Red Hat Enterprise Linux 6 to 7

Red Hat Enterprise Linux 6 to 7?
Migrating existing Red Hat Enterprise Linux installations to new major versions

Migration vs. Upgrade
•migration: Moving a set of running services from one installed system to another, including all configuration aspects and data.
•upgrade: Upgrading the installed software to newer revisions. This process may or may not include migration.

•A new feature in RHEL 7 is functionality that marketing is calling in-place upgrades.
•We are offering a supported path to upgrade a RHEL 6 system to RHEL 7 without having to backup, format, reinstall, and restore.
•(NOTE: Must be upgrading from RHEL 6.latest on x86_64…for now.)
•The in-place aspect is meant to emphasize the fact that you do not have to move your data and configuration files off the system.
•In-place DOES NOT mean you avoid a reboot.

Actual Strategies We Have Seen Used
•Wait until you replace hardware to upgrade.
•Buy new server, install latest version, migrate all data from old system.
•yum distupgrade and hope for the best.
•One site actually used constantly regenerating yum repos.
•Do nothing.
•In some cases, start using the RHEL Extended Update Support[1]
program for critical fixes

What is EUS?
•Extended Update Support for Red Hat Enterprise Linux
•Allows you to standardize on a specific minor release for anextended period.
•Available for every RHEL 6 minor release.
•Includes critical security fixes and urgent bug fixes for two years.
•Part of your Premium RHEL subscription, or Sales would be happy to discuss if you’d like to add onto a different subscription level.

Example Pain Points
•Desired application requires a newer base level software component (e.g., MySQL, Apache, or PHP) and your chosen model of no-upgrades is not sustainable.
•Sysadmins do not have infinite time.
•New hardware enablement does not last forever eventually, RHEL releases enter Production Phase 3, which is maintenance only.[2]
•Not upgrading leaves you vulnerable to some software security risks.

Goals

•Treat migrating and upgrading as distinct operations.
•Provide tools that are flexible enough to integrate in to site specific workflows.
•Allow for vendors and sites to extend the tools as necessary.
•Encourage contributions back to the tools for future RHEL releases.

Current RHEL Tools
•anaconda: Performs interactive and automated installations.
•ksverdiff: Shows kickstart syntax differences between versions
of RHEL and Fedora (part of the pykickstart package).
•ksvalidator: Validates a kickstart file against a specified kickstart
revision (part of the pykickstart package).
•lvcreate to create LVM snapshots.
•tar to create backups.
•mt to rewind tape drives

New RHEL Tools
•preupgrade-assistant
•Assists as you perform the the migration step.
•redhat-upgrade-tool
•Performs the upgrade step.

preupgrade-assistant
•Evaluates a RHEL 6 system for suitability to upgrade to RHEL 7.
•Output is report-like, similar to a tool like setroubleshoot.
•Problems are categorized and explained.
•Solutions to remedy are offered in the explanation text -or- in some cases
the solutions can be automatically applied.
•Can be run multiple times to determine if a system “passes”.
•Also produces script output which can be integrated in to other
tools as your site requires.
•Can be extended with 3rd party plug-ins.

Support
•Tested and supported use case at this point is:
• Upgrading from RHEL 6.5 to RHEL 7.0
• Must be using the Server variant
• Must be x86_64
•Either base or minimal package selection

Step 1 – Backup
•You do backups, right?
•Take a snapshot of the system using lvcreate. You can boot from install media later and use rescue mode to restore this snapshot should your upgrade fail.
•PROTIP: Make an easily accessible copy of configuration files for reference

Step 2 – Download preupgrade-assistant
•Install these prerequisite packages:
•yum install openscap pcredevel mod_wsgi
•These are the packages for preupgrade-assistant for the RHEL
7.0 Beta program:
•preupgradeassistant1.0.26.el6.x86_64.rpm
•preupgradeassistantcontents0.4.41.el6.noarch.rpm
•Packages available at the RHEL 7.0 GA release will be different.
•Be sure to download both packages and install with:
•yum localinstall preupgradeassistant*.rpm

Step 3 – Run preupgrade-assistant
•Download preupgrade-assistant on your RHEL 6 system.
•Beta program: https://access.redhat.com/site/solutions/637583
•Install preupgrade-assistant using yum localinstall.
•Run preupgradeassistant and evaluate the output. Iterate this process until you are satisfied with the results of preupgrade-assistant.
•PROTIP: Take another snapshot of the system after completing the preupgrade-assistant step

