PUB:20140926 How To Reset Root Password On CentOS 7

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Merge pull request #1782 from runningwater/master

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Merge pull request #1783 from shaohaolin/master

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[Translating] How to monitor server memory usage with Nagios Remote Plugin Executor (NRPE)
Merge pull request #1784 from geekpi/master

[Translating] How to monitor server memory usage with Nagios Remote Plug...
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[Translated] How to monitor server memory usage with Nagios Remote Plugin Executor (NRPE)
Merge pull request #1786 from geekpi/master

[Translated] How to monitor server memory usage with Nagios Remote Plugi...
Merge pull request #1785 from shaohaolin/master

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