How to resolve hostnames in chroot?

I try to repair an broken Ubunu 14.04 with chroot. What I did, is to boot Ubuntu from USB mounted the original system that has to be repaired and changed to this system with chroot:

sudo mount /dev/sdXY /mnt
sudo mount -o bind /dev /mnt/dev
sudo mount -o bind /sys /mnt/sys
sudo mount -t proc /proc /mnt/proc
sudo cp /proc/mounts /mnt/etc/mtab
sudo chroot /mnt /bin/bash 

That worked fine, but in chroot environment I don't have access to the internet, so apt isn't able to resolve hostnames. What am I supposed to do?

ping 

does not work either.

1 Answer

On newer Ubuntu systems, name resolution is handled by the resolvconf service, and /etc/resolv.conf is a symbolic link to /run/resolvconf/resolv.conf. You can either add a bind mount to the /run filesystem along with your other bind mounts before executing the chroot command

sudo mount -o bind /run /mnt/run

so that the chroot system picks up the host system's DNS settings or, once you're in the chrooted system, temporarily create a static /etc/resolv.conf with nameserver(s) of your choice e.g.

echo 'nameserver 8.8.4.4' | sudo tee -a /etc/resolv.conf