How To Get A Reverse DNS Lookup On The Command Line

Author: , September 1st, 2021

There are three commands in Linux to easily get a reverse DNS lookup with: dig, host and nslookup. Here are examples of each: shell> dig -x 3.214.2.238 +short

shell> dig -x 3.214.2.238

shell> host 3.214.2.238

shell> nslookup 3.214.2.238

How To Fix aws Command Error “You must specify a region”

Author: , July 29th, 2021

I was getting error “You must specify a region” when running any aws CLI command. The fix: Using the aws command:

which will automatically add the following to the file ~/.aws/config:

You many simply edit the ~/.aws/config file yourself and append the same thing:

How To Preserve Line Breaks When Storing Command Output To A Shell Variable

Author: , July 14th, 2021

Solution: “Double Quote” your variables!

See Also: https://stackoverflow.com/questions/22101778/how-to-preserve-line-breaks-when-storing-command-output-to-a-variable

How To Fix “IOError: [Errno 10] No child processes” When Running the aws CLI Command from Perl WWW-REST-Apid

Author: , December 3rd, 2020

Problem While running the aws cli command from a Perl async command inside apid, I go the following error:

Solution The issue turned out to be a bug in Python2.7, so I upgraded to Python3.4, then uninstalled and re-installed the aws cli software so that it used the proper Python34 version. Procedure

https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html […]

How To Show the Origin in Git

Author: , January 30th, 2020

Recently, I wanted to see the “origin” of the git repository I was working in. The command is: git remote -v For example:

Zero-Downtime Cluster Maintenance: Comparing the Procedures for Upgrades versus DB/OS Maintenance

Author: , August 26th, 2019

Zero-Downtime Cluster Maintenance: Comparing the Procedures for Upgrades versus DB/OS Maintenance

How to move the Relay role to another node in a Composite Tungsten Cluster

Author: , July 25th, 2019

How to move the Relay role to another node in a Composite Tungsten Cluster

Slick Command-Line Tricks for a Tungsten MySQL / MariaDB Database Cluster

Author: , July 16th, 2019

Tungsten Clustering provides high availability, disaster recovery, and a host of other benefits for MySQL / MariaDB / Percona Server databases. In this blog post we will explore some of the shell aliases I use every day to administer various Tungsten Clusters.

How To Test Nagios Remote NRPE Commands

Author: , September 27th, 2018

There are many things to configure in Nagios, especially when using custom check commands. Recently I needed to configure all of the Continuent Clustering Nagios checks. Once setup on the database side, I wanted to confirm that everything was working. Basics: Run a Remote NRPE Check To test a remote NRPE client command from a […]

How To get haproxy status via socket using cli

Author: , October 6th, 2017

echo “show stat” | nc -U /var/lib/haproxy/stats | cut -d “,” -f 1,2,5-11,18,24,27,30,36,50,37,56,57,62 | column -s, -t