How to reset mysql root password.

Ping is the most commonly-used tool for simply troubleshooting network connectivity.

How to enable snmpd on RHEL linux for performance data monitoring via SNMP.

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Mac network traffic command line monitoring tool nettop.

In testng.xml, the "verbose" attribute of the suite tag is very useful for troubleshooting configuration related error. Its values can be set as 1 to 10, and smaller value means lower verbose and bigger value means higher verbose.

Elasticsearch python client and sample code for indices creation and deletion, document indexing, and searching. For elasticsearch installation, see post elk-getting-started-notes.

PEP8 (Python Enhancement Proposal 8) is the style guide for python coding and this post lists some of the important rules that should be followed.

SQL functions.

SQL basics.