March 16, 2022 Background OpenVPN is a wonderful VPN package — I’ve been running an ec2 micro instance with OpenVPN for my company for 2 years during the pandemic, and its been rock-solid, serving VPN tunnels for over 60 users. The way users currently authenticate is using a client-based .ovpn profile…

if you have an active slack channel in your organization and want to delete all messages from it, as of this writing (Feb 2022) there is no way to do this via native Slack settings or tools To delete these messages, you can run Slack-Cleaner2 step 1 — create Python virtualenv (here I use Pipenv, but can also use regular virtualenv) mkdir ~/slack cd ~/slack pipenv install slack-cleaner2…

August 2022 — Update: I have now ported this code to a compiled binary, same concept but the rsync is now done via a Crystal-based binary called “poni”, it uses iNotify C binding to detect changes and start rsync, see more here: GitHub - perfecto25/poni: file sync based on inotify events Based on INotify lib from https://github.com/Dlacreme/spy/blob/master/src/watcher.cr Poni is an INotify rsync daemon…github.com

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…