Step 4 – Download redhat-upgrade-tool
•Install these prerequisite packages:
•preupgradeassistant and what it requires
•These are the packages for redhat-upgrade-tool for the RHEL 7.0
Beta program:
•redhatupgradetool0.7.51.el6_5.noarch.rpm
•Versions available at the RHEL 7.0 GA release will be different.
•Be sure to download both packages and install with:
•yum localinstall redhatupgradetool*.rpm

Step 5 – Run redhat-upgrade-tool
•Download redhat-upgrade-tool on your RHEL 6 system.
•Beta program: https://access.redhat.com/site/solutions/637583
•Install redhat-upgrade-tool using RPM.
•Run redhatupgradetool pointing at the RHEL-7.0 DVD
media you have mounted (or a network-accessible yum repo containing the RHEL-7.0 repo from the DVD).
•Follow the instructions to reboot the system and perform the upgrade.redhat-upg

redhat-upgrade-tool tips
•Do not try to upgrade a 32-bit x86 system to x86_64. This upgrade path is not supported.
•Minimize risk by removing unnecessary 32-bit packages from multiarch systems before upgrading.
•You may need to add additional repo specifications to redhat-upgrade-tool depending on what channels you used to

install software.
•–addrepo=REPOID=URL
•–addrepo=REPOID=@MIRRORLIST

entOS has not yet posted any official document on upgrading the CentOS 6, since there is no official documentation; we are not recommending this upgrade on production environment. If you like to give a try on development, you can just follow the simple steps.

Installing Redhat upgrade tool:

redhat-upgrade-tool is not available on standard repositories, you must setup the repository to install it.

# vi /etc/yum.repos.d/upgrade.repo

Place the following entries in it.

[upgrade]
name=upgrade
baseurl=http://dev.centos.org/centos/6/upg/x86_64/
enabled=1
gpgcheck=0

Install the following packages.

# yum -y install preupgrade-assistant-contents redhat-upgrade-tool preupgrade-assistant

PreUpgrade Assistant:

Run the following command to check the potential problem you might encounter with an upgrade from CentOS 6 to CentOS 7 before making a changes to the system.

# preupg

[root@oracle ~]# yum -y install preupgrade-assistant-contents redhat-upgrade-to ol preupgrade-assistant
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirror.nus.edu.sg
* extras: mirror.nus.edu.sg
* updates: mirror.nus.edu.sg
base | 3.7 kB 00:00
extras | 3.4 kB 00:00
ol6_UEK_latest | 1.2 kB 00:00
ol6_UEK_latest/primary | 15 MB 00:46
ol6_UEK_latest 337/337
ol6_latest | 1.4 kB 00:00
ol6_latest/primary | 40 MB 00:31
ol6_latest 25743/25743
updates | 3.4 kB 00:00
updates/primary_db | 4.2 MB 00:02
upgrade | 1.9 kB 00:00
upgrade/primary_db | 11 kB 00:00
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package preupgrade-assistant.x86_64 0:1.0.2-33.0.3.el6.centos will be installed
–> Processing Dependency: openscap(x86-64) >= 0.9.3-1 for package: preupgrade-assistant-1.0.2-33.0.3.el6.centos.x86_64
–> Processing Dependency: pkgconfig(libpcre) for package: preupgrade-assistant-1.0.2-33.0.3.el6.centos.x86_64
—> Package preupgrade-assistant-contents.noarch 0:0.5.13-1.0.5.el6.centos will be installed
—> Package redhat-upgrade-tool.noarch 1:0.7.22-3.el6.centos will be installed
–> Running transaction check
—> Package openscap.x86_64 0:1.0.8-1.0.1.el6_5 will be installed
—> Package pcre-devel.x86_64 0:7.8-6.el6 will be installed
–> Finished Dependency Resolution

Dependencies Resolved

===============================================================================================================================
Package Arch Version Repository Size
===============================================================================================================================
Installing:
preupgrade-assistant x86_64 1.0.2-33.0.3.el6.centos upgrade 439 k
preupgrade-assistant-contents noarch 0.5.13-1.0.5.el6.centos upgrade 590 k
redhat-upgrade-tool noarch 1:0.7.22-3.el6.centos upgrade 85 k
Installing for dependencies:
openscap x86_64 1.0.8-1.0.1.el6_5 ol6_latest 2.9 M
pcre-devel x86_64 7.8-6.el6 base 318 k

