Sendmail vs Postfix - both are Mail Transfer Agents (MTA) used for sending mail from a Linux host. The primary concerns when deciding which MTA to use come down to performance, ease of use, and security. Postfix is the most commonly used MTA, for good reason. It is a security oriented mail server … [Read more...] about Sendmail vs Postfix – Mail Transfer Agent Comparison
ssh ec2 instance – How to add an ssh key
The purpose of this article is to demonstrate how to add an ssh key to an existing ec2 instance. If you are reading this then you have likely created an ec2 instance but cannot access it remotely except through the AWS console. It's important to always have a way to ssh into your ec2 instances … [Read more...] about ssh ec2 instance – How to add an ssh key
Upgrade Ubuntu 18.04 to 20.04
This article will demonstrate how to upgrade Ubuntu 18.04 to 20.04. We recommend always staying up to date to the latest LTS (Long Term Support) version of Ubuntu and this article assumes the intermediary releases were skipped. As soon as a new LTS version is made available to you in your package … [Read more...] about Upgrade Ubuntu 18.04 to 20.04
Ubuntu Time Settings
This article will demonstrate how to manage Ubuntu time settings. The examples provided in this article were completed with Ubuntu 20.04.4 LTS, but should work for any recent version of Ubuntu. If not, leave us a comment and we will update accordingly. To check your version of Ubuntu, run the … [Read more...] about Ubuntu Time Settings
SSH Key Generation
The ssh-keygen utility is used for ssh key generation. This post will walk you through how to generate a new ssh key, configure its use, and use it for authentication against the hosts or systems you need to authenticate to. At the end we will walk through how to test ssh key and password … [Read more...] about SSH Key Generation
Vault PKI – How to run a CA with Hashicorp Vault
This article will demonstrate how to run a CA (Certification Authority) with Hashicorp Vault using the vault pki secrets engine. The examples provided will be in the form of a development environment using Docker. Before continuing it may be helpful to read our previous article on running vault in … [Read more...] about Vault PKI – How to run a CA with Hashicorp Vault
certbot apache ubuntu
This article will demonstrate how to automate the renewal of SSL certificates, specifically letsencrypt certificates, using the certbot utility with apache on an ubuntu OS. The examples in this article will work on Ubuntu 18.04 and greater. They may also work on previous version of Ubuntu but if … [Read more...] about certbot apache ubuntu
Perl DBI – Database connections with perl
What is Perl DBI? It is the Perl Database Interface which supports database programming with perl. As any good interface does, it provides a user facing set of methods and variables to make database connections and commands with. The interface hides the underlying details of the database being used, … [Read more...] about Perl DBI – Database connections with perl