A VPN allows you to access the Internet safely and securely on an untrusted public Wi-Fi network. You can connect to remote VPN servers using the encrypted connection and surf the web anonymously.
strongSwan is free, open-source, and the most widely-used IPsec-based virtual private network implementation, allowing you to create an encrypted secure tunnel between two or more remote networks.
SCP stands for secure copy. It is a Linux command-line utility used to securely copy files and directories between servers. SCP uses the SSH protocol, so it requires a password or password less authentication between servers. With SCP, you can copy files between two remote hosts from your local system, as well as copy files between local and remote hosts.
In this tutorial, we will show you how to use the SCP command with examples.
MongoDB is a cross-platform NoSQL database system written in C++. MongoDB is different from traditional table-based SQL databases like MySQL and PostgreSQL and is specially designed for high-volume data storage. MongoDB uses JSON-like documents with dynamic schemas and does not require a predefined schema before you add data to a database. MongoDB is free, open-source, and comes with a rich set of features including, storage, data replication, Ad-hoc queries, load balancing, and many more.
In this tutorial, we will explain how to install and secure MongoDB on CentOS 8.
PostgreSQL is free, open-source, and one of the most popular relational database management systems, powering millions of applications. If you are a database administrator using PostgreSQL in a production environment, it is essential to back up your database so you can quickly restore your system if your database is lost.
Cron is a time-based job scheduling daemon in Linux-based operating systems. It is used to schedule specific tasks to run periodically at fixed times, dates, or intervals. It is very similar to the Windows task scheduling utility and is very useful for routine tasks including:
The cron daemon runs in the background and continuously checks the /etc/crontab file, and /etc/cron.*/ directories.
If you are a system administrator, copying files and directories is one of the most common tasks in your day-to-day work. The cp command is a basic Linux command used for copying files and directories from one location to another. By default, the cp command is available in almost all Unix- and Linux-like operating systems.
In this tutorial, we will show you how to use the cp command to copy files and directories in Linux.
SFTP stands for “SSH File Transfer Protocol.” SFTP is a file transfer protocol used to transfer files between two servers. By default, SFTP allows you to transfer files on all servers that have SSH access enabled. However, it will grant terminal access to all users and this is not recommended for security reasons.
In this tutorial, we will learn how to create an SFTP user without shell access so that the user has only SFTP access and not SSH access.
Node.js is an open-source, cross-platform, JavaScript runtime environment that can be used to run JavaScript outside the web browser. It is most commonly used to build web applications with real-time, two-way connections, where both the client and server can initiate communication, allowing them to exchange data freely. Node.js uses an event-driven, non-blocking I/O model that makes it perfect for data-intensive applications that run across distributed devices.
MySQL is an open-source relational database management system that is developed, distributed, and supported by Oracle Corporation. There are several web-based tools available for managing the MySQL server, but best practice is to use the native MySQL command-line client for performing day-to-day MySQL tasks. It does take some time to get familiar with a command-line interface, particularly if you don’t regularly work in a CLI environment.
In this tutorial, we will show you some MySQL command-line tips and tricks that help you to perform day-to-day tasks.
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