We will show you how to enable and disable root login in Ubuntu. Root access it required when you need to perform administrative operations which are not permitted for the regular system users, but in the same time the root access may be a huge security risk if it is enabled or if it is not used properly. In this tutorial we will show you how to enable and disable root login on a Linux VPS running Ubuntu as an operating system.
When testing a website for performance using popular online tools like GTMetrix, Pingdom, Google PageSpeed, sometime we might get “Parallelize Downloads Across Hostnames” warning. This warning means that your website’s assets are delivered from the same host name, and it would slower the site’s speed.
There is a limitation on the number of concurrent connection that web browsers will make to a host. For HTTP/1 and HTTP/1.1 connections, a web browser is only able to download one file at a time.
In this article, we are going to show you how to install GitLab on CentOS 7. GitLab is Rails-based open source repository manager developed by GitLab Inc. GitLab is very useful for teamwork because is web-based git repository manager and it’s easy to deploy, code or test applications. It supports functions such as code reviews, issue tracking and activity feeds and that’s just a few of the features this application has. GitLab comes in Community Edition (self-hosted and free) and Enterprise Edition (self-hosted and paid).
We’ll show you how to automate shell scripts with expect command. The “Expect” name comes from the concept of sending/waiting for sequences popular by uucp, kermit and various modem management programs. However, not like uucp, Expect is generalized so it can be executed as a user-level command with any program and task in mind. Expect can communicate with multiple programs at the same time. In other words the Expect is a program that talks to a variety of interactive programs according to the script.
When testing a website to check it’s speed score and load time using the popular tools such as Gtmetrix, Pingdom and Google Page Speed, sometime we will get a low score in “Remove Query Strings from Static Resources”. URLs which contain special characters such as question marks (? ) and ampersand (&) are treated as Query Strings. Some proxy caching servers cannot cache the resources with special character in the URL, like : http://yoursite.com/wp-content/themes/yourtheme/css/style.css?ver=1.1.1.
In this post, we will discuss ‘sudo’ command and we will show you sudo command examples. The sudo command is one of the most important and commonly used command in Linux. It is very important that the Linux user understand sudo command to increase security and prevent unexpected things, that the user have to go through. In the most of the Linux operating system, sudo (“superuser do”, “switch user do”) permits a user with proper permissions to execute a command as another user, like the superuser. Basically, the sudo command allows a permitted user to execute a command as the superuser or another user such as modify important system configuration files, remove packages, create users and groups, install and update.
On the other hand, the system administrator can share the root password (which is not the recommended method), so that normal users of the system can access the root account via the sudo command. The behavior of the sudo command is controlled by the /etc/sudoers file on your system.
If you want to install Java on a VPS running CentOS 7 then this is the right tutorial for you. You will also be able to learn how to set a Java home variable and overview some basic management steps to get you started. As we already know Java is at the top of the list of the programming languages and this is worldwide. This programming language is created to have very little dependencies and that allows application developers to “write once, run everywhere”. As a matter of fact, any platform that supports Java can be operated by a compiled Java code. It can also be used to build both simple web applications and advanced software.
OpenJDK and Oracle Java are the two different implementations of Java. These two implementations of Java are based on the same code, but the main difference is that the reference implementation of Java or Open JDK is entirely open source, while on the other hand, Oracle Java contains some proprietary code.
In this article, we will show you how to install and configure Redis on a Debian VPS. Redis is an open source, in-memory data structure store with support for disk persistency. It is a key-value distributed database that supports data structures such as Strings, Lists, Sets, Sorted Sets, Hashes, HyperLogLogs, Bitmaps.
The Redis package that comes with Debian repo is quite outdated and contains a lot of security vulnerabilities. In this guide, we will install Redis from the source. At the time of this writing, the latest stable version of Redis is 4.0.8. Installing Redis on Debian 9 is fairly easy task, if you carefully follow the steps in the tutorial below. Let’s get started with the installation.
Git is a free and open source distributed version control system, originally developed in 2005 by Linus Torvalds, the great creator of the Linux operating system kernel. In this tutorial, we will show you how to install GIt on Ubuntu 16.04 and discuss how Git can help improve your development workflow.
Apache Maven is a java based software for project management and comprehension tool developed by Apache Foundation. Based on the concept of a project object model (POM), Maven can manage an entire project’s build. With Maven you can easily store documents, generate reports and documentation from a central piece of information. Installing Maven on Debian 9, is fairly easy task if you follow the steps bellow carefully and should not take more then 10 minutes.