Category DevOps

DNS A record maps a domain name to the IP address (Version 4) of the server hosting the domain. The “A” stands for “address”. DNS A record indicates the IP address of a given domain. DNS A record is the…

A DNS, or Domain Name Server, is what helps translate human-friendly URLs into computer-friendly IP addresses. This is what enables our devices to connect to the internet and access the content we want to see. When people change their DNS,…

When a TLS connection fails, the error you get from a browser, curl, or a Java application is usually vague. “Handshake failed.” “Certificate not trusted.” “Connection reset.” openssl s_client is how you find out what is actually going on. It connects to…

An epic is often a larger user story that is broken down into smaller stories in order to be worked on. The important thing to note about epics is that they aren’t just an agile tool. Teams of all work…

Let’s dive into the fascinating world of tcpdump! It’s a command-line packet analyzer that allows you to capture and inspect network traffic. Think of it as a microscope for your network. We’ll break down how to use its filtering capabilities…

SSL certificates can have a variety of file extension types. There are a few simple OpenSSL commands that will correctly change the file format easily. We’ll walk you through the process in OpenSSL to convert a certificate to PEM. x.509…

Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. When it finds a match, it prints the line with the result. The grep command is handy when searching through…