Transaction Summary
===============================================================================================================================
Install 5 Package(s)

Total download size: 4.3 M
Installed size: 49 M
Downloading Packages:
(1/5): openscap-1.0.8-1.0.1.el6_5.x86_64.rpm | 2.9 MB 00:06
(2/5): pcre-devel-7.8-6.el6.x86_64.rpm | 318 kB 00:00
(3/5): preupgrade-assistant-1.0.2-33.0.3.el6.centos.x86_64.rpm | 439 kB 00:01
(4/5): preupgrade-assistant-contents-0.5.13-1.0.5.el6.centos.noarch.rpm | 590 kB 00:01
(5/5): redhat-upgrade-tool-0.7.22-3.el6.centos.noarch.rpm | 85 kB 00:00
———————————————————————————————————————————————————————————————————————————————
Total 292 kB/s | 4.3 MB 00:14
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : pcre-devel-7.8-6.el6.x86_64 1/5
Installing : openscap-1.0.8-1.0.1.el6_5.x86_64 2/5
Installing : preupgrade-assistant-1.0.2-33.0.3.el6.centos.x86_64 3/5
Installing : 1:redhat-upgrade-tool-0.7.22-3.el6.centos.noarch 4/5
Installing : preupgrade-assistant-contents-0.5.13-1.0.5.el6.centos.noarch 5/5
Verifying : preupgrade-assistant-1.0.2-33.0.3.el6.centos.x86_64 1/5
Verifying : 1:redhat-upgrade-tool-0.7.22-3.el6.centos.noarch 2/5
Verifying : pcre-devel-7.8-6.el6.x86_64 3/5
Verifying : openscap-1.0.8-1.0.1.el6_5.x86_64 4/5
Verifying : preupgrade-assistant-contents-0.5.13-1.0.5.el6.centos.noarch 5/5

Installed:
preupgrade-assistant.x86_64 0:1.0.2-33.0.3.el6.centos preupgrade-assistant-contents.noarch 0:0.5.13-1.0.5.el6.centos redhat-upgrade-tool.noarch 1:0.7.22-3.el6.centos

Dependency Installed:
openscap.x86_64 0:1.0.8-1.0.1.el6_5 pcre-devel.x86_64 0:7.8-6.el6

Complete!

