Linux/CentOS 6

NTFS
yum --enablerepo=extras install epel-release yum install ntfs-3g yum install ntfsprogs
 * 1)  rpm -ivh http://mirror.chpc.utah.edu/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

ref:

Java
yum -y install java-1.8.0-openjdk
 * 1) For RHEL

Upgrade to CentOS 7
WARNING: DO NOT USE this tool. Warning: use of this tool is currently BROKEN as several system-critical packages are of a higher version number in CentOS 6.7 than they are in CentOS 7 so those do not get upgraded correctly. This renders yum and several other system tools non-functional.

Also: CentOS 6.6 fails now with the upgrade with error "Downloading failed: invalid data in .treeinfo: No section: 'checksums'" so this is also broken on CentOS 6.6 now and can ONLY be done on CentOS 6.5.

Install pre-upgrade assistant: $ sudo yum install preupgrade-assistant preupgrade-assistant-contents

Install upgrade tool: $ sudo yum install redhat-upgrade-tool

List upgrade options: $ sudo preupg -l CentOS6_7

Check upgrade: $ sudo preupg $ sudo preupg -s CentOS6_7

Fix issues.

Import CentOS-7 RPM key: $ sudo rpm --import http://mirror.centos.org/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

Do upgrade: $ sudo /usr/bin/redhat-upgrade-tool-cli --network 7 --instrepo=http://mirror.centos.org/centos/7/os/x86_64

ref:
 * TipsAndTricks/CentOSUpgradeTool - CentOS Wiki - https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool
 * CentOS 7: Upgrading from CentOS 6.x In Place - Linux Academy Blog - https://linuxacademy.com/blog/linux/centos-7-upgrading-from-centos-6-x-in-place/

Upgrade Issues
I/O warning : failed to load external entity "/usr/share/openscap/xsl/security-guide.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 40 element import xsl:import : unable to load /usr/share/openscap/xsl/security-guide.xsl I/O warning : failed to load external entity "/usr/share/openscap/xsl/oval-report.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 41 element import xsl:import : unable to load /usr/share/openscap/xsl/oval-report.xsl I/O warning : failed to load external entity "/usr/share/openscap/xsl/sce-report.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 42 element import xsl:import : unable to load /usr/share/openscap/xsl/sce-report.xsl OpenSCAP Error:: Could not parse XSLT file '/usr/share/preupgrade/xsl/preup.xsl' [oscapxml.c:416] Unable to open file /root/preupgrade/result.html Usage: preupg [options]

preupg: error: [Errno 2] No such file or directory: '/root/preupgrade/result.html'

https://centos.org/forums/viewtopic.php?t=59763

Erase the existing version of openscap (I had openscap 1.2) and install openscap-1.0.8-1.0.1 from http://dev.centos.org/centos/6/upg and redo the upgrade.

yum erase openscap yum install http://dev.centos.org/centos/6/upg/x86_64/Packages/openscap-1.0.8-1.0.1.el6.centos.x86_64.rpm yum install redhat-upgrade-tool preupgrade-assistant-contents

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Downloading failed: invalid data in treeinfo: No option 'upgrade' in section: 'images-x86_64'

According to the CentOS Upgrade Tool web page, the tool is currently broken:

https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool

Therefore the choices are to stay with CentOS 6 (supported till 2020), or backup all your data and do a clean CentOS 7 install then restore your data.