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Bash scripting is an art form

Writing bash scripts involves many levels of mastery, and I’m still learning new syntax and tricks. It always amazes me how deep down the rabbit hole you can go with bash.

In this article, I want to share five tips that make bash checks a lot more powerful and make…


suppose you have 2 servers (server A, server B), each having their own local filesystems, with no shared NAS or SAN mounts

you need to monitor a set of files and directories on A and instantly sync any changes to B

the usual way to do this is to create…


FTP or rather sFTP (via SSH) is a reliable and time-tested method to send and receive files between 2 parties

At my company, whenever someone wants to FTP something to a client, or pull a file from a client, they write a quick bash script and are done.

If they…


For anyone that ever had to setup a secure sFTP server, you’ve undoubtedly had some pains setting up vsftpd service.

This article shows a very nice alternative that may make your life much easier.

vsftpd

Vsftpd is a well known “very secure FTP daemon” application and does its job well when…


written: Feb 1, 2021

This is a primer on how to setup Apache Airflow running on Centos 7 server for 2 separate environments (Prod and Simulation)

My company needed 2 separate envs, one for Production DAGs and one for Simulation/UAT DAGs.

Airflow can be a pain in the ass to…


this tutorial shows how to

  • setup Elasticsearch stack (ELK stack) on a server,
  • install Metricbeat, Filebeat and Auditbeat agents on an endpoint
  • install Elastalert plugin that will alert you on events

As a sysadmin I have a medium-sized infra environment (less than 200 servers, both physical and AWS instances), and…


At my work, I constantly have to do firewall testing between our hosts (our production network is managed by a vendor who also manages our physical production servers inside Equinix datacenters)

There are cases where we cannot connect within our network to certain ports, or certain port ranges

I’ve been…


During network connectivity troubleshooting, one thing that always pops up is the need to test connectivity for certain ports, for example, to check if a firewall is blocking a certain port,

I usually spin up a port on a server using either Netcat or Python, ie

while true ; do…

recently I had the misfortune of re-setting up a decomissioned Dell Powervault SAN unit in order to get restore some data on the disks that we urgently needed for production.

Dell Powervault is a nightmare to setup and manage compared to products from Synology, everything is overly complicated, documentation is horrendous and it took me over 3 days to figure out how to wire up and configure this thing in order to access data that was stored on the disk array

If you are in process of purchasing a NAS or SAN storage, please stay away from Powervault, its a disaster.

Hopefully this guide gives a few pointers to those unlucky enough to have to do this.

Full guide here:

https://sites.google.com/site/mrxpalmeiras/linux/powervault-md3200i-setup-on-centos-7


I’m always developing internal websites in our company, for example recently I deployed a Flask-based market data connection tracker on one of our Amazon EC2 hosts

The problem is whenever I access the site via browser, its HTTPS connection is always untrusted since the browser doesnt trust my company’s Certificate…

Mike R

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