[root@oracle ~]# preupg
Preupg tool doesn’t do the actual upgrade.
Please ensure you have backed up your system and/or data in the event of a failed upgrade
that would require a full re-install of the system from installation media.
Do you want to continue? y/n
y
Gathering logs used by preupgrade assistant:
All installed packages : 01/11 …finished (time 00:00s)
All changed files : 02/11 …finished (time 03:19s)
Changed config files : 03/11 …finished (time 00:00s)
All users : 04/11 …finished (time 00:00s)
All groups : 05/11 …finished (time 00:00s)
Service statuses : 06/11 …finished (time 00:00s)
All installed files : 07/11 …finished (time 00:02s)
All local files : 08/11 …finished (time 00:04s)
All executable files : 09/11 …finished (time 00:00s)
RedHat signed packages : 10/11 …finished (time 00:00s)
CentOS signed packages : 11/11 …finished (time 00:00s)
Assessment of the system, running checks / SCE scripts:
001/095 …done (Configuration Files to Review)
002/095 …done (File Lists for Manual Migration)
003/095 …done (Bacula Backup Software)
004/095 …done (MySQL configuration)
005/095 …done (Migration of the MySQL data stack)
006/095 …done (General changes in default MySQL implementation)
007/095 …done (PostgreSQL upgrade content)
008/095 …done (GNOME Desktop Environment underwent several design modifications in CentOS 7 release)
009/095 …done (KDE Desktop Environment underwent several design modifications in CentOS 7 release)
010/095 …done (several graphic drivers not supported in CentOS 7)
011/095 …done (several input drivers not supported in CentOS 7)
012/095 …done (several kernel networking drivers not available in CentOS 7)
013/095 …done (several kernel storage drivers not available in CentOS 7)
014/095 …done (Names, Options and Output Format Changes in arptables)
015/095 …done (BIND9 running in a chroot environment check.)
016/095 …done (BIND9 configuration compatibility check)
017/095 …done (Move dhcpd/dhcprelay arguments from /etc/sysconfig/* to *.service files)
018/095 …done (DNSMASQ configuration compatibility check)
019/095 …done (Dovecot configuration compatibility check)
020/095 …done (Compatibility Between iptables and ip6tables)
021/095 …done (Net-SNMP check)
022/095 …done (Squid configuration compatibility check)
023/095 …done (Reusable Configuration Files)
024/095 …done (VCS repositories)
025/095 …done (Added and extended options for BIND9 configuration)
026/095 …done (Added options in DNSMASQ configuration)
027/095 …done (Packages not signed by CentOS)
028/095 …done (Obsoleted rpms)
029/095 …done (w3m not available in CentOS 7)
030/095 …done (report incompatibilities between CentOS 6 and 7 in qemu-guest-agent package)
031/095 …done (Removed options in coreutils binaries)
032/095 …done (Removed options in gawk binaries)
033/095 …done (Removed options in netstat binary)
034/095 …done (Removed options in quota tools)
035/095 …done (Removed rpms)
036/095 …done (Replaced rpms)
037/095 …done (GMP library incompatibilities)
038/095 …done (package downgrades)
039/095 …done (restore custom selinux configuration)
040/095 …done (General)
041/095 …done (samba shared directories selinux)
042/095 …done (CUPS Browsing/BrowsePoll configuration)
043/095 …done (CVS Package Split)
044/095 …done (FreeRADIUS Upgrade Verification)
045/095 …done (httpd configuration compatibility check)
046/095 …done (bind-dyndb-ldap)
047/095 …done (Identity Management Server compatibility check)
048/095 …done (IPA Server CA Verification)
049/095 …done (NTP configuration)
050/095 …done (Information on time-sync.target)
051/095 …done (OpenLDAP /etc/sysconfig and data compatibility)
052/095 …done (OpenSSH sshd_config migration content)
053/095 …done (OpenSSH sysconfig migration content)
054/095 …done (Configuration for quota_nld service)
055/095 …done (Disk quota netlink message daemon moved into quota-nld package)
056/095 …done (SSSD compatibility check)
057/095 …done (Luks encrypted partition)
058/095 …done (Clvmd and cmirrord daemon management.)
059/095 …done (State of LVM2 services.)
060/095 …done (device-mapper-multipath configuration compatibility check)
061/095 …done (Removal of scsi-target-utils)
062/095 …done (Configuration for warnquota tool)
063/095 …done (Disk quota tool warnquota moved into quota-warnquota package)
064/095 …done (Architecture Support)
065/095 …done (Binary rebuilds)
066/095 …done (Debuginfo packages)
067/095 …done (Cluster and High Availablility)
068/095 …done (fix krb5kdc config file)
069/095 …done (File Systems, Partitions and Mounts Configuration Review)
070/095 …done (Read Only FHS directories)
071/095 …done (Sonamebumped libs)
072/095 …done (SonameKept Reusable Dynamic Libraries)
073/095 …done (Removed .so libs)
074/095 …done (In-place Upgrade Requirements for the /usr/ Directory)
075/095 …done (CA certificate bundles modified)
076/095 …done (Developer Tool Set packages)
077/095 …done (Hyper-V)
078/095 …done (Content for enabling and disabling services based on CentOS 6 system)
079/095 …done (Check for ethernet interface naming)
080/095 …done (User modification in /etc/rc.local and /etc/rc.d/rc.local)
081/095 …done (cgroups configuration compatibility check)
082/095 …done (Plugable authentication modules (PAM))
083/095 …done (Foreign Perl modules)
084/095 …done (Python 2.7.5)
085/095 …done (Ruby 2.0.0)
086/095 …done (SCL collections)
087/095 …done (System kickstart)
088/095 …done (YUM)
089/095 …done (Check for usage of dangerous range of UID/GIDs)
090/095 …done (Incorrect usage of reserved UID/GIDs)
091/095 …done (NIS ypbind config files back-up)
092/095 …done (NIS Makefile back-up)
