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PostgreSQL: The World’s Most Advanced Open Source Relational Database PostgreSQL is arguably the most advance and powerful opensource enterprise class relational database system. It is the object relational database system and provides the most standard compliant system for the Database designers. It provides the complete support for reliable transactions that is (ACID complaint) where ACID stands for Atomicity, Consistency, Isolation and Durability. Its advance underlying technology makes it extremely powerful and programmable....

Grub 2 typically gets overridden when you install Windows or another Operating System. To make Linux control the boot process, you need Reinstall (Repair/Restore) Grub using a Linux Live CD. ROOT_DISK='/dev/sda2' BOOT_DISK='/dev/sda1' # optional, only for EFI DISK='/dev/sda' mount $ROOT_DISK /mnt mount $BOOT_DISK /mnt/boot/efi # optional for i in /dev /dev/pts /proc /sys /sys/firmware/efi/efivars /run; do sudo mount -B $i /mnt$i; done chroot /mnt grub-install $DISK update-grub``` note: don't forget to update UUID in /mnt/etc/fstab using blkid

You can restrict access to your website or some parts of it by implementing a username/password authentication. Usernames and passwords are taken from a file created and populated by a password file creation tool, for example, apache2-utils. Creating a Password File Create additional user-password pairs. Omit the -c flag because the file already exists Nginx configuration location /public/ { auth_basic off; } } Apache/httpd basic configuration <Directory "/var/www/html"> AuthType Basic AuthName "Restricted Content" AuthUserFile /etc/httpd/....

You can restrict access to certain parts of your website using Nginx’s inbuilt authentication and authorization mechanism based either on your client’s I.P, by prompting for a login prompt or both. A sample I.P. based authorization configuration would be like:

A reverse proxy is a server that sits between internal applications and external clients, forwarding client requests to the appropriate server. While many common applications, such as Node.js, are able to function as servers on their own, NGINX has a number of advanced load balancing, security, and acceleration features that most specialized applications lack. Using NGINX as a reverse proxy enables you to add these features to any application. Basic Configuration for an NGINX Reverse Proxy server_name example....