Book Image

Ubuntu Server Essentials

By : Abdelmonam Kouka
Book Image

Ubuntu Server Essentials

By: Abdelmonam Kouka

Overview of this book

Ubuntu is a Debian-based Linux operating system built on top of the Debian architecture. It is used to make operating systems for multiple platforms, including phones, desktops, TVs and mobiles. It has made some serious progress in the realms of efficiency and user friendliness. With evolving technology trends, demands on software have changed, with more and more skilled users. Over the past few years, services such as Facebook, Twitter, and push notifications on smartphones mean that users are used to being up to date with everything that happens all the time. With SignalR, the applications stay connected and will generate notifications when something happens either from the system or by other users. This provides new opportunities for the system administrators, to enter this new and exciting world of real-time application development. This is a concise and a cost-friendly guide, packed with up-to-date essentials on Ubuntu Server fundamentals. It will guide you through deploying and configuring Ubuntu servers in your office environments. You’ll start by installing Ubuntu Server, then move to the most useful aspect —the command-line interface inside it. You’ll extend your knowledge by learning how to administrate and configure Ubuntu Server. You will also see how to deploy services on Ubuntu Server and find out how to secure it. You’ll get to grips with the virtualization and cloud computing facilities provided by Ubuntu, and finally, you’ll gain some very useful tips.
Table of Contents (13 chapters)

General tips

In this section, we will explore some useful tips and tricks for Ubuntu Server. These are general tips related to the command-line interface (CLI), package management, and the customization of configurations.

Ubuntu Server CLI tips and tricks

The following are some useful CLI commands:

  1. Get the reason behind installing a package, that is, check the reverse dependencies of the given package, by using the following command:

    apt-cache rdepends --installed [package_name]
    apt-cache rdepends --installed mysql-server
  2. List all the users along with their respective last login time by executing the following command:

  3. To change the server time zone, you need to run the following code:

    sudo dpkg-reconfigure tzdata

    Furthermore, to check whether the timezone has changed or not, you need to run the following command:

    less /etc/timezone

    Also, don't forget to restart cron so that it can pick up the timezone change, as follows:

    sudo service cron restart
  4. If you need to manually synchronize...