Reading Time: 7 minutes
What Is Sudo?
Sudo is a Linux program meant to allow a user to use root privileges for a limited timeframe to users and log root activity. The basic thought is to give as few privileges as possible to a user while allowing the user to accomplish a task. The term “Sudo” means substitute user, and do. It is a program used for managing of user permission based on a system configuration file. It allows users to run programs with the privileges of another user, by default, the superuser. The program is supplied for most UNIX and Linux-based operating systems.
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Reading Time: 5 minutes
What is Grafana?
This article is a step-by-step guide on how to install Grafana software on CentOS 8 server. Grafana is a popular open-source visualization and analytics monitoring software. It renders graphs, charts, and alerts when connected to supported data sources. It is commonly used with time series databases like Prometheus, SQL databases like MySQL logging, and document databases like Loki, etc. You can additionally install hundreds of plugins and dashboards from the official library.
Reading Time: 10 minutes
Most Linux distributions ship with a command-line based text editor, usually Vi/Vim or Nano. While both are excellent choices, Vim has a steeper learning curve and can be confusing for beginners. Nano, on the other hand, will feel much more familiar to anyone who has used notepad or other simple text editors in a desktop or other graphical user interface. This is not to say that Nano is not as feature rich as Vim; it is simply more accessible.
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Reading Time: 6 minutes
What is SaltStack?
SaltStack is an open-source infrastructure management platform built on a dynamic communications bus. The main structure of SaltStack contains two main components for work: one Salt Master and several Salt Minions. Salt Master is the main control system used to send commands to Salt Minion and their configuration. Salt Minions (they are also called Nodes) are subsystems that work on managed servers and receive commands from the master, as well as their configuration. At least two servers are required for interaction settings. One for the Master and one for the node. All nodes are configured in the same way.
Continue reading “How to Install SaltStack on Ubuntu 18”
Reading Time: 4 minutes
What is Graylog Sidecar?
Graylog Sidecar is a nimble configuration management framework for various log collectors called backends. The Graylog master node acts as a centrally located hub that contains the configurations of the log collectors. Sidecar can run as a service on both Windows and Linux servers.
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Reading Time: 8 minutes
In this article we will learn what the Network Time protocol (NTP) is and how to install it on the two Linux distributions most commonly used on Liquid Web’s servers. We will be focusing on using CentOS 7 and Ubuntu 18.04 servers, but the process is largely the same on other recent versions of each. Before we start, make sure we are familiar with using SSH (Secure Shell) as we’ll need it to connect to the server. Here’s a link to one of our articles on the basics of SSH if you are unfamiliar with its usage.
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Reading Time: 10 minutes
What is Wraith?
Wraith is a visual regression testing tool which uses screenshot comparisons to assess visual differences in a website over time. It is currently hosted on GitHub and available under an Apache 2.0 open-source license.
Continue reading “How To Install and Configure Wraith”
Reading Time: 8 minutes
All online businesses need to account for growth. As a business receives more visitors to its site, the underlying infrastructure needs to scale to provide the same level of performance that the visitors are accustomed to. Horizontal scaling, the addition of more servers rather than increasing the power of the existing servers, is an easy way to build our web servers’ ability to handle a more significant amount of traffic and protect us against hardware failure. Ensuring that the additional web servers have the same files and data is a potentially time-consuming and challenging task. Automating that task using free, open-source software, such as lsyncd, is a way to ensure that we have a safe, secure, and repeatable method of copying files from one server to another.
Continue reading “How to Sync Two CentOS 8 Servers Using File Replication”
Reading Time: 3 minutes
This article outlines the process of configuring a Dedicated server for Python 3 web applications with Apache 2.4 using mod_wsgi.
What is mod_wsgi?
Mod_wsgi is an Apache module that allows Python web applications to function on a server. This module provides a web framework for Flask, Django, and other Python based frameworks to operate within a clustered server environment on a group of servers.
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Reading Time: < 1 minute
What is Flask?
Flask is a micro web framework for Python that allows unlimited possibilities to the structure and format for building powerful web applications. This article demonstrates how to get started with Flask using Python 3.7 inside of a virtual environment.
Continue reading “Getting Started With Flask”