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Upgrade CentOS 6.8 from CentOS 6.7/6.6/6.5/6.4/6.3/6.2/6.1
Upgrade CentOS 6.8 from CentOS 6.7/6.6/6.5/6.4/6.3/6.2/6.1If you are using CentOS OS Older version 6.x release