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.

layout_weight is used in LinearLayouts to assign “importance” to Views within the layout. All Views have a default layout_weight of zero, meaning they take up only as much room on the screen as they need to be displayed. Assigning a value higher than zero will split up the rest of the available space in the parent View, according to the value of each View’s layout_weight and its ratio to the overall layout_weight specified in the current layout for this and other View elements.

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.

Getting started notes on ELK (Elasticsearch, Logstash, Kibana).