February 2020 - Page 55 of 64

How To Set Up Apache Virtual Hosts on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Set Up Apache Virtual Hosts on Ubuntu 16.04

  • February 5, 2020
  • Linux
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The Apache web server is the most popular way to serve web content on the internet. Apache has the ability to serve multiple domains from a single server by using a mechanism called “virtual hosts”. If a virtual host is configured correctly for each domain, the web server can correctly route traffic to the appropriate files based on the domain name requested. In this guide, we’ll demonstrate how to configure Apache virtual hosts on an Ubuntu 16.04 server.

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Ubuntu 14.04 — freeimage — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — freeimage — multiple vulnerabilities (6 CVEs) — patch and remediation guide

  • February 5, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6586-1 Related CVEs: CVE-2019-12211 CVE-2019-12213 CVE-2020-21427 CVE-2020-21428 CVE-2020-22524 CVE-2016-5684 Upstream summary: It was discovered that FreeImage incorrectly handled certain memory operations. If a user were tricked into opening a crafted […]

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How To Install Elasticsearch 1.7, Logstash 1.5, and Kibana 4.1 (ELK Stack) on CentOS 7 — step-by-step Linux tutorial on Progressive Robot

How To Install Elasticsearch 1.7, Logstash 1.5, and Kibana 4.1 (ELK Stack) on CentOS 7

  • February 5, 2020
  • Linux
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In this tutorial, we will go over the installation of the Elasticsearch ELK Stack on CentOS 7—that is, Elasticsearch 1.7.3, Logstash 1.5.4, and Kibana 4.1.1. We will also show you how to configure it to gather and visualize the syslogs of your systems in a centralized location. Logstash is an open source tool for collecting, parsing, and storing logs for future use. Kibana is a web interface that can be used to search and view the logs that Logstash has indexed.

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Ubuntu 14.04 — python-urllib3 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — python-urllib3 — vulnerability — patch and remediation guide

  • February 5, 2020
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-3990-2 Related CVEs: CVE-2019-11236 Upstream summary: USN-3990-1 fixed a vulnerability in urllib3. This update provides the corresponding update for Ubuntu 14.04 ESM. Original advisory details: It was discovered that urllib3 […]

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How to Configure Mandatory Access Control with SELinux Policies on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Mandatory Access Control with SELinux Policies on RHEL 9

  • February 5, 2020
  • Linux
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SELinux (Security-Enhanced Linux) enforces Mandatory Access Control (MAC) on RHEL 9, confining processes to only the resources they are explicitly permitted to access regardless of traditional Unix file permissions. While RHEL ships with comprehensive base policies, custom applications often generate AVC (Access Vector Cache) denials because their access patterns are not covered by existing policy […]

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An Introduction to Useful Bash Aliases and Functions — step-by-step Linux tutorial on Progressive Robot

An Introduction to Useful Bash Aliases and Functions

  • February 5, 2020
  • Linux
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The more time you spend on the Linux command line, the more you will begin to realize that you tend to use the same commands, parameters, and sequences repeatedly. Luckily, bash allows you to create aliases and and bash functions to help reduce typing and accomplish complex, repeated tasks quickly and efficiently. In this guide, we’ll discuss the general syntax and go over some helpful examples.

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Oracle Linux 8 — maven:3.5 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — maven:3.5 — vulnerability — patch and remediation guide (ELSA-2022-1861)

  • February 5, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-1861 Related CVEs: CVE-2020-13956 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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How to Construct While Loops in Python 3: Complete Guide (2025–2026)

How to Construct While Loops in Python 3: Complete Guide (2025–2026)

Learning how to construct while loops in Python 3 is one of the most essential and frequently used skills in programming — while loops let your program repeat code as long as a condition is True, making them perfect for user input validation, games, menus, waiting for events, processing data until done, and automating repetitive tasks without knowing the exact number of iterations in advance.

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