devfs and late file systems

[Matthew Seaman]

On 23/11/2013 02:06, Daniel Gerzo wrote:
> Hello,
> 
> I am using a root on zfs setup with mounts handled by zfs itself (i.e.
> not legacy mountpoints through fstab). Furthermore I am using service
> jails to separate things. I am running named in one of such jails.
> Obviously I need devfs, and therefore I have added this to my fstab:
> 
> devfs /jails/named/var/named/dev devfs rw,late 0 0
> 
> I had to add the late keyword to fstab because without it the system
> wouldn't boot because fstab mounts (mountcritlocal rc.d script) are
> handled just before zfs and as such the system wouldn't have such path
> available yet.
> 
> Moreover, named needs only a few dev entries and as such I wanted to
> apply my devfs ruleset, so I added this to rc.conf:
> 
> devfs_set_rulesets="/jails/named/var/named/dev=devfsrules_named"
> 
> However, this fails during system startup because when the devfs rc.d
> script is run, the filesystems marked as late are not mounted yet.
> 
> There are two obvious options to fix this issue:
> - we can either move zfs before mountcritlocal which would also fix this
> issue with having to use the late filesystems in fstab, or
> - we can move mountlate before devfs.
> 
> I guess the second option is safer (just add mountlate to REQUIRE: line
> of devfs) but I may be missing something. Can someone fix this in src,
> or should I?
> 
> Thank you!
> 
> PS: I am not subscribed to this list so please keep me cc:ed
> 

Assming your jail is tagged as 'named' in rc.conf, create a file
/etc/fstab.named with your devfs mount details in there.  Then add

   jail_mount_enable="YES"   (applies to all jails)

or

   jail_named_mount_enable="YES"  (just for that jail)

/etc/rc.d/jail will mount the contents of /etc/fstab.named at jail
startup time, which is well after all the zfs mounts have happened.

See rc.conf(5) for details.
	
	Cheers,

	Matthew


-- 
Dr Matthew J Seaman MA, D.Phil.

PGP: http://www.infracaninophile.co.uk/pgpkey
JID: matthew at infracaninophile.co.uk

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