Nfs root
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| − | [[ | + | [[Ubuntu_server_12.04/nfs|Setting up an NFS server]] |
==NFS Server Configuration== | ==NFS Server Configuration== | ||
You must export the filesystem with the following parameters: | You must export the filesystem with the following parameters: | ||
<source lang="text"> | <source lang="text"> | ||
| − | / | + | /nfsroot *(rw,fsid=0,no_root_squash,no_subtree_check) |
| + | </source> | ||
| + | |||
| + | ==U-Boot== | ||
| + | <source lang="text"> | ||
| + | setenv ipaddr 10.99.99.2 | ||
| + | setenv serverip 10.99.99.1 | ||
| + | setenv bootfile uImage | ||
| + | tftpboot | ||
</source> | </source> | ||
| Line 12: | Line 20: | ||
example: | example: | ||
<code> | <code> | ||
| − | root=/dev/nfs ip=10.99.99.2:10.99.99.1::255.255.255. | + | root=/dev/nfs ip=10.99.99.2:10.99.99.1::255.255.255.0::usb0:off nfsroot=/nfsroot |
</code> | </code> | ||
| Line 19: | Line 27: | ||
# 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>) | ||
| Line 33: | Line 41: | ||
[ 5.701721] host=10.150.129.116, domain=, nis-domain=(none), | [ 5.701721] host=10.150.129.116, domain=, nis-domain=(none), | ||
[ 5.708160] bootserver=10.150.129.117, rootserver=10.150.129.117, rootpath= | [ 5.708160] bootserver=10.150.129.117, rootserver=10.150.129.117, rootpath= | ||
| − | [ 5.718017] Root-NFS: nfsroot=/ | + | [ 5.718017] Root-NFS: nfsroot=/nfsroot |
[ 5.725036] NFS: nfs mount opts='nolock,addr=10.150.129.117' | [ 5.725036] NFS: nfs mount opts='nolock,addr=10.150.129.117' | ||
[ 5.731018] NFS: parsing nfs mount option 'nolock' | [ 5.731018] NFS: parsing nfs mount option 'nolock' | ||
[ 5.736267] NFS: parsing nfs mount option 'addr=10.150.129.117' | [ 5.736267] NFS: parsing nfs mount option 'addr=10.150.129.117' | ||
| − | [ 5.742706] NFS: MNTPATH: '/ | + | [ 5.742706] NFS: MNTPATH: '/nfsroot' |
| − | [ 5.749328] NFS: sending MNT request for 10.150.129.117:/ | + | [ 5.749328] NFS: sending MNT request for 10.150.129.117:/nfsroot |
[ 7.775848] NFS: MNT server returned result -13 | [ 7.775848] NFS: MNT server returned result -13 | ||
[ 7.780883] NFS: unable to mount server 10.150.129.117, error -13 | [ 7.780883] NFS: unable to mount server 10.150.129.117, error -13 | ||
| Line 44: | Line 52: | ||
[ 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> | </source> | ||
| + | |||
| + | |||
| + | ==Error -13 - tips== | ||
| + | * Moving the NFS file system on the server | ||
| + | * Use the <code>nolock</code> option as a kernel argument | ||
Latest revision as of 17:22, 8 March 2013
Contents |
[edit] NFS Server Configuration
You must export the filesystem with the following parameters:
/nfsroot *(rw,fsid=0,no_root_squash,no_subtree_check)
[edit] U-Boot
setenv ipaddr 10.99.99.2 setenv serverip 10.99.99.1 setenv bootfile uImage tftpboot
[edit] 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)
[edit] 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)
[edit] Error -13 - tips
- Moving the NFS file system on the server
- Use the
nolockoption as a kernel argument
