14 May, 2010 Linux Sugan
Debian Linux command to get into network interface card
#vi /etc/network/interfaces
How to assign multiple IP addresses in debian linux:
You can assign multiple IP addresses to the same network interface by using interface alias. This is useful if you need to have more than one server visible on the internet. Note that for multiple Apache servers you can use virtual hosts to add as many servers as you like with one single IP address.Apache simply utilises the domain name supplied by the client in the http host header.
You must turn off dhcp because you must use static assignment if you are configuring multiple IPs, so basically this file is:
# The loopback network interfaceauto loiface lo inet loopback
# The primary network interfaceauto eth0iface eth0 inet staticaddress 192.168.1.90gateway 192.168.1.1netmask 255.255.255.0network 192.168.1.0broadcast 192.168.1.255
Assuming that you interface is eth0, you can assign three IP addresses editing /etc/network/interfaces similar to this:
# the loopback interfaceauto loiface lo inet loopback
#auto eth0iface eth0 inet staticaddress 192.168.1.42netmask 255.255.255.0broadcast 192.168.1.255gateway 192.168.1.1
auto eth0:0iface eth0:0 inet staticaddress 192.168.1.41netmask 255.255.255.0broadcast 192.168.1.255
auto eth0:1iface eth0:1 inet staticaddress 192.168.1.43netmask 255.255.255.0broadcast 192.168.1.255
auto eth0:2iface eth0:2 inet staticaddress 192.168.1.44netmask 255.255.255.0broadcast 192.168.1.255
Note that gateway is only assigned to eth0. If you include dns-nameservers, it should also only be specified for eth0.
If you make changes to this file you can cause them to take effect by running:/etc/init.d/networking restart
# /etc/init.d/networking restartReconfiguring network interfaces…if-up.d/mountnfs[eth0]: waiting for interface eth0:0 before doing NFS mounts (warning).if-up.d/mountnfs[eth0]: waiting for interface eth0:1 before doing NFS mounts (warning).if-up.d/mountnfs[eth0]: waiting for interface eth0:2 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:0]: waiting for interface eth0:1 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:0]: waiting for interface eth0:2 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:1]: waiting for interface eth0:2 before doing NFS mounts (warning).done.
How to fix if-up.d/mountnfs[eth0:1]: waiting for interface eth0:2 before doing NFS mounts (warning). ?
Reconfiguring network interfaces…if-up.d/mountnfs[eth0]: waiting for interface eth0:0 before doing NFS mounts (warning).if-up.d/mountnfs[eth0]: waiting for interface eth0:1 before doing NFS mounts (warning).if-up.d/mountnfs[eth0]: waiting for interface eth0:2 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:0]: waiting for interface eth0:1 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:0]: waiting for interface eth0:2 before doing NFS mounts (warning).if-up.d/mountnfs[eth0:1]: waiting for interface eth0:2 before doing NFS mounts (warning).done.
Solution:
It means that it is making sure that all ‘net interfaces are up before trying to mount a network based filesystem.
# chmod -x /etc/network/if-up.d/mountnfs
合理的解释：
I wouldn't worry too much. It appears to be a warning that can be ignored in the presence of multiple interfaces. What is happening is that the primary eth0 interface is brought up (via ifup) due to its entry in /etc/network/interfaces. In response to that, scripts in /etc/network/if-up.d will run automatically. And one of those scripts is mountnfs to automatically mount any filesystems in /etc/fstab that are marked as nfs. You'll find the code that generates the warning in /etc/network/if-up.d/mountnfs. I'm guessing at why the code was written this way, but since the script can't tell with certainty which (if you have multiple) of your network interfaces may be needed for the NFS mount to succeed, it checks all the "auto" interfaces in /etc/network/interfaces and if any aren't configured yet, it exits with the warning you saw. In your case, you have a second, eth0:0, alias interface, that holds your secondary address which isn't up yet - thus the warning. But since the same script will then re-run on each subsequent interface coming up, when it gets to the final interface it proceeds to mount any network filesystems. From the script on Debian (assuming Debian 5 - I don't have a Debian 4 image to check), it appears that the "am I the last interface to come up" check is done even before checking fstab so you can get this warning even if you don't have any nfs filesystems configured. If the message annoys you, and you don't have any nfs mounts, you can always get rid of the mountnfs script in /etc/network/if-up.d, or chmod -x the script, which will cause it to be skipped.
