup
}
{ /etc/fstab
BeginGroupIfNoLineMatching "${fstab_line}.*"
DeleteLinesContaining " ${fstab[mntpnt]} "
Append "${fstab_line}"
EndGroup
}
shellcommands:
linux.correct_fs_mounted.!correct_readorwrite::
"/bin/mount -o remount,${fstab[mode]} ${fstab[mntpnt]}"
linux.!correct_fs_mounted::
"/bin/umount -l ${fstab[mntpnt]}"
"/bin/mount ${fstab[mntpnt]}"
All does the job quite nicely, and because it uses a lazy unmount if the
mounted filesystem is wrong, no running processes are adversely affected if the
desire fileserver changes.
Regards,
Tim
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