Link

http://www.udel.edu/topics/os/unix/general/groupsharing.html

Now this directory is correct for group sharing, but new files will not be correct. New files will be owned but the group of the shell and will not have the correct permissions. If you start the shell in the correct group and set the umask command you can make new files automatically owned and permitted properly. However if your group members put file here with ftp or scp, these shell commands will not help.
Instead we will use two commands to solve this problem. The command:

chmod g+s groupshare

will set the "set groupid" bit for the groupshare directory. This means all new files will be owned by the group of the parent directory instead of the current shell. In this case, group which is 0217 will be assigned to all new files or directories. Also this "set groupid" bit will be set on all new directories, so the group will be properly set for all files in the hierarchy.
The command

setfacl -m d:u::rwx,d:g::rwx,d:m:rwx,d:o:r-x groupshare

will set the default:user, default:group, default:mask and default:other. These defaults will be used to set the permission modes for any new file. You must set all these defaults, so this means you have a long command. That is why we used the abbreviations d:u,d:g, d:m and d:o.

Link

http://wiki.centos.org/HowTos/MigrationGuide/ServerCD_4.4_to_5

This is not a supported upgrade path !

The Server CD series mentioned here does not exist in all CentOS releases, nor in each point level respin. The CentOS team strives to permit minimal installs with just CD 1 of a given series, but this is not always possible. Please check the Release Notes for a given Major and Point release for further details.

You have to force an install of python-sqlite from the CentOS 5 repositories after the upgrade, as the version number of python-sqlite didn't change between 4 and 5.

rpm -Uvh --replacepkgs python-sqlite-1.1.7-1.2.1.i386.rpm

Otherwhise you'll get the error

Could not find any working storages

There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named sqlite

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.4.3 (#1, Mar  5 2011, 21:25:56)                    
[GCC 4.1.2 20080704 (Red Hat 4.1.2-50)]              

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq

Always have a current backup of you data !

This is a "general" guideline for a CentOS 4.4 Server CD install upgrade via yum.

YMMV with additionally installed RPMS and RPMS from third party Repositories.

I did a fresh install of the x86_64 Server 4.4 CD (everything) for this migration test.

Now that I have a CentOS 4.4 install, I will begin the migration to CentOS 5 via yum.

Start the upgrade process

mkdir /tmp/Upgrades
cd /tmp

Check for centos-yumconf

rpm -qi centos-yumconf

* If centos-yumconf exist, remove it.

* NOTE this seems to be only installed if you installed from the x86_64 version of the ServerCD 4.4 ISO.

rpm -e centos-yumconf

Installing needed RPMS manually

I used wget to acquire the RPMS.

Install centos-release-5-0.0.el5.centos.2.x86_64.rpm centos-release-notes-5.0.0-2.x86_64.rpm

rpm -Uvh centos-release-5-0.0.el5.centos.2.x86_64.rpm centos-release-notes-5.0.0-2.x86_64.rpm

# Make sure you disable all other repos and only have CentOS Base and Updates repositories enabled.

Install the CentOS 5 GPG Key

# Get the GPG key from a mirror or CentOS 5 media.

rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5

cd /tmp/Upgrades

Download the following RPMS

# This gets the new yum/rpm working.

rpm-libs-4.4.2-37.el5.x86_64.rpm
rpm-4.4.2-37.el5.x86_64.rpm
yum-3.0.5-1.el5.centos.2.noarch.rpm
rpm-python-4.4.2-37.el5.x86_64.rpm
popt-1.10.2-37.el5.x86_64.rpm
glibc-2.5-12.x86_64.rpm
glibc-common-2.5-12.x86_64.rpm
beecrypt-4.1.2-10.1.1.x86_64.rpm
glibc-headers-2.5-12.x86_64.rpm
glibc-devel-2.5-12.x86_64.rpm
binutils-2.17.50.0.6-2.el5.x86_64.rpm
elfutils-libelf-0.125-3.el5.x86_64.rpm
elfutils-0.125-3.el5.x86_64.rpm
elfutils-libs-0.125-3.el5.x86_64.rpm
beecrypt-python-4.1.2-10.1.1.x86_64.rpm
python-2.4.3-19.el5.x86_64.rpm
python-devel-2.4.3-19.el5.x86_64.rpm
python-elementtree-1.2.6-5.x86_64.rpm
python-sqlite-1.1.7-1.2.1.x86_64.rpm
python-urlgrabber-3.1.0-2.noarch.rpm
neon-0.25.5-5.1.x86_64.rpm
libxml2-2.6.26-2.1.2.x86_64.rpm
libxml2-python-2.6.26-2.1.2.x86_64.rpm
db4-4.3.29-9.fc6.x86_64.rpm
libselinux-1.33.4-2.el5.x86_64.rpm
libsepol-1.15.2-1.el5.x86_64.rpm
mcstrans-0.1.10-1.el5.x86_64.rpm
m2crypto-0.16-6.el5.1.x86_64.rpm
krb5-libs-1.5-17.x86_64.rpm
openssl-0.9.8b-8.3.el5.x86_64.rpm
readline-5.1-1.1.x86_64.rpm

# Install above RPMS

rpm -Uvh *.rpm --nodeps

# Clean and rebuild rpmdb for CentoS 5

rm -f /var/lib/rpm/__*
rpm --rebuilddb

# Clean yum files

yum clean all

# Remove deps/outdated packages

Note: You can run yum upgrade to help find deps that you need to remove.

rpm -e VFlib2 caching-nameserver autofs kudzu pcmcia-cs xorg-x11 newt-perl hal crypto-utils --nodeps

Install new CentOS 5 kernel

# If you are getting the new kernel via wget you need to do the following first.

yum upgrade wget

rpm -ivh kernel-2.6.18-8.el5.x86_64.rpm --nodeps

Remove old CentOS 4 kernel(s)

rpm -qa | grep kernel

remove 2.6.9 bits

rpm -e kernel-2.6.9-42.EL kernel-devel-2.6.9-42.EL kernel-doc-2.6.9-42.EL

Upgrade the system to CentOS 5

yum upgrade

# Install removed packages that were not reinstalled

yum install caching-nameserver autofs

cd /tmp

# Generate list of RPMS on the system after upgrade to see what old RPMS are left

rpm -qa >Upgrade_RPM_List

# Reboot system

reboot

# Login and you should be on CentOS 5

uname -a

Linux localhost.localdomain 2.6.18-8.1.1.el5 #1 SMP Mon Apr 9 09:43:24 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

At this point you will need to start upgrading any extra/third party RPMS.

Things to remember

Wednesday, July 13, 2011

Give other users right on directory. Files created by root are editable by group users.

Tuesday, July 12, 2011

Migration Centos 4.4 to 5

Link

Always have a current backup of you data !

Start the upgrade process