Nfs root
From Attie's Wiki
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NFS root filesystems always seem to be fiddly to get setup. | NFS root filesystems always seem to be fiddly to get setup. | ||
There is an option '<code>nfsrootdebug</code>' that prints out debug messages, for example: | There is an option '<code>nfsrootdebug</code>' that prints out debug messages, for example: | ||
− | < | + | <source lang="text"> |
[ 4.674285] net eth0: SMSC911x/921x identified at 0xc8884000, IRQ: 336 | [ 4.674285] net eth0: SMSC911x/921x identified at 0xc8884000, IRQ: 336 | ||
[ 5.689666] IP-Config: Complete: | [ 5.689666] IP-Config: Complete: | ||
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[ 7.787384] VFS: Unable to mount root fs via NFS, trying floppy. | [ 7.787384] VFS: Unable to mount root fs via NFS, trying floppy. | ||
[ 7.794891] VFS: Cannot open root device "nfs" or unknown-block(2,0) | [ 7.794891] VFS: Cannot open root device "nfs" or unknown-block(2,0) | ||
− | </ | + | </source> |
Revision as of 16:49, 2 May 2012
Below are the kernel arguments used for mounting an NFS root filesystem
example:
root=/dev/nfs ip=10.99.99.2:10.99.99.1::255.255.255.252::usb0:off nfsroot=/nfsroot
The parameters for the ip
argument are as follows:
- Host IP Address (
10.99.99.2
) - NFS Server IP (
10.99.99.1
) - Gateway IP (none)
- Netmask (
255.255.255.252
or/30
) - Hostname (none)
- Interface (
usb0
) - Auto IP configure / DHCP after boot (
off
)
Debugging
NFS root filesystems always seem to be fiddly to get setup.
There is an option 'nfsrootdebug
' that prints out debug messages, for example:
[ 4.674285] net eth0: SMSC911x/921x identified at 0xc8884000, IRQ: 336 [ 5.689666] IP-Config: Complete: [ 5.692871] device=eth0, addr=10.150.129.116, mask=255.255.255.240, gw=255.255.255.255, [ 5.701721] host=10.150.129.116, domain=, nis-domain=(none), [ 5.708160] bootserver=10.150.129.117, rootserver=10.150.129.117, rootpath= [ 5.718017] Root-NFS: nfsroot=/home/agrande/proj/dvsdk/v4_03/targetfs [ 5.725036] NFS: nfs mount opts='nolock,addr=10.150.129.117' [ 5.731018] NFS: parsing nfs mount option 'nolock' [ 5.736267] NFS: parsing nfs mount option 'addr=10.150.129.117' [ 5.742706] NFS: MNTPATH: '/home/agrande/proj/dvsdk/v4_03/targetfs' [ 5.749328] NFS: sending MNT request for 10.150.129.117:/home/agrande/proj/dvsdk/v4_03/targetfs [ 7.775848] NFS: MNT server returned result -13 [ 7.780883] NFS: unable to mount server 10.150.129.117, error -13 [ 7.787384] VFS: Unable to mount root fs via NFS, trying floppy. [ 7.794891] VFS: Cannot open root device "nfs" or unknown-block(2,0)