Check DNS A Record with Examples
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…
Category DevOps
Best and Fastest DNS Servers in 2023
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,…
10 Useful Examples of Openssl S_client Command
The OpenSSL s_client command is a helpful test client for troubleshooting remote SSL or TLS connections. This post covers various examples of testing SSL connections with different ciphers, TLS versions, and SSL server certificate analysis. OpenSSL s_client connect openssl s_client…
How to Fix Unable to get Local Issuer Certificate
“Unable to get Local Issuer Certificate” is a common SSL certificate error. It is related to the incomplete certificate chain such as (most commonly) missing the intermediate certificate or missing the root certificate authority (CA) certificate in its trusted certificate…
what is an epic in jira?
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…
Check SSL Certificate Chain with OpenSSL Examples
certificate chain is an ordered list of certificates, containing an SSL/TLS Certificate and Certificate Authority (CA) Certificates, that enable the receiver to verify that the sender and all CA’s are trustworthy. The chain or path begins with the SSL/TLS certificate,…
Exploring Tcpdump Filters with Examples
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…
Convert CER CRT DER PEM PFX Certificate with Openssl
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…
6 ways to Find Files By Name in Linux
The best way to find files by name in Linux is using the find command with the “-name” option. This command will search through the directories for files that have the specific word in their name. This can be very…
4 ways to Search Text in Files with Grep Command in Linux
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…