A wildcard certificate is a specific form of the certificate used in TLS/SSL instances. It is a single certificate with a wildcard character (*) in the domain name field. This allows the certificate to secure multiple subdomain names (hosts) pertaining…
PEM (originally “Privacy Enhanced Mail”) file was initially invented to make e-mail secure. Now it is an Internet security standard. PEM file is the most common format for X.509 certificates, CSRs, and cryptographic keys. What is a PEM file A…
There are two major encoding schemes for X.509 certificates and keys: PEM (Base64 ASCII), and DER (binary). We can’t always tell what kind of file we are working with just from looking at the filename; we may need to open…
A disk partition is a contiguous space of storage on a physical or logical disk that functions as if it were a physically separate disk. Partitions are visible to the system firmware and the installed operating systems. Access to a…
The first thing that we need to know is there is no C drive or E drive in Linux. We will see something like /dev/sda, /dev/sdb, /dev/sdc, … etc. instead. The dev is short for device. The sd was short…
This article is part of the following series. To check the disk size in Linux, you can use lsblk, fdisk, or parted commands. All these commands are available in most Linux distributions. They provide information about disk size, partition…
A block device is a storage device that moves data in sequences of bytes or bits (blocks). These devices support random access and generally use buffered I Examples include hard disks, CD-ROM drives, and flash drives. A block device can…
Amazon Simple Storage Service (Amazon S3) is a scalable, high-speed, web-based cloud storage service. The service is designed for online backup and archiving of data and applications on Amazon Web Services (AWS). Amazon S3 was designed with a minimal feature…
Amazon S3 (Simple Storage Service) is a scalable, high-speed, low-cost web-based service designed for online backup and archiving of data and application programs. It allows to upload, store, and download any type of files up to 5 TB in size.…
Amazon Virtual Private Cloud (VPC) is a service that lets us launch AWS resources in a logically isolated virtual network that we define. Amazon Virtual Private Cloud (Amazon VPC) enables us to launch Amazon Web Services resources into a virtual…
