Date: Mon, 16 Feb 2015 20:56:55 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: Beeblebrox <zaphod@berentweb.com> Cc: freebsd-net@freebsd.org Subject: Re: NFS and diskless: some questions re nfs_diskless.c Message-ID: <2127899926.4385980.1424138215864.JavaMail.root@uoguelph.ca> In-Reply-To: <20150217013256.668aa838@rsbsd.rsb>
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Beeblebrox wrote:
> Well, I removed all the BOOTP* items from config and re-built kernel.
>
> * With FreeBSD's pxeboot everything works normally and root is
> mounted as NFSv3. dhcp.conf has option root-path defined.
>
> * When trying to use Grub, boot stops at the "mountroot>" prompt,
> wich was the original problem as far as I recall. The grub.cfg file
> already passes these params to the FreeBSD kernel to no avail:
> vfs.root.mountfrom="nfs:192.168.2.1:/data/amd64"
I believe the syntax for this is:
vfs.root.mountfrom=nfs:/data/amd64
but I'm not sure.
Here`s the comment from vfs_mountroot.c for this:
* The root filesystem is detailed in the kernel environment variable
72 * vfs.root.mountfrom, which is expected to be in the general format
73 *
74 * <vfsname>:[<path>][ <vfsname>:[<path>] ...]
75 * vfsname := the name of a VFS known to the kernel and capable
76 * of being mounted as root
77 * path := disk device name or other data used by the filesystem
78 * to locate its physical store
79 *
80 * If the environment variable vfs.root.mountfrom is a space separated list,
81 * each list element is tried in turn and the root filesystem will be mounted
82 * from the first one that suceeds.
83 *
84 * The environment variable vfs.root.mountfrom.options is a comma delimited
85 * set of string mount options. These mount options must be parseable
86 * by nmount() in the kernel.
> boot.nfsroot.server="192.168.2.1"
> boot.nfsroot.path="/data/amd64"
>
These 2 lines cover the information and are used for NFS_ROOT.
(I'd just get rid of vfs.root.mountfrom if you are going to use
NFS_ROOT.)
>From nfs_diskless.c, here is the list of environment variables used
by the NFS_ROOT case:
* Populate the essential fields in the nfsv3_diskless structure.
147 *
148 * The loader is expected to export the following environment variables:
149 *
150 * boot.netif.name name of boot interface
151 * boot.netif.ip IP address on boot interface
152 * boot.netif.netmask netmask on boot interface
153 * boot.netif.gateway default gateway (optional)
154 * boot.netif.hwaddr hardware address of boot interface
155 * boot.nfsroot.server IP address of root filesystem server
156 * boot.nfsroot.path path of the root filesystem on server
157 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
158 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only)
159 * boot.nfsroot.options NFS options for the root filesystem
Alternately, set vfs.root.mountfrom and put all three of these
options back in your kernel config.
options BOOTP
options BOOTP_NFSROOT
options BOOTP_NFSV3 <-- this one gets the BOOTP* case to use NFSv3
rick
ps: All I do when trying to answer these questions is look in the sources.
(To me, that`s what open source is all about.)
> --
> FreeBSD_amd64_11-Current_RadeonKMS
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