Nfs root
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# NFS Server IP (<code>10.99.99.1</code>) | # NFS Server IP (<code>10.99.99.1</code>) | ||
# Gateway IP (''none'') | # Gateway IP (''none'') | ||
| − | # Netmask (<code>255.255.255. | + | # Netmask (<code>255.255.255.0</code> or <code>/24</code>) |
# Hostname (''none'') | # Hostname (''none'') | ||
# Interface (<code>usb0</code>) | # Interface (<code>usb0</code>) | ||
Revision as of 19:30, 12 November 2012
NFS Server Configuration
You must export the filesystem with the following parameters:
/nfsroot *(rw,fsid=0,no_root_squash,no_subtree_check)
Kernel Configuration
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::255.255.255.0::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 (
255.255.255.0or/24) - 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=/nfsroot [ 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: '/nfsroot' [ 5.749328] NFS: sending MNT request for 10.150.129.117:/nfsroot [ 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)
