Migrating Red Hat Server to CentOS

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This one is to convert a Red Hat 7.X machine to CentOS 7.X machine.

https://www.openlogic.com/blog/step-step-migration-rhel-74-centos-74

This one covers several different convert/upgrade options, but I was looking at the RH 5.X to CentOS 5.X and 6.X to 6.X conversion parts. 7.X is very similar to 6.X.

https://wiki.centos.org/HowTos/MigrationGuide

Now, Red Hat and CentOS 5.X is only in extended support right now, so you have to find the RPS in the vault, so below are the commands I used to convert. 

# cp /etc/redhat-release /etc/redhat-release-saved
# rpm -e --nodeps redhat-release-notes redhat-release yum-rhn-plugin redhat-logos
# rpm -ivh \
http://vault.centos.org/5.7/os/i386/CentOS/centos-release-5-7.el5.centos.i386.rpm \
http://vault.centos.org/5.7/os/i386/CentOS/centos-release-notes-5.7-0.i386.rpm \
http://vault.centos.org/5.7/os/i386/CentOS/redhat-logos-4.9.99-11.el5.centos.noarch.rpm
# yum update

The last command won't work, since it will be pointing to the main repo mirror. You will want to change the /etc/yum.repos.d/CentOS-Base.repo file to look like below. I used 5.11, as that is the last version, but you could pick another one, if desired. 

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS- - Base
baseurl=http://vault.centos.org/5.11/os/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#released updates 
[updates]
name=CentOS- - Updates
baseurl=http://vault.centos.org/5.11/updates/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS- - Extras
baseurl=http://vault.centos.org/5.11/extras/x86_64/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS- - Plus
baseurl=http://vault.centos.org/5.11/centosplus/x86_64/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS- - Contrib
baseurl=http://vault.centos.org/5.11/contrib/x86_64/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
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