David Cao

David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

Understanding PEM and DER File Formats

Understanding the differences between PEM and DER file formats is important for handling SSL/TLS certificates, as they are two of the most commonly used formats for storing these certificates and keys. Here’s an overview of each format: PEM Format DER…

4 ways to Check DNS Server in Ubuntu

Introduction When you browse the internet, you are actually accessing different websites by their domain names. However, your computer doesn’t understand domain names, so it needs to translate them into IP addresses.This is where Domain Name System (DNS) servers come…

3 Ways to get S3 bucket size in AWS

When it comes to Amazon Web Services (AWS), S3 is one of the most popular services. This is because S3 provides a secure and scalable storage solution for businesses of all sizes. In order to ensure that your S3 buckets…

How to convert pfx file to pem

A PFX file is a certificate in PKCS#12 format. It contains the SSL certificate (public keys) and the corresponding private keys. Most of the Certificate Authorities will not issue certificates with the private key. They just issue and share the…