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How To Upgrade CentOS 6 to CentOS 7 – Vultr.com
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Source: How To Upgrade CentOS 6 to CentOS 7 – Vultr.com
Git bash in IntelliJ IDEA 13 on Windows ~ Codeleak.pl [Docker] How-To
For RHEL :
https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.4/html/installation_guide/rhel6_to_rhel7