093/095 …done (NIS server maps check)
094/095 …done (NIS server MAXUID and MAXGID limits check)
095/095 …done (NIS server config file back-up)
Assessment finished (time 00:00s)
Result table with checks and their results for main contents:
————————————————————————————————————
|Configuration Files to Review |notapplicable |
|File Lists for Manual Migration |notapplicable |
|Bacula Backup Software |notapplicable |
|MySQL configuration |notapplicable |
|Migration of the MySQL data stack |notapplicable |
|General changes in default MySQL implementation |notapplicable |
|PostgreSQL upgrade content |notapplicable |
|GNOME Desktop Environment underwent several design modifications in CentOS 7 release |notapplicable |
|KDE Desktop Environment underwent several design modifications in CentOS 7 release |notapplicable |
|several graphic drivers not supported in CentOS 7 |notapplicable |
|several input drivers not supported in CentOS 7 |notapplicable |
|several kernel networking drivers not available in CentOS 7 |notapplicable |
|several kernel storage drivers not available in CentOS 7 |notapplicable |
|Names, Options and Output Format Changes in arptables |notapplicable |
|BIND9 running in a chroot environment check. |notapplicable |
|BIND9 configuration compatibility check |notapplicable |
|Move dhcpd/dhcprelay arguments from /etc/sysconfig/* to *.service files |notapplicable |
|DNSMASQ configuration compatibility check |notapplicable |
|Dovecot configuration compatibility check |notapplicable |
|Compatibility Between iptables and ip6tables |notapplicable |
|Net-SNMP check |notapplicable |
|Squid configuration compatibility check |notapplicable |
|Reusable Configuration Files |notapplicable |
|VCS repositories |notapplicable |
|Added and extended options for BIND9 configuration |notapplicable |
|Added options in DNSMASQ configuration |notapplicable |
|Packages not signed by CentOS |notapplicable |
|Obsoleted rpms |notapplicable |
|w3m not available in CentOS 7 |notapplicable |
|report incompatibilities between CentOS 6 and 7 in qemu-guest-agent package |notapplicable |
|Removed options in coreutils binaries |notapplicable |
|Removed options in gawk binaries |notapplicable |
|Removed options in netstat binary |notapplicable |
|Removed options in quota tools |notapplicable |
|Removed rpms |notapplicable |
|Replaced rpms |notapplicable |
|GMP library incompatibilities |notapplicable |
|package downgrades |notapplicable |
|restore custom selinux configuration |notapplicable |
|General |notapplicable |
|samba shared directories selinux |notapplicable |
|CUPS Browsing/BrowsePoll configuration |notapplicable |
|CVS Package Split |notapplicable |
|FreeRADIUS Upgrade Verification |notapplicable |
|httpd configuration compatibility check |notapplicable |
|bind-dyndb-ldap |notapplicable |
|Identity Management Server compatibility check |notapplicable |
|IPA Server CA Verification |notapplicable |
|NTP configuration |notapplicable |
|Information on time-sync.target |notapplicable |
|OpenLDAP /etc/sysconfig and data compatibility |notapplicable |
|OpenSSH sshd_config migration content |notapplicable |
|OpenSSH sysconfig migration content |notapplicable |
|Configuration for quota_nld service |notapplicable |
|Disk quota netlink message daemon moved into quota-nld package |notapplicable |
|SSSD compatibility check |notapplicable |
|Luks encrypted partition |notapplicable |
|Clvmd and cmirrord daemon management. |notapplicable |
|State of LVM2 services. |notapplicable |
|device-mapper-multipath configuration compatibility check |notapplicable |
|Removal of scsi-target-utils |notapplicable |
|Configuration for warnquota tool |notapplicable |
|Disk quota tool warnquota moved into quota-warnquota package |notapplicable |
|Architecture Support |notapplicable |
|Binary rebuilds |notapplicable |
|Debuginfo packages |notapplicable |
|Cluster and High Availablility |notapplicable |
|fix krb5kdc config file |notapplicable |
|File Systems, Partitions and Mounts Configuration Review |notapplicable |
|Read Only FHS directories |notapplicable |
|Sonamebumped libs |notapplicable |
|SonameKept Reusable Dynamic Libraries |notapplicable |
|Removed .so libs |notapplicable |
|In-place Upgrade Requirements for the /usr/ Directory |notapplicable |
|CA certificate bundles modified |notapplicable |
|Developer Tool Set packages |notapplicable |
|Hyper-V |notapplicable |
|Content for enabling and disabling services based on CentOS 6 system |notapplicable |
|Check for ethernet interface naming |notapplicable |
|User modification in /etc/rc.local and /etc/rc.d/rc.local |notapplicable |
|cgroups configuration compatibility check |notapplicable |
|Plugable authentication modules (PAM) |notapplicable |
|Foreign Perl modules |notapplicable |
|Python 2.7.5 |notapplicable |
|Ruby 2.0.0 |notapplicable |
|SCL collections |notapplicable |
|System kickstart |notapplicable |
|YUM |notapplicable |
|Check for usage of dangerous range of UID/GIDs |notapplicable |
|Incorrect usage of reserved UID/GIDs |notapplicable |
|NIS ypbind config files back-up |notapplicable |
|NIS Makefile back-up |notapplicable |
|NIS server maps check |notapplicable |
|NIS server MAXUID and MAXGID limits check |notapplicable |
|NIS server config file back-up |notapplicable |
————————————————————————————————————
Tarball with results is stored here /root/preupgrade-results/preupg_results-140731223457.tar.gz .
The latest assessment is stored in directory /root/preupgrade .
Upload results to UI by command:
e.g. preupg -u http://127.0.0.1:8099/submit/ -r /root/preupgrade-results/preupg_results-*.tar.gz .

