DragonFly users List (threaded) for 2011-10
Re: UFS in CF for /boot and Hammer for the rest and failover+load balancing
Regarding disk encryption, there are basically two approaches now.
One is tcplay(8), which is a TrueCrypt compatible BSD-licensed solution,
but fairly experimental.
The more stable/well tested solution is the GPL-licensed cryptsetup(8),
which is the same as on Linux.
Both use dm_target_crypt underneath and both are fully supported for
cryptdisks(8), crypttab(5) and mkinitrd(8).
Using the initrd approach you can encrypt your / with any of the above
approaches, but /boot needs to be unencrypted.
On 03/10/11 08:15, Zenny wrote:
> Thank you Justin for a comprehensive reply. Appreciate it!
> I shall check with the vkernel stuffs to limit resources for jails
> (seems like a sharp learning curve ;-) )
> Since you stated that 4 drives are overkill, does hammer allow
> create a pool like in ZFS of two master drives and two slave drives
> with remote machine which works exactly as a failover + load
> balancing (as in the case of DRBD in Linux or HAST in the coming
> Where exactly can find the detailed document for scripting for a
> streaming the HAMMER data to the remote machines?
> As I stated earlier, I want:
> /boot in CF or SanDisk
> / in HDD and other data
> swapcahce in SSD or in HAMMER /
> in order to separate data from the operating system. But I could
> not find documents for manual installation mode to meet my
> requirements. Let me know if there are any. Thanks!
> On Sun, Oct 2, 2011 at 11:50 PM, Justin Sherrill
> <email@example.com <mailto:firstname.lastname@example.org>> wrote:
> I'm not sure about the jails. They I think work the same on
> DragonFly, though the resource limits aren't there. You could
> potentially use virtual kernels to get a similar effect. See the
> vkernel man page for that.
> You should be able to set up the root and other volumes normally. 4
> hard drives may be overkill - you can stream from master to slave
> volumes in Hammer, for which 2 drives will work. If you want more
> duplication, hardware RAID may be a good idea; people have been trying
> out Areca cards with success recently.
> AES256 is supported, or at least I see the tcplay(8) man page has an
> example using it. I haven't used disk encryption enough to know it
> You can use Hammer to stream data to other machines, and then in the
> event of something going wrong, promote the slave drive in the
> surviving unit to master. This would require some scripting or manual
> intervention; this isn't covered with an automatic mechanism.
> On Sun, Oct 2, 2011 at 5:50 AM, Zenny <email@example.com
> <mailto:firstname.lastname@example.org>> wrote:
> > Hi:
> > I am pretty new to Dragonfly or BSD world. HammerFS seems to be very
> > innovative. Thanks to Matt and team for their hard work.
> > I would like to do something with Hammer+UFS like the following,
> > inspired by Paul's work
> > (http://www.psconsult.nl/talks/NLLGG-BSDdag-Servers/), but could not
> > figure out exactly:
> > 1) Creation of a server with a jail with minimal downtime as offered
> > by nanobsd scripts in FreeBSD. Two failover kernels. Is there such
> > scripts for DragonflyBSD?
> > 2) I want to have the minimal boot (ro UFS) and configurations like
> > that of the nanobsd image on a compact flash while the entire root and
> > data in an array of HDDs (at least 4) with of course an SSD for
> > swapcache. The latter could be Hammer to avoid softraid.
> > 3) All HDDs should be encrypted with AES256 (I could not find whether
> > DragonflyBSD supports that), and accessible either in the /boot of CF
> > or somewhere else (could be ssh tunneled from another network).
> > 4) I could not figure out the features of jail available for
> > DragonflyBSD. FreeBSD-9-CURRENT has the resource containers
> > (http://wiki.freebsd.org/Hierarchical_Resource_Limits). Are they
> > applicable in DragonflyBSD's case.
> > 5) Is there any way that the two similar servers in two different
> > locations can securely mirror for failover as well as load-balancing?
> > Appreciate your thoughtful inputs! Apology in advance if my post above
> > appears to be pretty naive. Thanks in advance to the entire DF
> > community and developers!
> > zenny