chroot environment on CentOS 6.3

Steps to install a chroot jail on CentOS 6.3

cat /etc/centos-release
...CentOS release 6.3 (Final)

cd /home/
mkdir chroot
mkdir -p chroot/var/lib/rpm

rpm --rebuilddb --root=/home/chroot/

wget http://mirror.centos.org/centos-6/6.3/os/x86_64/Packages/centos-release-6-3.el6.centos.9.x86_64.rpm

rpm -i --root=/home/chroot/ --nodeps centos-release-6-3.el6.centos.9.x86_64.rpm
...warning: centos-release-6-3.el6.centos.9.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY

yum --installroot=/home/chroot install -y rpm-build yum

cp -vi /home/chroot/etc/skel/.??* /home/chroot/root/
    `/home/chroot/etc/skel/.bash_logout' -> `/home/chroot/root/.bash_logout'
    `/home/chroot/etc/skel/.bash_profile' -> `/home/chroot/root/.bash_profile'
    `/home/chroot/etc/skel/.bashrc' -> `/home/chroot/root/.bashrc'

mount --bind /proc /home/chroot/proc
mount --bind /dev /home/chroot/dev
cp /etc/resolv.conf /home/chroot/etc/

Now you can use YUM to install additional software from inside the chroot jail. Or you can always exit the jail and install from outside using the yum –installroot switch.

chroot /home/chroot/ /bin/bash -l

You should be inside the chroot now.

# add following line to /root/.bashrc

PS1=CHROOT.$PS1

If you plan to use the screen command, or any application that uses /dev/pts, run the following script first:

CHROOT.[root@host ~]# ./mount_pts.sh

#!/bin/bash
# makes it works the screen command inside the chrooted environment
umount /dev/pts
mount -t devpts -o rw,gid=5,mode=620 none /dev/pts

Installing packages inside the chroot:

yum provides "*/ping"
yum provides "*/bin/telnet"

yum install telnet

yum install httpd

yum install php php-cli php-pdo php-mysql php-snmp php-soap php-odbc php-imap php-gd

Checking PHP version

[root@host ~] php --version
No log handling enabled - turning on stderr logging
Created directory: /var/lib/net-snmp/mib_indexes
PHP 5.3.3 (cli) (built: Jul 3 2012 16:53:21)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

Starting Apache ….

CHROOT.[root@host] service httpd status
httpd is stopped
CHROOT.[root@host] service httpd start
Starting httpd: [ OK ]

Have Fun.

chroot environment on CentOS 6.3

Steps to install a chroot jail on CentOS 6.3

LOGIN INTO THE CHROOT ENVIRONMENT