Thursday, February 14, 2013

How to set up a chroot environment for testing

Recently I have suffered a total system destruction in one of my computers. It happened while I was testing a software that I am developing, due to a simple bug. It helped me realize my lack of caution while testing unstable things, and I learned that it is always better to do the testing inside a chroot environment. Chroot’s provide isolation from the rest of the operating system, so that in case of severe errors damage can be mitigated.

Here are the steps that I took for installing a chroot environment for testing.
  • Install the packages debootstrap and dchroot:
    sudo apt-get install debootstrap dchroot
  • Add these line to /etc/schroot/schroot.conf:
    description=Ubuntu Precise LTS
  • Bootstrap the chroot with a minimal Ubuntu installation:
    debootstrap --variant=minbase --arch=amd64 precise \
    cp /etc/resolv.conf /var/chroot/btranslator/etc/resolv.conf
    cp /etc/apt/sources.list /var/chroot/btranslator/etc/apt/
    mount -o bind /proc /var/chroot/btranslator/proc
    chroot /var/chroot/btranslator/
    apt-get install ubuntu-minimal
    apt-get update
    apt-get upgrade
    apt-get install language-pack-en-base
    apt-get install vim aptitude
  • Install LAMP:
    apt-get install aptitude tasksel
    tasksel install lamp-server
  • Make a startup script /etc/init.d/chroot-btranslator with a content like this:
    case "$1" in
        service apache2 stop
        service mysql stop
        mount -o bind /proc $CHROOT/proc
        mount -o bind /dev $CHROOT/dev
        mount -o bind /sys $CHROOT/sys
        mount -o bind /dev/pts $CHROOT/dev/pts
        chroot $CHROOT/  service mysql start
        chroot $CHROOT/  service apache2 start
        chroot $CHROOT/  service apache2 stop
        chroot $CHROOT/  service mysql stop
        umount $CHROOT/dev/pts
        umount $CHROOT/sys
        umount $CHROOT/dev
        umount $CHROOT/proc
        service mysql start
        service apache2 start
  • Make it executable and start it at boot:
    chmod +x /etc/init.d/chroot-btranslator
    update-rc.d chroot-btranslator defaults
    service chroot-btranslator start
Date: 2013-02-14 21:31:49 CET
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