After resized my instance from 512 plan to 1024 plan, I had on issue on the boot. I used lish connection to connect to my instance and I had a error message on the boot log :

nfs-common initialization : failed

So I use the root account and tried to relaunch the service with '/etc/init.d/nfs-common start' -> failed.
After some researches on google, I found this : http://lists.debian.org/debian-kernel/2 ... 00398.html
So I did it by removing nfs-commonn and portmap then I tried to reinstall nfs-common. But I got another issue, apt couldn't connect to the repositories.
I thought the problem come from network service, so I tried to start it manually by '/etc/init.d/network start' and I got a message in which it told me that there is twice eth0 configuration in my /etc/network/interfaces.
After looking in it, I found that there was another eth0 declaration :

auto eth0:0
iface eth0:0 inet static
address 
netmask 255.255.128.0

But I never wrote that ! It appears that something add it (I guess Linode script during the resize) without warmed me.
So I commented this part and tried again restart service. It worked, then I could reinstall nfs-commonn with apt-get. Finally, it works.

So I fixed my problem and I create this post for people in the same situation.