Shulou(Shulou.com)06/01 Report--

Editor to share with you how to configure the Linux system chroot environment, I hope you will learn something after reading this article, let's discuss it together!

Chroot, or change root directory (change the root directory). In linux systems, the default directory structure of the system starts with /, that is, the root. After using chroot, the directory structure of the system will take the specified location as the / location.

Using the chroot environment for Debootstrap and Schroot requires the installation of debootstrap and schroot, both of which are in the mirror source of Ubuntu. Where schroot is used to create a chroot environment.

Debootstrap allows you to install any Debian (or Debian-based) system from a mirror source that contains the most basic commands.

The Schroot command allows the user to use the same mechanism to create the chroot environment, but does some permission checks when accessing the chroot environment, and allows the user to make additional automatic settings, such as mounting some file systems.

On Ubuntu 14.04 LTS, we can do this in two steps:

1. The first step in installing the package is to install debootstrap and schroot on the Ubuntu 14.04 LTS host system:

$sudo apt-get install debootstrap $sudo apt-get install schroot2. Now that we have the tools in hand to configure Schroot, we need to specify a directory as our chroot environment. Create a directory here first:

Sudo mkdir / linoxide edits the configuration file for schroot:

Sudo nano / etc/schroot/schroot.conf again, we are on the Ubuntu 14.04 LTS system. If we want to test whether a package can run on Ubuntu 13.10 (code name "Saucy Salamander"), we can add the following to the configuration file:

[saucy] description=Ubuntu Saucylocation=/linoxidepriority=3users=arunroot-groups=root

Adjust the above configuration information according to your system requirements.

3. Installing a 32-bit Ubuntu system using debootstrap the Debootstrap command downloads and installs a minimum system in your chroot environment. As long as you can access the mirror source, you can install any version of the Debian-based system.

Now that we have created the / linoxide directory to place the chroot environment, we can run debootstrap in this directory:

Cd / linoxide sudo debootstrap-- variant=buildd-- arch amd64 saucy / linoxide/ http://archive.ubuntu.com/ubuntu/ sudo chroot / linoxide/ debootstrap/debootstrap-- second-stage you can change the parameter of-arch to i386 or other architecture, as long as there is a mirror source for this architecture. You can also change the image source http://archive.ubuntu.com/ubuntu/ to the one closest to you. For more information, please refer to the official Ubuntu image home page.

Note: if you are creating a 32-bit system on a 64-bit system, you need to add the-foreign option to line 3 above, like the following command:

Sudo debootstrap-- variant=buildd-- foreign-- arch i386 saucy / linoxide/ http://archive.ubuntu.com/ubuntu/ download will take a while, depending on your network bandwidth performance. The smallest system is about 500m.

4. After completing the installation of the system in the chroot environment, we need to do some finishing work to ensure that the system is running properly. First, make sure that the host fstab program is aware of the existence of the chroot environment:

Sudo nano / etc/fstab adds the following configuration at the end of the file:

Proc / linoxide/proc proc defaults 0 0 sysfs / linoxide/sys sysfs defaults 0 0 save and close the file.

Mount some file systems to the chroot environment:

$sudo mount proc / linoxide/proc-t proc $sudo mount sysfs / linoxide/sys-t sysfs copies the / etc/hosts file to the chroot environment so that the chroot environment can use the network:

$sudo cp / etc/hosts / linoxide/etc/hosts finally uses the schroot-l command to list all chroot environments on the system:

$schroot-l enter the chroot environment using the following command:

$sudo chroot / linoxide/ / bin/bash test installed version:

# lsb_release-a # uname-an in order to use the graphical interface in the chroot environment, you need to set the DISPLAY environment variable:

$DISPLAY=:0.0. / apps so far, I have successfully installed Ubuntu 13.10 on Ubuntu 14.04 LTS.

Exit the chroot environment:

# exit clean up and unmount the file system:

After reading this article, $sudo umount / test/proc$ sudo umount / test/sys, I believe you have a certain understanding of "how to configure the chroot environment for Linux systems". If you want to know more about it, please follow the industry information channel. Thank you for reading!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.