11-20-2012
Yes mainly they use same kernel and packages.
As fpmurphy said pre-production environment should be the same.
I think you can use Centos only if you know what you doing, like if you know your services enough - what libs, lib versions they use and how use.
But also I don`t see why you need that depravity - use RHEL also on test environment?!
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LEARN ABOUT CENTOS
yumdownloader
yumdownloader(1) yumdownloader(1)
NAME
yumdownloader - download RPM packages from Yum repositories
SYNOPSIS
yumdownloader [options] package1 [package2...]
DESCRIPTION
yumdownloader is a program for downloading RPMs from Yum repositories.
GENERAL OPTIONS
-h, --help
Help; display a help message and then quit.
--destdir DIR
Specify a destination directory for the download. Defaults to the current directory.
--urls Instead of downloading RPMs, list the URLs that would be downloaded.
--resolve
When downloading RPMs, resolve dependencies and also download the required packages.
--source
Instead of downloading the binary RPMs, download the source RPMs.
--archlist=ARCH1[,ARCH2...]
Limit the query to packages of given architecture(s). Valid values are all architectures known to rpm/yum such as 'i386' and 'src'
for source RPMS. Note that repoquery will now change yum's "arch" to the first value in the archlist. So "--archlist=i386,i686" will
change yum's canonical arch to i386, but allow packages of i386 and i686.
ADDITIONAL OPTIONS
Yumdownloader inherits all other options from yum. See the yum(8) man page for more information
EXAMPLES
Download the kernel RPM to /var/tmp:
yumdownloader --destdir /var/tmp kernel
List the URL for the kernel and kernel-smp RPMs:
yumdownloader --urls kernel kernel-smp
FILES
As yumdownloader uses YUM libraries for retrieving all the information, it relies on YUM configuration for its default values like which
repositories to use. Consult YUM documentation for details:
/etc/yum.conf
/etc/yum/repos.d/
/var/cache/yum/
SEE ALSO
yum.conf (5)
http://yum.baseurl.org/
AUTHORS
See the Authors file included with this program.
BUGS
There are of course no bugs, but should you find any, you should first consult the FAQ section on http://yum.baseurl.org/wiki/Faq and if
unsuccessful in finding a resolution contact the mailing list: yum-devel@lists.baseurl.org. To file a bug use http://bugzilla.redhat.com
for Fedora/RHEL/Centos related bugs and http://yum.baseurl.org/report for all other bugs.
Gijs Hollestelle 28 November 2005 yumdownloader(1)