[root@oracle ~]# rpm –import http://centos.excellmedia.net/7.0.1406/os/x86_64/RPM-GPG-KEY-CentOS-7

-bash: edhat-upgrade-tool: command not found
[root@oracle ~]# redhat-upgrade-tool –network 7.0 –instrepo http://centos.excellmedia.net/7.0.1406/os/x86_64/
setting up repos…
base | 3.6 kB 00:00
base/primary_db | 4.9 MB 00:22
cmdline-instrepo | 3.6 kB 00:00
cmdline-instrepo/primary_db | 4.9 MB 00:19
extras | 3.3 kB 00:00
extras/primary_db | 15 kB 00:00
ol6_UEK_latest | 1.2 kB 00:00
ol6_UEK_latest/primary | 15 MB 00:18
ol6_latest | 1.4 kB 00:00
ol6_latest/primary | 40 MB 00:28
updates | 3.4 kB 00:00
updates/primary_db | 2.1 MB 00:03
upgrade | 1.9 kB 00:00
upgrade/primary_db | 11 kB 00:00
.treeinfo | 1.1 kB 00:00
preupgrade-assistant has not been run.
To perform this upgrade, either run preupg or run redhat-upgrade-tool –force
[root@oracle ~]#

Re-run the redhat-upgrade-tool with the –force option (not recommended, but this is only solution as of now)
[root@oracle ~]# redhat-upgrade-tool –network 7.0 –force –instrepo http://centos.excellmedia.net/7.0.1
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
finding updates 100% [======================================================================================================================================================================================================================]redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
finding updates 100% [======================================================================================================================================================================================================================]redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
finding updates 100% [======================================================================================================================================================================================================================]redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
finding updates 100% [======================================================================================================================================================================================================================]redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
finding updates 100% [======================================================================================================================================================================================================================]redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package gnome-keyring-devel is obsoleted by gnome-keyring, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements
redhat_upgrade_tool.yum WARNING: Package db4 is obsoleted by libdb, but obsoleting package does not provide for requirements : zlib-devel-1.2.7-13.el7.x86_64.rpm | 49 kB 00:00
testing upgrade transaction
rpm transaction 100% [======================================================================================================================================================================================================================]
rpm install 100% [==========================================================================================================================================================================================================================]
setting up system for upgrade
Finished. Reboot to start upgrade.
[root@oracle ~]#

Now reboot the server.

# reboot

Upgrade toCentOS 7:

The server will boot with the redhat-upgrade-tool kernel to upgrade the CentOS 6, now you can find the up-gradation activity via console.

Upgrade toCentOS 7:

The server will boot with the redhat-upgrade-tool kernel to upgrade the CentOS 6, now you can find the up-gradation activity via console.

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Red Hat Enterprise Linux 6 to 7

Installing Redhat upgrade tool:

PreUpgrade Assistant:

Upgrade toCentOS 7:

Upgrade toCentOS 7:

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