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Date:      Sun, 15 Nov 2009 23:47:10 +0200 (EET)
From:      Mario Pavlov <freebsd@abv.bg>
To:        Tim Judd <tajudd@gmail.com>
Cc:        freebsd-stable@freebsd.org, freebsd-questions@freebsd.org
Subject:   Re: Re: diskless - NFS root mount problem
Message-ID:  <120653617.10492.1258321630563.JavaMail.apache@mail53.abv.bg>

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 Hi Tim,
thanks a lot for your answer, I'll try that out tomorrow.

cheers,
mgp

 >
 >
 >Please compare my working configuration to yours to check.  I found
 >lots of odd problems in your post and I thought it'd be best to just
 >run with this clean slate.
 >
 >Network config:
 >  One low-power PC Engines ALIX board running as the NFS server, with
 >a microdrive partitioned off for it's own system, plus a separate
 >mounted partition for diskless clients.  This config works best with
 >one diskless client, and is not the documented way from FreeBSD
 >handbook to accomplish diskless workstations.  I'll note what I
 >immediately saw as an error in your config during these snippets.
 >
 >alix# bsdlabel /dev/ad0s1
 ># /dev/ad0s1:
 >8 partitions:
 >#        size   offset    fstype   [fsize bsize bps/cpg]
 >  a:  1048576       16    4.2BSD     2048 16384     8
 >  c: 12000177        0    unused        0     0         # "raw" part, don't edit
 >  h: 10951585  1048592    4.2BSD     2048 16384 28552
 >
 >alix# cat /etc/fstab
 >/dev/ad0s1a             /               ufs     rw              0 0
 >/dev/ad0s1h             /diskless       ufs     rw              0 0
 >
 >alix# cat /etc/exports
 >/diskless       -maproot=0:0    -network 192.168.0.0 -mask 255.255.255.0
 >
 >*** maproot needs a user and group definition.
 >
 >alix# cat /etc/rc.conf
 >rpcbind_enable="YES"
 >nfs_server_enable="YES"
 >rpc_statd_enable="YES"
 >rpc_lockd_enable="YES"
 >
 >*** rpc_lockd provides file locking, rpc_lockd depends on rpc_statd
 >
 >
 >************** Diskless side
 >
 >*** I believe the root filesystem information is passed on from dhcp,
 >to pxeboot, to the kernel, in order to mount the root filesystem.  You
 >can have a 0-size fstab file for read-write access, or provide the
 >read-only nfs root here.  If you want it read only, it's best to
 >specify it here, such as below
 >
 >alix# cat /diskless/etc/fstab
 >192.168.0.1:/diskless / nfs ro 0 0
 >
 >alix# cat /diskless/etc/rc.conf
 >rpcbind_enable="YES"
 >nfs_client_enable="YES"
 >rpc_statd_enable="YES"
 >rpc_lockd_enable="YES"
 >
 >*** File locking needed lockd/statd support on the client, also.
 >Think of editing /etc/passwd (the proper way) when you need file
 >locking.
 >
 >
 >
 >
 >This will result in a basic, 1-workstation diskless setup working.
 >The difference is that the FreeBSD rc startup looks for a /conf
 >directory which can provide multiple overrides to multiple
 >workstations.  I tried setting up a livecd with a /conf directory only
 >to find that the /conf is checked, no matter which medium it's booting
 >off of.
 >
 >This config does NOT cover the DHCP scope, TFTP, IPs or other settings
 >that might be pertinent to booting diskless-ly.
 >
 >Note that by sharing your exact / filesystem as an export is a bad
 >idea.  It will essentially create a NFS server on a NFS server round
 >robin and probably won't connect.  It's why you setup a separate
 >partition (EVEN if it's a file-backed filesystem mounted with the help
 >of mdconfig on a separate mountpoint on your filesystem).
 >
 >Once you revise your config, please try again.
 >
 >
 >--Tim
 >

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