Creating a chroot jail is a great way to separate certain activities on a dedicated server from the rest of the server at large. Purposes for this can range from creating virtual private server containers to simply needing an isolated test environment. One common problem you may experience after create a chroot jail is that the chrooted user does not have network access.
In these situations, you will typically find that no usable network interface is present when you run the “ifconfig” command. Any attempts at adding one will fail, and the system will behave as though you do not have a network card installed. Even if you have setup all of the necessary filesystems: /proc, /dev,/dev/pts, and /sys, you may still not be able to connect to the network or the Internet.
Fortunately, the solution to this problem is quick and easy. In order for the chroot environment to connect to the Internet, you need to copy the DNS resolution information from your standard Linux installation to the new chrooted installation that you have created. Simply copy the resolv.conf file from one installation to the other. The following is an example:
# cp /etc/resolv.conf /var/chroot/etc/resolv.conf
In the example, /var/chroot is the location of the chroot system that the user has created. Adjust it accordingly to fit your system. After you have successfully copied the file, you should now be able to chroot into the new file system and access the Internet.